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Title:
Observations and Analysis of the Field Contact Binary V728 Herculis
Authors:
Nelson, R. H.; Milone, E. F.; Vanleeuwen, J.; Terrell, Dirk; Penfold, J. E.; Kallrath, J.
Publication:
Astronomical Journal v.110, p.2400 (AJ Homepage)
Publication Date:
11/1995
Origin:
AJ; KNUDSEN
AJ/ApJ Keywords:
STARS: INDIVIDUAL: V728 HERCULIS, CATACLYSMIC VARIABLES, BINARIES: CLOSE
DOI:
10.1086/117699
Bibliographic Code:
1995AJ....110.2400N

Abstract

The W UMa system V728 Her has been observed photometrically in B, V, and IC passbands at the RAO over five seasons and spectroscopically at DAO over three seasons to obtain radial velocities. New times of minima are provided and a period analysis confirms previous ephemerides. The light and radial velocity curves were analyzed with the latest University of Calgary enhancements to the Wilson-Devinney program and new solutions found. The best model is that involving a contact system with convective atmospheres. In probing the best solution possible, use was made of the enhanced reflection and second-order limb-darkening calculations available in the 1993 version of the WD program. The mass ratio is found to be 0.1786±0.0023. The contact parameter is found to be f=0.71±0.1l. The masses are determined to be 1.654±0.037 Msun and 0.295±0.009 Msun and the radii are l.784±0.0l5 Rsun and 0.867±0.054 Rsun, respectively. The determined temperature difference, T2 - T1 is 165±19 K, and the luminosities for components 1 and 2 are 5.5±0.5 Lsun and 1.4±0.3 Lsun, respectively.

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