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Post Info TOPIC: Eclipsing Binary Stars
Blobrana


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RE: Eclipsing Binary Stars
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Title: First analysis of eight Algol-type systems: V537 And, GS Boo, AM CrB, V1298 Her, EL Lyn, FW Per, RU Tri, and WW Tri
Author: P. Zasche

Analysing available photometry from the Super WASP and other databases, we performed the very first light curve analysis of eight eclipsing binary systems V537 And, GS Boo, AM CrB, V1298 Her, EL Lyn, FW Per, RU Tri, and WW Tri. All of these systems were found to be detached ones of Algol-type, having the orbital periods of the order of days. 722 new times of minima for these binaries were derived and presented, trying to identify the period variations caused by the third bodies in these systems.

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Blobrana


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Posts: 131433
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Algol-Type Eclipsing Binary Stars
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Title: Phenomenological Modelling of the Light Curves of Algol-Type Eclipsing Binary Stars
Authors: Ivan L. Andronov

We introduce a special class of functions for mathematical modelling of periodic signals of special shape with irregularly spaced arguments. This method was developed for determination of phenomenological characteristics of the light curves, which are necessary for registration in the "General Catalogue of Variable Stars" and other databases. For eclipsing binary stars with smooth light curves - of types EB and EW - it is recommended a trigonometric polynomial of optimal degree in a complete or symmetric form. For eclipsing binary systems with relatively narrow minima (EA-type), statistically optimal is an approximation of the light curves in a class of non-polynomial spline functions. It is used a combination of the second-order trigonometric polynomial (TP2, what describes effects of "reflection", "ellipsoidality" and "spotness") and localised contributions of minima (parameterised in depth and profile separately for primary and secondary minima). Effectivity of the proposed method increases with decreasing eclipse depth. The method called NAV ("New Algol Variable"), was illustrated by application to eclipsing binary systems VSX J022427.8-104034=USNO-B1.0 0793-0023471, BM Ori, WZ Crv.

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Blobrana


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Posts: 131433
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RE: Eclipsing Binary Stars
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Title: Eclipsing Binary Stars: the Royal Road to Stellar Astrophysics
Authors: John Southworth (Keele University)

Russell (1948) famously described eclipses as the "royal road" to stellar astrophysics. From photometric and spectroscopic observations it is possible to measure the masses and radii (to 1% or better!), and thus surface gravities and mean densities, of stars in eclipsing binary systems using nothing more than geometry. Adding an effective temperature subsequently yields luminosity and then distance (or vice versa) to high precision. This wealth of directly measurable quantities makes eclipsing binaries the primary source of empirical information on the properties of stars, and therefore a cornerstone of stellar astrophysics. In this review paper I summarise the current standing of eclipsing binary research, present an overview of useful analysis techniques, and conclude with a glance to the future.

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Blobrana


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Title: Possible Misclassified Eclipsing Binary Stars Within the Detached Eclipsing Binary Light Curve Fitter (DEBiL) Data Set
Authors: Martin Nicholson

The dangers inherent in using fully automated data processing for large data sets are exemplified by examining the eclipsing binary stars identified via the Detached Eclipsing Binary Light curve fitter. The software may have confused eclipsing binaries with other types of low amplitude variable stars and it is estimated that over a quarter of the 10,862 variable stars listed may have been misclassified.

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