Absolute Properties of the Main-Sequence Eclipsing Binary Star EY Cephei

Details Absolute Properties of the Main-Sequence Eclipsing Binary Star EY Cephei Absolute Properties of the Main-Sequence Eclipsing Binary Star EY Cephei

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aj....131.2664l&link_type=abstract

The Astronomical Journal, Volume 131, Issue 5, pp. 2664-2672.

Astronomy and Astrophysics

Astronomy

7

Stars: Binaries: Eclipsing, Stars: Binaries: Spectroscopic, Stars: Evolution, Stars: Fundamental Parameters, Stars: Individual (Ey Cephei)

Scientific paper

We present 6907 differential photometric observations in the V filter, as well as 52 radial velocities from spectroscopic observations of the detached, eccentric 7.97 day double-lined eclipsing binary star EY Cep. Absolute dimensions of the components are determined with high precision (less than 1% in the masses and radii) for the purpose of testing various aspects of theoretical modeling. We obtain 1.523+/-0.008 Msolar and 1.463+/-0.010 Rsolar for the primary and 1.498+/-0.014 Msolar and 1.468+/-0.010 Rsolar for the secondary. The effective temperatures and interstellar reddening of the stars are accurately determined from the spectra, uvbyβ, and UBV photometry: 7090+/-150 K for the primary and 6970+/-150 K for the secondary, corresponding to spectral types of F0 and F0, and 0.036 mag for the color excess Eb-y. Spectral line widths give rotational velocities that are synchronous with the mean orbital motion in a highly eccentric orbit (e=0.4429). The components of EY Cep are young main-sequence stars with an age of about 40 million years, according to models.
Some of the observations reported here were obtained with the MMT, a joint facility of the Smithsonian Institution and the University of Arizona.

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