Chromospherically active stars. VIII - HD 155638 = V792 Herculis: Observational constraints on evolutionary theory

Details Chromospherically active stars. VIII - HD 155638 = V792 Herculis: Observational constraints on evolutionary theory Chromospherically active stars. VIII - HD 155638 = V792 Herculis: Observational constraints on evolutionary theory

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1489f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, April 1991, p. 1489-1494. Vanderbilt University-supported research.

Astronomy and Astrophysics

Astronomy

12

Chromosphere, Eclipsing Binary Stars, Stellar Activity, Stellar Atmospheres, Stellar Evolution, F Stars, Hertzsprung-Russell Diagram, K Stars, Radial Velocity, Stellar Mass, Stellar Spectra

Scientific paper

V792 Her is an eclipsing RS CVn binary with an orbital period of 27.54 days whose components have spectral types of K0 III and F2 IV. New spectroscopic observations combined with existing photometry have resulted in masses of 1.47 + or - 0.003 solar mass and 1.41 + or - 0.003 solar mass for the K giant and F star, respectively. Additional fundamental parameters are derived. Standard evolutionary models were specifically computed by VandenBerg (1990) for the two stars. The best fit occurs if the components are somewhat metal poor with Fe/H/ = - 0.46. Ages of about 2.3 x 10 to the 9th yr derived for the two components differ by less than 3 percent. Thus, standard evolutionary models with no convective overshoot are able to fit the observed parameters of stars as massive as 1.45 solar mass. However, a definitive comparison is not yet possible since the metal abundance of the stars is unknown and metal-poor convective-overshoot tracks in this mass range are needed.

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