21. DOUBLE STARS History of double star studies at the Royal Observatory Why do we study double stars ? Types of binary stars The CCD technique and double stars http://www.astro.oma.be/D2/DSTARS/

Royal Observatory of Belgium (Brussels) Welcome to the world of double and multiple stars. Are you interested in the Universe ? Stars ? Double Stars ? Have a look here This page aims at giving you some basic information on double stars, on new observational techniques used to study these (e.g CCD) and shows results for some double stars obtained by the succesful HIPPARCOS space mission. We hope to raise in you a lot of questions about the Universe in general and double stars in particular. Happy travel through the world of double stars History of double star studies at the Royal Observatory Why do we study double stars ? Types of binary stars The CCD technique and double stars ... After the Hipparcos mission List of publications (via ADS) Selected publications: "CCD Photometry and Astrometry for Visual Double and Multiple Stars of the HIPPARCOS Catalogue. I. " compressed PS (gzip, 85 Kb) ''CCD Photometry and Astrometry for Visual Double and Multiple Stars of the HIPPARCOS Catalogue. III. " compressed PS (gzip, 141 Kb)

22. Binary Stars | Binary Stars News, Research And Current Events Brightsurf binary stars news and binary stars current events, research and discoveries. http://www.brightsurf.com/search/r-a/Binary_Stars/1/Binary_Stars_news.html

Brightsurf Science News Latest science news and current events. RSS Top Science News Most viewed science news and current science event articles this week. RSS Add Brightsurf Science News to your Web Site Science Resources Earth Science Space Science Life Science Fields of Scientific Study ... Nanotechnology Articles Science RSS News Feeds Earth, Life and Space Science RSS News Feeds. Earth Science RSS News Space Science RSS News Life Science RSS News Fields of Scientific Study RSS ... Next Sort By: Page Views Date Record: fastest flashing star Dutch researcher Steve van Straaten set a record during his doctoral research. The researcher registered the fastest ever change in the X-ray emission originating from a binary star. The record-breaking binary star consists of a neutron star and a lighter companion star. Astronomer Steve van... view more Mystery of Quintuplet stars in Milky Way solved For the first time, scientists have identified the cluster of Quintuplet stars in the Milky Way's galactic center, next to the super massive black hole, as massive binary stars nearing the end of their life cycle, solving a mystery that had dogged astronomers for more than 15 years. view more Evidence mounts for sun's companion star he Binary Research Institute (BRI) has found that orbital characteristics of the recently discovered planetoid, "Sedna", demonstrate the possibility that our sun might be part of a binary star system.

23. IAU Commission 42 Organization based in Hungary that studies binary stars. http://www.konkoly.hu/IAUC42/

INTERNATIONAL ASTRONOMICAL UNION COMMISSION 42. CLOSE BINARY STARS (ETOILES BINARIES SERREES) Together with Commission 27: Variable Stars , Commission 42 is part of Division V: Variable Stars of the International Astronomical Union Announcement The Web page of Commission 42 is valid for the term 2006 to 2009 and maintained by Andras Holl at Konkoly Observatory , Hungary. Last change made on Wed Jan 10 13:43:26 MET 2007 .

24. Simulation Of Binary Star Orbits From The Hipparcos Catalog Once it loads, this applet will display a system of binary stars orbiting one another. Select a system from the menu labelled Binary Systems , http://www.amherst.edu/~gsgreenstein/astro/Binary.html

Please be patient while the applet loads into your browser. Once it loads, this applet will display a system of binary stars orbiting one another. Select a system from the menu labelled "Binary Systems", and the simulation will begin. You'll see a white window with one red dot and one blue dot. Clicking within this window will display the coordinates in Astronomical Units (AU). In the window labelled "Position and Time Data", the elapsed time (in years) and positions (x and y in AU) for stars A and B are constantly updating. Please click on the icon (looks like an x or a /) in the upper right corner of the "stars" window before selecting a second system only one should be running at a time.

25. Village Voice > Music > David Byrne, Grown Backwards; Caetano Veloso, A Foreign binary stars. Sensually syncopative Brazilian and American alter egos do their part for global warming. by Carol Cooper. April 26th, 2004 830 PM http://www.villagevoice.com/issues/0417/cooper.php

News NYC Life Eats Music ... Eat for Victory 2:37 pm La Daily Musto 2:00 pm Sound of the City 10:45 am 10:23 am Threadster 9:32 am Bush Beat 9:03 am Wednesday All City Tuesday more blogs La Dolce Musto The absolutely last word on words not to have lived by during the Status Ain't Hood Four Reasons Why 2008 Will Rule Cover Story On the Taco Trail Top 25 Albums of 2007 Northern Chinese Dipping Paradise in Flushing by Robert Sietsema best of nyc eats drinks shopping ... Jesse James Enter to win a Jesse James DVD! Jalopy Enter to Win a Free $225 Series of Music Classes at Jalopy! Crunch Gym Membership Enter to win a 6-month membership to Crunch! Reverend Billy Enter To Win Tickets To See Reverend Billy's Hot + Holy Highline Revival! Music write to the editor email a friend print article comment Binary Stars Sensually syncopative Brazilian and American alter egos do their part for global warming by Carol Cooper April 26th, 2004 8:30 PM David Byrne Grown Backwards Nonesuch Caetano Veloso A Foreign Sound Nonesuch more music most popular most commented Cat Power: Depressed, Not Transcendent Reviews by Garrett Kamps Chatting with Stephin Merritt by Rob Trucks The Battle of Land and Sea's The Battle of Land and Sea by Werner Trieschmann Soul Summit by Richard Torres Ladysmith Black Mambazo's Ilembe: Honoring Shaka Zulu by Ernest Barteldes Michael Alan's Draw-A-Thon (NSFW) by Rebecca Smeyne I'm a Zoophile: When My Head Turns on the Street, It's Never at the Person Holding the Leash

26. AAVSO: Eclipsing Binary Observing Program Algol (Beta Persei) is the prototype of eclipsing binary stars and has a period of about 2.87 days. ImageThis is a PSPC image of a portion of the Perseus http://www.aavso.org/observing/programs/eb/

AAVSO HOME observing programs eclipsing binary Observing Observing Programs Visual CCD Exoplanet Transit Search ... Charts Main sections of web The AAVSO Variable Stars Observing Access Data ... Education/HOA Pick a star Create a light curve Recent Observations Find charts VSX Eclipsing Binary Observing Program For more information contact Committee Chairperson Gerry Samolyk ( samolyk@ix.netcom.com Algol (Beta Persei) is the prototype of eclipsing binary stars and has a period of about 2.87 days. Image:This is a PSPC image of a portion of the Perseus region of the sky. The image was taken by the ROSAT spacecraft and is courtesy of the Max Planck Institute. To the right is an AAVSO light curve based on the observations made and submitted by John Isles. One of the keys to successful observation of EB stars for the purpose of timing their minima is planning. When one of these stars enters its eclipse phase it will not wait for you to iron out the details you may have overlooked or failed to attend to earlier. A 20 or 30 minute delay to search for a misplaced chart or to locate the star field in an unfamiliar portion of the sky can mean loss of the evening's work. First, the observer must determine what stars he should attempt to observe. His choice of stars should certainly be within the limitations of his instrument and at a declination easily reached from his latitude. Duration of the eclipse may also be a limiting factor. Information about eclipsing binaries, including maximum and minimum brightness, period, eclipse duration, position and other related elements can be found in several publications including the General Catalog of Variable Stars. Charts for eclipsing binaries can be obtained from Gerry Samolyk, 9504 W. Barnard Ave., Greenfield, WI 53228. An ephemeris for AAVSO program stars is available from the AAVSO Headquarters, 25 Birch Street, Cambridge, MA 02138.

27. Binary Stars binary stars are particularly important, since sometimes they allow to measure the mass of the components, by analyzing the relative orbital parameters and http://www.pd.astro.it/E-MOSTRA/NEW/A3042DOP.HTM

BINARY STARS One could think that stars are isolated celestial bodies, just like the Sun. Actually, two thirds of the stars are gathered into multiple systems. Most of them are binary systems (that is formed by two stars alone, like Sirius), but there exist systems formed by three, four and even six stars. These stars rotate around a common point, which is the baricenter of the system, each one describing an elliptical orbit. One focus of the ellipse coincides with the baricenter. In a binary system, the two stars move around the common baricenter, O. The ratio between their distances from the baricenter is inversely proportional to the ratio between their masses. One should not mistake physical binaries with optical doubles, that is those stars that are close to each other due to just a perspective effect (for example, Mizar and Alcor, the stars of the "tail" in Ursa Major). There are several different types of binary systems. Visual binaries are those systems where both components can be recognized with a telescope. The resolving power of telescopes is limited, so not all binary systems can be visually distinguished. However, the presence of two rotating stars can be revealed also in an indirect way. This is the case of

28. Binary Stars "Flare" With Predictable Cycles Astronomers have completed a 5year campaign to monitor continuously radio flares from two groups of binary star systems. This survey is of special interest http://www.nrao.edu/pr/2002/algol/

document.write(dayNames[day] + ", " + monthNames[month] + " "); document.write(date + ", " + year ); document.write(" "); NRAO Home Press Releases Print Friendly Version June 3, 2002 Contact: Charles E. Blue, Public Information Officer cblue@nrao.edu Binary Stars "Flare" With Predictable Cycles, Analysis of Radio Observations Reveals Astronomers have completed a 5-year campaign to monitor continuously radio flares from two groups of binary star systems. This survey is of special interest because it provides evidence that certain binary star systems have predictable activity cycles like our Sun. The survey, which ran from January 1995 to October 2000, was conducted with the National Science Foundation's (NSF) Green Bank Interferometer. The report was presented at the American Astronomical Society (AAS) meeting in Albuquerque, New Mexico, by Mercedes Richards of the University of Virginia, and her collaborators Elizabeth Waltman of the Naval Research Laboratory, and Frank Ghigo of the National Radio Astronomy Observatory (NRAO). "This long-term survey was critical to our understanding of the short- and long-term magnetic cycles of these intriguing star systems," said Richards.

29. Orbits For Inner Planets Of Binary Stars What stable orbits are possible around binary stars? I poked at the problem some and found a couple interesting stable orbits. http://www.burtleburtle.net/bob/physics/binary.html

Orbits for Inner Planets of Binary Stars What stable orbits are possible around binary stars? I poked at the problem some and found a couple interesting stable orbits. This was started by the question on sci.astro, is it possible for a planet to be in a stable figure-8 orbit around the two stars in a binary system? As near as I can tell, the answer is no. But there are some interesting orbits to be had. I arbitrarily chose to work with a system with circular orbits and one star 4x heavier than the other. I think any weight ratio would have yielded the same types of orbits. I suspect having slightly elliptical orbits wouldn't make too much of a difference either, but I haven't checked. Click on images to start them moving, or to stop them. Dragging changes viewpoint. It helps your CPU if you only have one running at a time. First, for reference, this is what a typical trajectory through a binary star system looks like. Stable orbits are few and far between. This is an inner planet (white) making three orbits per star system orbit. The star system is circular, with one star 4x the weight of the other. The 3::1 resonance again, except displayed once per orbit of the star system. The stars will have gone around once, the planet will have gone around twice, and they should all be in the same position every time. It's a strobe effect. The planet has been given nonnegligible mass and slight errors in the starting position, so it should wander a bit. The numbers in the corner count star system orbits (years) and show fractional energy misplaced by the simulation. See, it's stable.

30. SPACE.com -- Detecting Other Worlds: Timing Eclipsing Binary Stars Or The 'Do-Si In my last article I discussed eclipsing binary stars; a configuration of two (generally close) stars that happen to orbit each other along our line of http://www.space.com/searchforlife/seti_doyle_worlds_011011.html

advertisement Detecting Other Worlds: Timing Eclipsing Binary Stars or The 'Do-Si-Do' Method By Laurance R. Doyle SETI Institute posted: 07:00 am ET 11 October 2001 In my last article I discussed eclipsing binary stars; a configuration of two (generally close) stars that happen to orbit each other along our line of sight, thereby eclipsing each other every orbital period. The most successful way of finding planets to datethe radial velocity or "wobble" methodrequires single stars since it detects the very slight offset motion of the star caused by the giant planet orbiting it. As discussed in my last article, the photometric transit method can be used to detect planets that cross two stars (the planet orbits both stars). These transits are more complex since they involve two stars orbiting each other while the planet crosses in front. The general rule for planetary stability in two-star systems is that the axis ratios should be greater than 3-to-1. This means that if two stars that orbit each other are fairly far apart, a planet could orbit one or the other at a distance of less than one-third their separation. (This is the configuration of the giant planet that orbits 16 Cygni B, the lesser bright of the 16 Cygni double star system.) On the other hand, if the two stars are very close (usually the case for eclipsing binaries) then a planet can stably orbit both, provided its orbit is at least 3 times the two stars' mutual separation. It is this latter configuration that allows the detection of outer giant planets using the eclipsing binary timing method.

31. Vast Cloud Of Antimatter Traced To Binary Stars Greenbelt, MD (SPX) Jan 10, 2008 Four years of observations from the European Space Agency s Integral (INTErnational Gamma-Ray Astrophysics Laboratory) http://www.spacedaily.com/reports/Vast_Cloud_Of_Antimatter_Traced_To_Binary_Star

SPACE DAILY SPACE WAR TERRA DAILY MARS DAILY ... ENERGY DAILY Get Our Free Newsletters Via Email Search All Our Sites at SpaceBank STELLAR CHEMISTRY Vast Cloud Of Antimatter Traced To Binary Stars Integral mapped the glow of 511 keV gamma rays from electron-positron annihilation. The map shows the whole sky, with the galactic center in the middle. The emission extends to the right. Click image for enlargement. Credit: ESA/Integral/MPE/G. Weidenspointner by Staff Writers Greenbelt, MD (SPX) Jan 10, 2008 Four years of observations from the European Space Agency's Integral (INTErnational Gamma-Ray Astrophysics Laboratory) satellite may have cleared up one of the most vexing mysteries in our Milky Way: the origin of a giant cloud of antimatter surrounding the galactic center. As reported by an international team in the January 10 issue of Nature, Integral found that the cloud extends farther on the western side of the galactic center than it does on the eastern side. This imbalance matches the distribution of a population of binary star systems that contain black holes or neutron stars, strongly suggesting that these binaries are churning out at least half of the antimatter, and perhaps all of it. "The reported Integral detection of an asymmetry represents a significant step forward toward a solution of one of the major outstanding problems in high-energy astrophysics. I think I can hear a collective sigh of relief emanating from the community," says Marvin Leventhal, a University of Maryland professor emeritus and a pioneer in this field.

32. ESO - 2001 A series of very detailed images of a binary system of two young stars have This is quite fortunate, as the study of binary stars is the only way in http://www.eso.org/public/outreach/press-rel/pr-2001/pr-22-01.html

ESO European Organisation for Astronomical Research in the Southern Hemisphere Press Releases 2001 ESO Home User Portal Contact Site Map Search: Go! 24 Jan 2008 ESO for the Public Press and Media Press Releases ... Science Users Information from the European Southern Observatory ESO Press Release 22/01 8 October 2001 For immediate release Young and Waltzing Binary Stars ADONIS Observes Low-mass Eclipsing System in Orion Summary A series of very detailed images of a binary system of two young stars have been combined into a movie In merely 3 days, the stars swing around each other. As seen from the earth, they pass in front of each other twice during a full revolution, producing eclipses during which their combined brightness diminishes A careful analysis of the orbital motions has now made it possible to deduce the masses of the two dancing stars . Both turn out to be about as heavy as our Sun. But while the Sun is about 4500 million years old, these two stars are still in their infancy. They are located some 1500 light-years away in the Orion star-forming region and they probably formed just 10 million years ago This is the first time such an accurate determination of the stellar masses could be achieved for a young binary system of low-mass stars . The new result provides an important piece of information for our current understanding of how young stars evolve. The observations were obtained by a team of astronomers from Italy and ESO using the ADaptive Optics Near Infrared System (ADONIS) on the 3.6-m telescope

33. Interactive Binary Stars Show Signs Of Induced Hyperactivity: IU News Room: Indi Astronomers studying highly energetic binary stars called polars have obtained the first observational evidence that the intense magnetic fields produced by http://newsinfo.iu.edu/news/page/normal/4632.html

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34. [0707.1872] Hypervelocity Binary Stars: Smoking Gun Of Massive Binary Black Hole Abstract The hypervelocity stars recently found in the Galactic halo are expelled from the Galactic center through interactions between binary stars and http://arxiv.org/abs/0707.1872

arXiv.org astro-ph Search or Article-id Help Advanced search All papers Titles Authors Abstracts Full text Help pages Full-text links: Download: PostScript PDF Other formats Citations SLAC-SPIRES HEP (refers to , cited by , arXiv reformatted) NASA ADS CiteBase p revious ... ext Astrophysics Title: Hypervelocity binary stars: smoking gun of massive binary black holes Authors: Youjun Lu Qingjuan Yu D.N.C. Lin (Submitted on 12 Jul 2007 ( ), last revised 22 Jul 2007 (this version, v2)) Abstract: The hypervelocity stars recently found in the Galactic halo are expelled from the Galactic center through interactions between binary stars and the central massive black hole or between single stars and a hypothetical massive binary black hole. In this paper, we demonstrate that binary stars can be ejected out of the Galactic center with velocities up to 10^3 km/s, while preserving their integrity, through interactions with a massive binary black hole. Binary stars are unlikely to attain such high velocities via scattering by a single massive black hole or through any other mechanisms. Based on the above theoretical prediction, we propose a search for binary systems among the hypervelocity stars. Discovery of hypervelocity binary stars, even one, is a definitive evidence of the existence of a massive binary black hole in the Galactic center. Comments: 5 pages, 3 figures, shortened version, ApJL in press

35. Science/AAAS | Science Magazine: Sign In Despite this progress, however, the role of binary stars HN2 has been much neglected. Although their importance in iron production in some supernovae and http://www.sciencemag.org/cgi/content/full/sci;311/5759/345

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36. Binary Stars - Space And Astronomy Definition - Online Dictionary And Glossary D binary stars from an ever growing glossary of space and astronomy definitions. Find the definitions for binary stars and all your space and astronomy http://space.about.com/od/glossaries/g/binarystars.htm

zGCID=" test0" zGCID=" test0 test6" zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') You are here: About Education Space / Astronomy Astronomy and Space Basics ... Astronomy Dictionary binary stars - Space and Astronomy Definition - Online Dictionary and Glossary Definition of binary stars Space / Astronomy Education Space / Astronomy Essentials ... Submit to Digg Books Related to Binary Stars An Introduction to Close Binary Stars Pulsar Astronomy Mass Transfer in Close Binary Stars Free Email Courses Space Tragedies 9 Planets in Nine Days Astronomy 101 Recent Discussions Stuff Race To Mars Race To Mars Most Popular Earth Globe Visual Tour of Solar System V838 Monocerotis Earth Pictures - A Growing Collection of Earth Pictures ... Neil Armstrong Biography "binary stars" From Nick Greene Your Guide to Space / Astronomy FREE Newsletter. Sign Up Now! Definition: binary stars: Binary stars are two stars that orbit around a common center of mass. An X-ray binary is a special case where one of the stars is a collapsed object such as a white dwarf, neutron star, or black hole, and the separation between the stars is small enough so that matter is transferred from the normal star to the compact star star, producing X-rays in the process. Books Related to Binary Stars An Introduction to Close Binary Stars Pulsar Astronomy Mass Transfer in Close Binary Stars Free Email Courses Space Tragedies 9 Planets in Nine Days Astronomy 101 Recent Discussions Stuff Race To Mars Race To Mars Related Articles star cluster - Space and Astronomy Definition - Online ...

37. Antimatter Cloud Traced To Binary Stars | Scientific Blogging Four years of observations from the European Space Agency’s Integral (INTErnational GammaRay Astrophysics Laboratory) satellite may have cleared up one of http://www.scientificblogging.com/news_releases/antimatter_cloud_traced_to_binar

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38. Binary And Variable Stars binary stars and variable stars are two extremely important groups of celestial objects. Observations of binary stars have allowed astronomers to determine http://outreach.atnf.csiro.au/education/senior/astrophysics/binary_variabletop.h

Australia Telescope Outreach and Education http://outreach.atnf.csiro.au/ The presentation of this page has been degraded because your browser lacks full support for style rules Home Education Senior ... Astrophysics Features About Us ATNF Overview History Achievements ... ATNF Work Experience Search: Go Binary and Variable Stars Credit: STScI NASA Artist's impression of an accreting binary system. Binary stars and variable stars are two extremely important groups of celestial objects. Observations of binary stars have allowed astronomers to determine the masses of stars and provided a wealth of information on the density, atmosphere and evolution of stars. Variable stars too provide information about the interiors and evolution of stars. They are also extremely useful as distance indicators, allowing astronomers to measure the distance to the clusters and galaxies where they are found. Historically the study of binaries and variables has changed our understanding of the scale of the Universe. Observing variable stars is one branch of astronomy that even amateurs can make a valuable contribution. Some can even be observed using the unaided eye and simple comparison charts. Organisations such as the

39. Multiple And Binary Star Systems: Optical Double Stars & Visual, Eclipsing, & Sp Most stars are actually binary stars or multiple star systems. The classifications include visual binaries, eclipsing binaries, and spectroscopic binaries. http://deep-space-astronomy.suite101.com/article.cfm/multiple_and_binary_star_sy

GA_googleAddSlot("ca-pub-7332027313721357", "com_scienceandnature_top_ATF_468x060"); GA_googleAddAttr("language", "com"); GA_googleAddAttr("section", "scienceand"); GA_googleAddAttr("topic", "AstronomyS"); GA_googleAddAttr("category", "deep-space"); GA_googleAddAttr("writer", "593469"); hiring freelance writers today's articles sign in Home ... Deep Space Astronomy Multiple and Binary Star Systems Multiple and Binary Star Systems Paul A. Heckert Jul 11, 2007 Most stars are actually binary stars or multiple star systems. The classifications include visual binaries, eclipsing binaries, and spectroscopic binaries. Introduction Over half of the stars we see are actually binary or multiple star systems. These systems are important to astronomers because we can measure the masses of stars by studying the orbital properties of binary stars, and there is no way to measure the mass of stars that are not part of binary star systems. There are several types of binary systems. Some binaries are more than one type. Optical Doubles Optical doubles are not true binary stars because they are not orbiting each other. They are an illusion caused by a chance alignment of stars. The stars appear very close in the sky but are different distances from Earth. They are actually very far apart. Its like an airplane flying in front of the Moon. It looks as if they are very close, but the Moon is much farther away.

40. IAU Conference Interacting Binary Stars - 2007 Invited reviews of main problems of modern research of binary stars are expected to be given at plenary sessions. Parallel and poster sessions covering will http://ibs2007.pochta.ru/

IAU Conference Interacting Binary Stars - 2007 Dedicated to the memory of Vladimir Platonovich Tsessevich Home Pre-registration form contact Related links: International Astronomical Union Odessa National University Odessa National Maritime University Odessa Group "Periodic and Aperiodic Processes in Stars" Odessa Astronomical Publications "Interacting Binary Stars-2003" Paper on V.P.Tsessevich "Interacting Binary Stars-1999" ... Links of the Ukrainian Association of Variable Stars Observers (UAVSO) Created using text editors and Quick HTML by I.L.Andronov The international conference "Interacting Binary Stars - 2007" This conference is planned for August 12-18, 2007. This year, due to absence of the IAU support, it will be a significant part of the larger conference "Modern Problems of Astronomy". The official languages are Ukrainian, Russian and English. The conference continues the sequence of annual scientific symposia on different topics held in Odessa since 1982. Some of these conferences had been dedicated to the memory of Prof. V.P.Tsessevich (1907-1983), the prominent astronomer, who contributed greatly to the field of research of binary and single variable stars of different types. The main topics of the conference reflect modern trends in investigation of interacting binaries with variable components of different types and in elaboration of new equipment and methods of mathematical modeling. We hope that the conference will point out new prospects for current research in the third Millennium and will strengthen impact of the international collaboration in the field.

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