Absolute Properties of the Eclipsing Binary Star FS Monocerotis

Details Absolute Properties of the Eclipsing Binary Star FS Monocerotis Absolute Properties of the Eclipsing Binary Star FS Monocerotis

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....119.1389l&link_type=abstract

The Astronomical Journal, Volume 119, Issue 3, pp. 1389-1397.

Astronomy and Astrophysics

Astronomy

20

Stars: Binaries: Eclipsing, Stars: Binaries: Spectroscopic, Stars: Evolution, Stars: Fundamental Parameters, Stars: Individual: Constellation Name: Fs Monocerotis

Scientific paper

We present photometric observations in B and V as well as spectroscopic observations of the 1.9 day-period, double-lined main-sequence eclipsing binary FS Mon. From the analysis of the light curves and radial velocity curves, we have determined the masses and radii of the components: 1.631+/-0.012 Msolar and 2.051+/-0.012 Rsolar for the primary component; 1.461+/-0.010 Msolar and 1.629+/-0.012 Rsolar for the secondary component. The formal uncertainties are all less than 1%. Based on our light curves as well as on the combined-light photometry of the system, we estimate effective temperatures of 6715+/-100 K for the primary and 6550+/-100 K for the secondary component, corresponding to spectral types of F2 and F4, respectively. Projected rotational velocities (vsini) from the spectograms are measured as 52+/-2 km s-1 and 43+/-3 km s-1, respectively, from the spectrograms and are consistent with rotation that is synchronous with the orbital motion. Evolutionary tracks from current models are in good agreement with the observations for a system age of about 1.6x109 yr with slightly nonsolar chemical composition. We find the best match for models with a slightly lower helium abundance and a higher metal abundance than the Sun. An accurate metallicity determination for FS Mon is needed to constrain the models further. Some of the observations reported in this paper were obtained with the Multiple Mirror Telescope, which is operated jointly by the University of Arizona and the Smithsonian Institution.

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