Constraints of a pulsation frequency on stellar parameters in the eclipsing spectroscopic binary system: V577 Oph

Details Constraints of a pulsation frequency on stellar parameters in the eclipsing spectroscopic binary system: V577 Oph Constraints of a pulsation frequency on stellar parameters in the eclipsing spectroscopic binary system: V577 Oph

2010-11-12

arxiv.org/abs/1011.3028v1

AN 331, No. 9/10, 952 955 (2010)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted by AN

Scientific paper

10.1002/asna.201011434

We present a preliminary spectroscopic analysis of the binary system V577Oph, observed during the summer of 2007 on the 2.6m NOT telescope on La Palma. We have obtained time series spectroscopic observations, which show clear binary motion as well as radial velocity variations due to pulsation in the primary star. By modelling the radial velocities we determine a full orbital solution of the system, which yields M_A sin^3 i = 1.562 +/- 0.012 M_solar and M_B sin^3 i = 1.461 +/- 0.020 M_solar. An estimate of inclination from photometry yields a primary mass of 1.6 M_solar. Using this derived mass, and the known pulsation frequency we can impose a lower limit of 1 Gyr on the age of the system, and constrain the parameters of the oscillation mode. We show that with further analysis of the spectra (extracting the atmospheric parameters), tighter constraints could be imposed on the age, metallicity and the mode parameters. This work emphasizes the power that a single pulsation frequency can have for constraining stellar parameters in an eclipsing binary system.

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