Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astl...37..414g&link_type=abstract
Astronomy Letters, Volume 37, Issue 6, pp.414-419
Astronomy and Astrophysics
Astronomy
Close Binary Stars, Absolute Parameters, Am Stars, Stellar Age
Scientific paper
Based on two high-dispersion spectra of the close binary BW Boo, we have detected lines of the secondary component whose contribution to the combined spectrum does not exceed 2%. We have determined the rotation velocities of the components and spectroscopic orbital elements. Numerous lines of neutral and ionized iron have been used to determine the effective temperature and surface gravity for the primary component. The photometric light curves for this binary have been solved for the first time. Its primary component is an A2Vm star with a mass of 2 ± 0.1 M &sun; and a radius of 1.9 ± 0.4 R &sun;. Its rotation velocity is 2 km s-1, which is a factor of 18 lower than the pseudo-synchronous velocity for this component. The G6 secondary component, a T Tau star, has a rotation velocity of 17 km s-1, amass of 1.1 M &sun;, and a radius of 1 R &sun;. The age of the binary has been estimated to be 107 yr.
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