Absolute Properties of the Eclipsing Binary Star RT Coronae Borealis

Details Absolute Properties of the Eclipsing Binary Star RT Coronae Borealis Absolute Properties of the Eclipsing Binary Star RT Coronae Borealis

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....125.1448s&link_type=abstract

The Astronomical Journal, Volume 125, Issue 3, pp. 1448-1457.

Astronomy and Astrophysics

Astronomy

1

Stars: Binaries: Eclipsing, Stars: Binaries: Spectroscopic, Stars: Evolution, Stars: Fundamental Parameters, Stars: Individual (Rt Coronae Borealis)

Scientific paper

We present an analysis of existing photometric observations in U, B, and V, and a new light curve in V, as well as spectroscopic observations, of the 5.1 day period, double-lined main-sequence eclipsing binary RT CrB. From the analysis of the light curves and radial velocity curves, we have determined the masses and radii of the components: 1.343+/-0.010 Msolar and 2.615+/-0.04 Rsolar for the primary (hotter) component, 1.359+/-0.009 Msolar and 2.946+/-0.05 Rsolar for the secondary (cooler) component. The formal uncertainties in the masses are both less than 1%, and the formal uncertainties in the radii are both less than 2%. Based on the analyzed light curves, as well as the combined absolute photometry of the system, we estimate effective temperatures of 5781+/-100 K for the primary component and 5134+/-100 K for the secondary component, corresponding to spectral types of G5 and K0, respectively. Projected rotational velocities (vsini) from the spectrograms are measured as 25+/-2 km s-1 for the primary component and 33+/-3 km s-1 for the secondary component and are consistent with rotation that is synchronous with the orbital motion. Evolutionary tracks from the current models are in good agreement with the observations for a system of about age 3.5×109 yr with a slightly nonsolar chemical composition. We also report an approximate ΔP/P=3.0×10-6 decrease in the orbital period over 37 years.

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