41. AstroRED.net - Binary Stars www.astrored.net/binarystars/ - 1k - Cached - Similar pages Carnegie Institution of WashingtonTwo out of every three stars in the Milky Way is a member of a binary or multiple star If binary stars can shelter planetary systems composed of outer http://www.astrored.net/binary-stars/

42. Mass Transfer In Binary Stars | Stars | AVA | Resources | Hayden Planetarium Video shows mass transfer in the binary star Algol (Beta Persei). http://www.haydenplanetarium.org/resources/ava/page/index.php?file=S1200algolbpi

43. Catalogoc Hartkopf, W. I., Mason, B. D. Worley C. E. Fifth Catalog of Orbits of Visual binary stars. Astrometry Department, U.S. Naval Observatory. http://www.usc.es/astro/catalogo.htm

Observatorio Astronómico Ramón María Aller CATALOGO DE ORBITAS Y EFEMERIDES DE ESTRELLAS DOBLES VISUALES Prefacio Que de chemin parcouru depuis le premier recueil d'orbites d'étoiles doubles visuelles publié en 1878 par Camille Flammarion dans son "catalogue des étoiles doubles et multiples" (Gauthier-Villars). Ce recueil comprend treize couples ayant accompli au moins une révolution observée et vingt-huit pour une demi-révolution. L'ensemble occupe une seule page à la fin de l'ouvrage. Depuis, les catalogues se sont multipliés surtout à partir des années 35 avec l'arrivée à maturité des couples découverts par Burnham, Aitken et Hussey, revivifiant le stock un peu figé des couples des Struve père et fils. Non seulement les catalogues d'orbites grossissent de décades en décades, mais ils s'affinent, ils donnent des mouvements orbitaux de plus en plus précis. Cependant ces mouvements s'expriment par de sèches colonnes d'éléments qui ne mettent pas en évidence les passages critiques des trajectoires; ils sont aveugles. Les catalogues d'éphémérides sont des compléments vivants des recueils d'orbites, car ils leur donnent la vue; ils renseignent d'un coup d'oeil l'observateur sur l'urgence de l'observation; ils permettent de parfaire les programmes en fonction de l'instrument; ils évitent nombre de mesures d'un faible poids scientifique, voire inutile.

44. Glossary Of Astronomical Terms/binary Star - Wikibooks, Collection Of Open-conte The gravitational interaction of binary stars allows astronomers to calculate the masses of these stars, something which is not possible with singular stars http://en.wikibooks.org/wiki/GAT:_binary_star

Glossary of Astronomical Terms/binary star From Wikibooks, the open-content textbooks collection Glossary of Astronomical Terms (Redirected from GAT: binary star Jump to: navigation search Return to Contents A binary star system consists of two stars that are orbiting their common center of mass. It is believed that as many as one quarter of all apparent stars are actually binary systems. As many as 10% of these binary systems may actually have more than two stars as in the Alpha Centauri system . The distances between stars in binary systems vary widely; sometimes they seem almost to touch, and other times their association may not be readily apparent. In the illustration below, the two stars in a binary system are close enough together that the larger one draws material off the atmosphere of the smaller one. The gravitational interaction of binary stars allows astronomers to calculate the masses of these stars, something which is not possible with singular stars. Question for Students: Must binary stars always be exactly opposite to each other in their orbits? Image:Gat answer button001.jpg

45. The CHARA Catalog Of Spectroscopic Binary Stars Home Page Paper in PASP describing the catalog The CHARA Catalog of Orbital Elements of Spectroscopic binary stars by Taylor, Stuart F.; Harvin, James A.; McAlister, http://www.chara.gsu.edu/~taylor/catalogpub/

The CHARA Catalog of Spectroscopic Binary Stars Home Page To accommodate the differing needs of ease of viewing vs. ease of use by computer, several output versions of the catalog are organized on this page. (Note that not all versions may be equally up-to-date.) Paper in PASP describing the catalog: The CHARA Catalog of Orbital Elements of Spectroscopic Binary Stars by Taylor, Stuart F.; Harvin, James A.; McAlister, Harold A. (see link for full reference; paper published May 2003, though given early electronic release). The CHARA Spectroscopic Binary Star Catalog , main text (tab-delimited) output version. (02 May 2003, current version, Aug 2003) This is the main version (though occasionally one of the other versions generated may be more recently updated, this plain text version is the version most carefully checked). See the Readme file for explanation of the headers. Readme file explaining format of catalog. Other versions in different formats: More easily viewed text format (secondary version) where column widths have been limited to aid viewing. Information is lost in the truncation, so consider this file to only be an aid to viewing; I plan to only occasionally regenerate this version, therefore, it may not be the fully up-to-date version (last generated 02 May 2002). An additional Truncated-Version-Readme explains this secondary version.

46. Educational Observatory - Binary Stars Eclipsing binary stars What are binary stars? Most stars are found in groups of stars that are gravitationally bound with each other. http://www.edu-observatory.org/eo/binary_stars.html

Binary Stars What are the differeces between double stars variable stars and binary stars Books Astronomy Picture of the Day News ... Eclipsing Binary Stars - What are Binary Stars? Most stars are found in groups of stars that are gravitationally bound with each other. The majority of these stars are found in binary systems which are systems of two stars in orbit around a common center of mass. One can classify binary stars based on their appearance from earth. Stars that are far enough apart to be distinguished from each other are known as visual binaries. Other binaries are too close and far away to be seen separately but can distinguished using the doppler shift of their spectra. These are spectroscopic binaries. Fix: Chapter 21 Binary Star Systems Interactive Star Atlas Object Catalogues: Named Stars Object Catalogues: Navigation Stars ... The Formation of Binary Stars - Recent observational investigations of the frequency of occurrence of pre-main-sequence binary stars have reinforced earlier suspicions that "binary formation is the primary branch of the star-formation process". A number of different theories have been proposed to explain the preponderance of binary stars. Klein et al.

47. The Astrophysics Spectator: Compact Binary Stars As X-ray Sources An overview of the xray emission from binary star systems containing a degenerate dwarf, neutron star, or black-hole candidate. http://www.astrophysicsspectator.com/topics/observation/XRayBinaryStars.html

The Astrophysics Spectator Home Topics Interactive Pages Commentary ... Information Search Site Observational Astronomy Overview Information in X-rays. X-ray Sources Stellar Corona ... Gamma-Ray Burst Experiments Definitions Photon Frequency and Energy Observational Astronomy X-rays from Compact Binary Stars Compact binary systems are among the brightest x-ray sources in the sky. These systems are compact in two senses: one of the stars in the binary is either a compact star, such as a degenerate dwarf or a neutron star,or a black-hole candidate, and the distance between the stars is so small that the gravitational pull of the compact object is stripping the companion star of its atmosphere. The consequence of this compactness is that matter from the companion star flows to the surface of the compact star, usually through an accretion disk , converting gravitational potential energy into thermal energy, and then into electromagnetic radiation. For many of these systems, the electromagnetic radiation appears predominately in the x-ray band, although it can also appear in the ultraviolet and gamma-ray bands. Compact binary systems are subdivided into two groups: the cataclysmic variables, which contain a degenerate dwarf, and the x-ray binaries, which contain a neutron star or a black-hole candidate.

48. Details For Eclipsing Binary Stars This website provides both basic and advanced information on simple models for computing light curves, a power point presentation on binary stars, http://www.compadre.org/astronomy/items/detail.cfm?ID=891

49. BBC NEWS | Science/Nature | Many Planets May Have Double Suns This finding suggests that planetary systems are at least as common around these binary stars as they are around single stars like our Sun. http://news.bbc.co.uk/1/hi/sci/tech/6506081.stm

@import "/css/screen/shared/styles.css?v2"; @import '/css/screen/shared/toolbar_ukfs.css?v1'; @import "/css/screen/nol/styles.css?v2"; @import "/css/screen/nol/furniture.css?v1"; @import "/css/screen/nol/promo.css"; @import "/css/screen/nol/programmes.css?v2"; @import "/css/screen/nol/business.css"; @import "/css/screen/nol/election07_index.css"; @import "/css/screen/nol/ukfs.css"; Accessibility Links Skip to content Skip to bbc.co.uk navigation Skip to search Access keys help ... bbc.co.uk bbc.co.uk Navigation Search Home TV Radio Talk ... Accessibility help BBC News 24 News services Your news when you want it News Front Page World UK England ... Special Reports RELATED BBC SITES SPORT WEATHER CBBC NEWSROUND ON THIS DAY ... EDITORS' BLOG Last Updated: Thursday, 29 March 2007, 18:35 GMT 19:35 UK E-mail this to a friend Printable version Many planets may have double suns In the film Star Wars, Luke Skywalker gazed at a twin sunset from his desert homeworld Enlarge Image The dual suns that rise and set over Luke Skywalker's homeworld in the film Star Wars may be more than just fantasy, according to data from Nasa. In a classic scene from the 1977 movie, the hero gazes into the distance as two yellow suns set on the horizon.

50. Binary Star - Wikipedia, The Free Encyclopedia A binary star is a stellar system consisting of two stars orbiting around their center of mass. For each star, the other is its companion star. http://en.wikipedia.org/wiki/Binary_star

Binary star From Wikipedia, the free encyclopedia Jump to: navigation search For the band, see Binary Star (band) Hubble image of the Sirius binary system, in which Sirius B can be clearly distinguished (lower left). A binary star is a stellar system consisting of two stars orbiting around their center of mass . For each star, the other is its companion star . Recent research suggests that a large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics , because observing their mutual orbits allows their mass to be determined. The masses of many single stars can then be determined by extrapolations made from the observation of binaries. Binary stars are not the same as optical double stars , which appear to be close together as seen from Earth , but may not be bound noticeably by gravity . Binary stars can either be distinguished optically (visual binaries) or by indirect techniques, such as spectroscopy . If binaries happen to orbit in a plane containing our line of sight, they will eclipse each other; these are called eclipsing binaries.

51. Binary And Variable Stars For a casual observer, binary star systems can often be confused with variable stars, and vice versa. The reason for this is that they both seem to vary http://filer.case.edu/sjr16/advanced/stars_binvar.html

Binary and Variable Stars Overview For a casual observer, binary star systems can often be confused with variable stars, and vice versa. The reason for this is that they both seem to vary their output of light. However, these two phenomenon are not related*, for binary stars are two stars that are locked in each others' gravitational pull and are destined to go through the universe spinning around each other. A variable star, on the other hand, is a star that, for one reason of another, changes its luminosity in either a predictable pattern or at random. *There are always exceptions to the rule, and in this case the exception is cataclysmic variable stars - stars in a binary system where one steels matter from the other and the extra mass periodically erupts in a thermonuclear explosion on the star's surface. Binary Star Systems Estimates are that at least 60% of stars are members of a binary (or more) system. These common systems can form in two main ways. Most frequently, they are

52. Multiple Star Systems If there are two stars in the system, it is called a binary star system. We shall concentrate on such binary systems as representative of multiple stars. http://csep10.phys.utk.edu/astr162/lect/binaries/binaries.html

Multiple Star Systems Although we are used to thinking of stars coming as individuals because our own Sun appears to be a lone star, this is not the norm. The evidence is that most stars that we see in the sky are parts of multiple star systems revolving around a common center of mass. If there are two stars in the system, it is called a binary star system . We shall concentrate on such binary systems as representative of multiple stars. Next Back Top Home Help

53. Binary And Multiple Stars binary and multiple stars are common in the universe. Stellar formation results in multiple systems at least as often as in single stars like our Sun, http://seds.org/messier/bina.html

Binary and Multiple Stars Click here to view a binary star from Messier's catalog The icon shows the 4-star system Binary and multiple stars are common in the universe. Stellar formation results in multiple systems at least as often as in single stars like our Sun, as observations suggest. The component stars in multiple systems orbit each other, and move around their center of mass, because of their mutual gravitational interaction, an effect which can be noted by observation of changes of their relative positions and radial velocities, and are all at about the same distance from us. Moreover, there frequently occur chance alignments of optical double or multiple stars, the "member" stars of which all lie at different, independent distances. These can be distinguished from physical binaries by observation, as the "component" stars, at their different distances, move independent from each other and show different and mutually uneffected velocities (radial velocities and proper motions). Although Messier's catalog was intended to contain only nebulous objects which may be taken for comets, and which we today have found to be clusters, nebulae, or galaxies, and not binary or multiple stars which hardly fall in this category, two have found their way into the Messier catalog:

54. Binary Star Simulation The observed velocities of the two stars, and the Doppler shifted spectral lines (as seen against the combined continuum from the two stars) are also shown http://www.phy.duke.edu/~kolena/binary/binary.html

O RBITING B INARY S TARS Description Instructions Example to try Astronomy 101/103 Cornell University Terry Herter You need a JAVA enabled browser to view this simulation. This simulation is a bit unstable and may bring down the machine you are running. DESCRIPTION: Allows you to set the masses, orbital separation, orbital eccentricity, the inclination angle to our line of sight, and the angle of the nodes of an orbiting star pair. You see the privileged (from above the orbit) and the earth view of the system (which depends on the inclination angle). The observed velocities of the two stars, and the Doppler shifted spectral lines (as seen against the combined continuum from the two stars) are also shown in the upper right box. The spectral lines associated with each star are indicated and the unshifted line positions are also marked. The movement of the spectral lines against the continuum has been greatly exaggerated for display purposes, and the difference in brightness of the two stars has been ignored. We have the following definitions: Mass 1 or Mass 2 The mass of each of the two stars.

55. X-ray Binary These Xray binaries are two stars which rotate around each other. The set of small GIF images used to create the X-ray binary inline animation is http://heasarc.gsfc.nasa.gov/docs/binary.html

Help/FAQ What's New Site Map NASA Homepage ... APOD X-ray Binary The brightest X-ray sources in our galaxy are X-ray binaries. These X-ray binaries are two stars which rotate around each other. One of the two is a normal star; but the other is a collapsed star, such as a neutron star or a black hole, which has about the same mass as our Sun but has shrunk to ten kilometers or less in radius. Material is drawn from the normal star and spirals in via an accretion disk onto the compact star. Intense X-ray emission is released from the inner region of the accretion disk where it falls onto the collapsed star. The set of small GIF images used to create the X-ray binary inline animation is available. See also the supernova and black hole inline animations. Visit the HEASARC Images and Video Archive. You are visitor number 1280. Web page maintained by Pat Tyler tyler@universe.gsfc.nasa.gov HEASARC Home Observatories ... Students/Teachers/Public Last modified: Thursday, 26-Jun-2003 13:48:43 EDT

56. Binary Star --  Britannica Online Encyclopedia Britannica online encyclopedia article on binary star pair of stars in orbit around their common centre of gravity. A high proportion, perhaps onehalf, http://www.britannica.com/eb/article-9079221/binary-star

var britAdCategory = "other"; Already a member? LOGIN Encyclopædia Britannica - the Online Encyclopedia Home Blog Advocacy Board ... Free Trial Britannica Online Content Related to this Topic This Article's Table of Contents binary star Print this Table of Contents Linked Articles eclipsing variable star Shopping New! Britannica Book of the Year The Ultimate Review of 2007. 2007 Britannica Encyclopedia Set (32-Volume Set) Revised, updated, and still unrivaled. New! Britannica 2008 Ultimate DVD/CD-ROM The world's premier software reference source. binary star Page 1 of 1 also called double star pair of stars in orbit around their common centre of gravity. A high proportion, perhaps one-half, of all stars in the Milky Way Galaxy are binaries or members of more complex multiple systems. Some binaries form a class of variable stars ( see eclipsing variable star binary star... (75 of 181 words) To read the full article, activate your FREE Trial Close Enable free complete viewings of Britannica premium articles when linked from your website or blog-post. Now readers of your website, blog-post, or any other web content can enjoy full access to this article on binary star , or any Britannica premium article for free, even those readers without a premium membership. Just copy the HTML code fragment provided below to create the link and then paste it within your web content. For more details about this feature, visit our

57. Binary Star The binary star Albireo (Beta Cygni), which consists of two stars orbiting around each other every 7300 years at a mean distance of about 400 billion miles http://www.daviddarling.info/encyclopedia/B/binarystar.html

TYPES OF STAR A B C ... CONTACT entire Web this site binary star The binary star Albireo (Beta Cygni), which consists of two stars orbiting around each other every 7,300 years at a mean distance of about 400 billion miles (650 billion km) Two stars in orbit around their common center of mass and held together by their mutual gravitational pull. Surveys have shown that one star in every two or three is a member of a binary or multiple star system. The two components of a binary system each move in an elliptical orbit around their common center of gravity. The further apart they are, the slower they move. Their orbital periods may be measured in tens, hundreds, or even millions of years. Physical double stars are binaries, whereas optical doubles are not. A visual binary is one whose components can be resolved visually or photographically. An astrometric binary gives itself away by a regular wobble in the motion of a visible component. In a spectroscopic binary , the apparent separation is so small that the presence of two stars can only be deduced from regular changes in the Doppler shift of the stars’ spectral lines. In a

58. Binary Star binary Star. + the Hungarian beauty blog + .. Bourjois lipgloss review Natural Body Scrub Five stars for olive oil It s a bargain! http://binary-star.blogspot.com/

skip to main skip to sidebar Binary Star + the Hungarian beauty blog + Thursday, January 24, 2008 Bourjois Rouge Connection Lipstick Swatches I know, I know... I should just go and take shots of birds, sunsets and pretty flowers instead of bugging you with my swatches. But I can't help it, I enjoy taking pics of my make-up sooo much and the weather outside is lousy anyway... Oh, by the way, this going to be totally random, but there's a rumor on my favorite Hungarian women's forum that there might just be a chance that we'll have The Body Shop in Hungary after all. Some ladies decided to take matters into their own hands and planning to fly over to NYC to start negotiating with the folks at TBS. There's another rumor, however, according to which a Russian company has already bought the franchise and will bring TBS to Hungary in 2009, aaand everything will be insanely expensive... Okay, I'm at a total loss when it comes to business and trading (I'm an arts graduate, after all... :-) so I don't exactly understand all this, especially why the fact that the franchise belongs to a Russian company would make the products so expensive, but whatever... I'm keeping my fingers crossed and hope that the above mentioned ladies succeed in the end. Okay, let's move on to the

59. BBC - H2g2 - Binary Star Systems binary star systems consist of two stars orbiting a common centre of mass. Multiple star systems such as binaries may make up the majority of stars we see http://www.bbc.co.uk/dna/h2g2/A381124

@import '/h2g2/skins/brunel/brunel.css'; @import '/includes/tbenh.css'; Home TV Radio Talk ... A-Z Index 24th January 2008 Accessibility help Text only Guide ID: A381124 (Edited) Edited Guide Entry SEARCH h2g2 Advanced Search New visitors: Returning members: BBC Homepage The Guide to Life The Universe and Everything 2. The Universe Space, Stars and Galaxies Created: 26th July 2000 Binary Star Systems Front Page What is h2g2? Who's Online Write an Entry ... Contact Us Like this page? Send it to a friend! Binary star systems consist of two stars orbiting a common centre of mass. Multiple star systems such as binaries may make up the majority of stars we see in the sky. There are several different classifications of Binary Star systems. Although there are no intrinsic differences between the stars in one type of system or another, the methods of observation used to determine that a system is a binary is different in each case. A binary, or double, star known in the Arabic world was Ursa Majoris, known to them as Mizar and Alcor, the horse and rider. They used this binary as a sight test; if your sight was good you would be able to see that there were two stars there, if it was bad then you would be unable to. Different Types of Binary Star Systems Visual Binaries Visual binaries are systems which can be resolved with a telescope. There are different types of visual binary:

60. High Energy Astrophysics Learning Center X-ray Binaries You will be blinded by a few hundred very bright Xray stars, concentrated mostly towards the center of our galaxy. To an optical astronomer an X-ray binary http://lheawww.gsfc.nasa.gov/users/white/xrb/xrb.html

X-ray Binaries If you have X-ray eyes and look up at the sky, it would be a very different and unusual sight. You will be blinded by a few hundred very bright X-ray stars, concentrated mostly towards the center of our galaxy. To an optical astronomer an X-ray binary is at first sight nothing special. But in X-rays they appear as blindingly bright stars, that we now know are black holes and neutron stars devouring material from a companion star. The brightest X-ray source in the sky, called Sco X-1, is an X-ray binary although probably the most famous X-ray binary system is Cygnus X-1, which is thought to be a black hole. This shows the sounding rocket that was launched around midnight on 1962, June 18/19 and discovered the first X-ray sources outside our solar system. This discovery by R. Giaconni and his collaborators began the field now known as X-ray astronomy. The first point X-ray source discovered was an X-ray binary, known as Sco X-1. Because X-ray binaries are so bright they were the first X-ray stars to be discovered by X-ray astronomers using very simple X-ray detectors launched into space in the 1960s. The original observations of X-ray binaries were made using brief 5 min sounding rocket flights. In such a brief interval it was hard to get sufficient detail to prove their nature. It was not until the launch of the Uhuru satellite by NASA in late 1969 that their binary nature was confirmed. The longer observations possible with an orbiting observatory revealed eclipses by the companion star and pulsations from the rotating neutron star. These X-ray observations, coupled with optical identifications established that the bright X-ray sources are binary systems containing a neutron star or black hole orbiting around a normal star, like our own sun. The neutron star or black hole captures material from the normal star and in doing so releases large amounts of energy as the material falls into the intense gravitational field (similar to the bang that results if a book is droped onto the floor). The study of these X-ray binary systems is fascinating because it allows us to probe extreme conditions not found on earth. The Rossi X-ray Timing Explorer (RXTE) was recently launched by NASA, with a prime goal the study of these systems in fine detail.

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