Absolute Properties of the Highly Eccentric, Solar-type Eclipsing Binary HD 74057

Details Absolute Properties of the Highly Eccentric, Solar-type Eclipsing Binary HD 74057 Absolute Properties of the Highly Eccentric, Solar-type Eclipsing Binary HD 74057

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aj....143....5s&link_type=abstract

The Astronomical Journal, Volume 143, Issue 1, article id. 5 (2012).

Astronomy and Astrophysics

Astronomy

Binaries: Close, Binaries: Eclipsing, Binaries: Spectroscopic

Scientific paper

We have obtained Strömgren b and y differential photometric observations of the solar-type eclipsing binary HD 74057 plus follow-up high-resolution, red wavelength spectroscopic observations. The system has an orbital period of 31.2198 days, a high eccentricity of 0.47, and is seen almost exactly edge on with an inclination of 89fdg8. The two main-sequence G0 stars are nearly identical in all physical characteristics. We used the Wilson-Devinney program to obtain a simultaneous solution of our photometric and spectroscopic observations. The resulting masses of the components are M 1 = 1.138 ± 0.003 M &sun; and M 2 = 1.131 ± 0.003 M &sun;, and the radii are R 1 = 1.064 ± 0.002 R &sun; and R 2 = 1.049 ± 0.002 R &sun;. The effective temperatures are 5900 K (fixed) and 5843 K, and the iron abundance, [Fe/H], is estimated to be +0.07. A comparison with evolutionary tracks suggests that the system may be even more metal rich. The components rotate with periods of 8.4 days, significantly faster than the predicted pseudosynchronous period of 12.7 days. We see evidence that one or both components have cool spots. Both stars are close to the zero-age main sequence and are about 1.0 Gyr old.

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