Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277...87w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 1, pp. 87-94.
Astronomy and Astrophysics
Astronomy
17
Binaries: Close, Binaries: Eclipsing, Stars: Fundamental Parameters, Stars: Individual: Be Uma, Stars: Late-Type, Subdwarfs
Scientific paper
We present UBVR photometry of eclipses in the post-common-envelope binary BE UMa. The eclipse is partial in all colours. We fit the eclipses to determine the orbital inclination and the radius of each star. For our best fit we find i=82.˚4+/-0.˚1, R_1/a=0.0781+/-0.0001 and R_2/a=0.138+/-0.001. Using the measured radial velocity of the secondary star, which we correct to account (approximately) for the asymmetric distribution of the line emission, we can calculate the system parameters of the binary for a given mass ratio. We find that for all mass ratios the primary star is a subdwarf and the secondary star lies well inside its Roche lobe. We use the fitted secondary star fluxes to determine its spectral type (G6V-K4V) and hence its mass, 0.69
Robinson Emma L.
Wood Janet H.
Zhang Er-Hu
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