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	Eclipsing binary - Wikipedia, the free encyclopedia
		An eclipsing binary star is a binary star in which the orbit plane of the two stars lies so nearly in the line of sight of the observer that the components undergo mutual eclipses.
		Eclipsing binaries are variable stars, not because the light of the individual components vary but because of the eclipses.
		The light curve of an eclipsing binary is characterized by periods of practically constant light, with periodic drops in intensity.
	en.wikipedia.org /wiki/Eclipsing_binary (246 words)

	Eclipsing Binary Lab
		Eclipsing binary stars allow us to determine physical parameters, such as mass, size and distance between the stars, of the system, from observations of the lightcurve and other information on the system.
		These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other.
		It is classified as an EA type (Algol-type) eclipsing binary - the sharp and well-defined minima are caused by eclipses.
	www.mines.edu /Academic/courses/physics/phgn324/CLEA/eclipsbinary.html (806 words)

	AAVSO: Algol, January 1999 Variable Star Of The Month
		Algol is an eclipsing binary star system 93 light-years away as determined by the Hipparcos satellite.
		In 1881 astronomers theorized it was actually an eclipsing binary system based on evidence presented by Edward Pickering, the Director of the Harvard College Observatory (HCO).
		Algol (ß; Persei) is the brigh eclipsing binary with deep eclipses.
	www.aavso.org /vsotm/0199.stm (964 words)

	AAVSO: Eclipsing Binary Observing Program
		Algol (Beta Persei) is the prototype of eclipsing binary stars and has a period of about 2.87 days.
		Armed with a chart, an ephemeris and information about a star's eclipse elements it is always a good idea to locate the star field a few nights in advance of a scheduled minimum.
		On eclipse night plan to be in place early enough to obtain both the descending and ascending branches of the light curve.
	www.aavso.org /observing/programs/eclipser (671 words)

	eclipsing binary
		A binary star system in which the components periodically pass in front of one another as seen from Earth.
		Three main types of eclipsing binary are distinguished on the basis of their light curves: Algol stars, Beta Lyrae stars, and W Ursae Majoris stars.
		Eclipses may also occur in some kinds of cataclysmic binary, including dwarf novae, novae, and symbiotic stars.
	www.daviddarling.info /encyclopedia/E/eclipbin.html (187 words)

	Eclipsing Binary Stars
		Eclipsing binary stars are just one several types of variable stars.
		The variations in light intensity from eclipsing binary stars is caused by one star passing in front of the other relative to an observer.
		The shape of the light curve for an eclipsing binary star system depends mostly on the relative brightness and size of the two stars as well as their orbital inclination as seen from Earth.
	www.isc.tamu.edu /~astro/ebstar/ebstar2.html (989 words)

	eclipsing binary concept from the Astronomy knowledge base (Site not responding. Last check: 2007-11-07)
		The resulting variation is perceived luminosity of some eclipsing binaries has led to their classification as variable stars.
		has definition Eclipsing variables whose orbital plane lies so nearly in the line of sight that eclipses, as seen from the Earth, can occur and can be detected from their light curves.
		The visible component has been identified as the blue variable HZ Herculis, whose spectrum varies from late A or early F to B. Her X- l has a pulsation period of 1.2378 seconds, presumably its rotation period, and exhibits a 35-day quasi-periodicity in the X-ray region (but not in the optical).
	www.csi.uottawa.ca:4321 /astronomy/eclipsingbinary.html (1004 words)

	Eclipsing Binary Stars (Site not responding. Last check: 2007-11-07)
		Nightfall can produce animated views of eclipsing binary stars, calculate synthetic lightcurves and radial velocity curves, and eventually determine the best-fit model for a given set of observational data of an eclipsing binary star system.
		The majority of these stars are found in binary systems which are systems of two stars in orbit around a common center of mass.
		Other binaries are too close and far away to be seen separately but can distinguished using the doppler shift of their spectra.
	members.cox.net /astro7/binstar.html (728 words)

	Eclipsing Binary Stars (Site not responding. Last check: 2007-11-07)
		If the stars in a binary system are sufficiently close together and if we are sufficiently close to the plane of their orbit, then the two stars can eclipse each other in turn.
		The eclipsing binary project computes the light coming to us from the binary star system as a function of the orbital phase of the stars.
		During an eclipse, the portion of the eclipsed star that is hidden by the eclipsing star, emits no light seen by the observer.
	www.osc.edu /education/su_programs/si/si1997/projects/stars.html (409 words)

	Amazon.com: Eclipsing Binary Stars : Modeling and Analysis (Astronomy and Astrophysics Library): Books: R.E. ... (Site not responding. Last check: 2007-11-07)
		Since information gained from binary systems provides much of what we know of the masses, luminosities, and radii of stars, such models are acquiring increasing importance in studies of stellar structure and evolution.
		Focuses on the mathematical formulation of astrophysical models for the light curves of eclipsing binary stars, and on the algorithms for evaluating and exploiting such models.
		In this chapter we sketch the importance of eclipsing binaries for the determination of fundamental stellar data.
	www.amazon.com /exec/obidos/tg/detail/-/0387986227?v=glance (590 words)

	XX Leo: Eclipsing Binary Star
		Complete light curves for the eclipsing binary XX Leo have been produced in both the V and Cousins R bands.
		XX Leo is listed in the General Catalog of Variable Stars as an eclipsing binary of the Beta-Lyrae type with a period of 0.97094 days (Kholopov et al., 1985).
		In this case the smaller, less luminous star eclipses the larger, more luminous star (as well as partially eclipsing the contact point of the two) during primary minima.
	www.astro.psu.edu /users/stark/research/xxleo/xxleofig.html (2030 words)

	PROJECT CLEA: ECLIPSING BINARY STARS (Site not responding. Last check: 2007-11-07)
		These two labs developed by Claud Lacy of the University of Arkansas simulate eclipsing binary stars.
		The object is to identify which star in the field is the eclipsing binary star.
		In FindPeriod, the object is to determine the orbital period of an eclipsing binary star to 6-digit accuracy from the same 150 magnitude observations used in FindEB.
	www.gettysburg.edu /academics/physics/clea/binstlab.html (163 words)

	Eclipsing Binary Research (Site not responding. Last check: 2007-11-07)
		For many of these binaries we happen to lie near the plane of their orbit so that one star periodically covers the other, half an orbit later the other covers the one.
		Their nature is known by the periodic dimming of the brightness of the light of both that is combined into one dot on the sky.
		These eclipses are studied to compare their actual time of minimum light (when both stars are lined up with us) to the predicted time.
	www.acs.appstate.edu /dept/physics/caton/Binaries/Binaries.htm (427 words)

	M Dwarf Eclipsing Binary
		At first it was suspected of being a transiting planet, until further investigation showed that this was actually an eclipsing binary system with two very similar components.
		Detached spectroscopic eclipsing systems are of extreme value, because they permit us to obtain accurate and precise information about some fundamental properties of stars, such as mass and radius.
		Phase = 0 corresponds to center of secondary eclipse (when the smaller star is being eclipsed), phase = 0.5 corresponds to center of primary eclipse.
	www.hao.ucar.edu /public/research/stare/mdwarfbinary.html (591 words)

	eclipsing binary
		Binary (double) star in which the two stars periodically pass in front of each other as seen from Earth.
		When one star crosses in front of the other the total light received on Earth from the two stars declines.
		The first eclipsing binary to be noticed was Algol.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0010303.html (121 words)

	XX Leo: Eclipsing Binary Star
		Light curves for the eclipsing binary XX Leo have been produced in the Johnson V and Cousins R bands.
		He did, however, indicate that very few W UMa systems with periods around one day were detected in his studies, which may reflect a bias against the identification of eclipsing binaries with periods very close to one day, but which could also be a genuine property of those binary systems.
		Consistent with the flatness of the secondary eclipse, an edge-on orientation was assumed.
	www.astro.psu.edu /users/stark/research/xxleo/xxleofinal.html (1888 words)

	Nightfall Eclipsing Binary Star Program
		It can produce animated views of eclipsing binary stars, calculate synthetic lightcurves and radial velocity curves, and eventually determine the best-fit model for a given set of observational data of an eclipsing binary star system.
		The screenshots show a lightcurve of the eclipsing binary star TY Boo (left), a snapshot of the animated simulation of the same star (middle), and the interactive Roche potential display (right).
		Nightfall can handle a large range of binary star configurations, including overcontact (common envelope) systems, eccentric (non-circular) orbits, surface spots and asynchroneous rotation (stars rotating slower or faster than the orbital period), and the possible existence of a third star in the system ('third light').
	www.hs.uni-hamburg.de /DE/Ins/Per/Wichmann/Nightfall.html (544 words)

	AAVSO Eclipsing Binary Workshop (Site not responding. Last check: 2007-11-07)
		Visual Binaries - the two stars are resolved and we can see them orbit each other.
		Astrometric Binaries - one star traces a sinusoidal path on the sky due to the influence of the unseen companion.
		Eclipsing Binaries - the stars pass in front of each other as seen from Earth, causing the brightness to drop.
	www.boulder.swri.edu /~terrell/talks/aavso2001/frame01.html (69 words)

	eclipsing binary star on Encyclopedia.com (Site not responding. Last check: 2007-11-07)
		ECLIPSING BINARY STAR [eclipsing binary star] see binary star ; variable star.
		Light curves of short period eclipsing binary stars.
		A 'brickbat' in the sky; the multiple star system Epsilon Aurigae fascinates astronomers every 27 years.
	www.encyclopedia.com /html/X/X-eclipsin.asp (212 words)

	MSN Encarta - Search Results - Eclipsing Binary (Site not responding. Last check: 2007-11-07)
		Eclipsing Binary, pair of stars orbiting each other in which one star periodically passes in front of the other as seen from Earth, thereby causing an...
		The term encompasses stars that actually fluctuate in their light output (intrinsic...
		Eclipse, the obscuring of one celestial body by another, particularly that of the Sun or a planetary satellite.
	uk.encarta.msn.com /Eclipsing_Binary.html (108 words)

	Eclipsing Binary Stars In The Magellanic Clouds (ResearchIndex)
		Abstract: Within the next few years eclipsing binaries should yield primary distance measurements for the Magellanic Clouds as well as provide tests of theoretical low-metallicity stellar models.
		Key Words : eclipsing binary stars, Magellanic Clouds, stellar evolution, distance indicators I.
		INTRODUCTION Eclipsing binaries in the Magellanic Clouds are currently of interest: 1) For tests of models of stellar structure and evolution at low metallicity (Milky Way, z¸0.020; LMC, z¸0.008; SMC, z¸0.004),...
	citeseer.ist.psu.edu /56440.html (217 words)

	Eclipsing Binary Stars in Globular Clusters (Site not responding. Last check: 2007-11-07)
		Our aim is to identify candidates for eclipsing binary systems in these clusters for which we will then perform subsequent spectroscopic observations.
		The values of the masses will, in the case of an evolved binary system (with mass transfer and/or loss), provide a lower limit to the cluster's turnoff mass at its present age.
		We confirm their membership in the cluster and discuss our preliminary estimates of the binary components' masses, as well as what they mean regarding the cluster age.
	www.aas.org /publications/baas/v28n4/aas189/abs/S071012.html (324 words)

	Eclipsing Binary Stars (Site not responding. Last check: 2007-11-07)
		These component stars are often so close that their separation cannot be detected visually or even with the aid of a telescope.
		Some of these star systems are given away, however, by their varying brightness over the course of their orbits as one star eclipses its companion, blocking our view of its light.
		Our study is to monitor the brightness of several of these eclipsing binary star systems and chart their orbits and times of eclipse.
	www.lclark.edu /~science/binary (191 words)

	Eclipsing Binary Simiulation (Site not responding. Last check: 2007-11-07)
		Orbiting stars which are separated by a small distance may pass in front of one another.
		It is not possible for astronomers to see the individual stars, but there will be a change in the total light coming from the two stars when they "eclipse" one another.
		Angle of the orbital plane of the stars to our line-of-sight.
	instruct1.cit.cornell.edu /courses/astro101/java/eclipse/eclipse.htm (183 words)

	AAVSO: Eclipsing Binary Ephemerides
		An expanded eclipsing binary ephemerides can also be found at the Milwaukee Astronomical Society website.
		Eclipsing Binary Ephemeris 2006 pdf file (4 MB)
		Eclipsing Binary Ephemeris 2005 pdf file (2.5 MB)
	www.aavso.org /observing/programs/eb/ebephem.shtml (48 words)

	Eclipsing Binary Stars (Site not responding. Last check: 2007-11-07)
		A binary star system is, at it's simplest, two stars rotating about a common center of mass.
		Not all stars have the same exact mass, so their center of common mass varies from system to system.
		Mail to the Eclipsing binary stars group members
	www.osc.edu /education/su_programs/si/si1995/projects/stargroup.html (326 words)

	Eclipsing Binary Simulator (EBS) - Home Page (Site not responding. Last check: 2007-11-07)
		EBS is an astronomy application to visualise the orbit and synthetic light curve of binary star systems.
		Robert Wilson : Understanding binary stars via light curves
		Comments, bug reports and feature suggestions are welcome and can be send to: ebs@cosmion.net.
	www.cosmion.net /software/ebs (119 words)

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