Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1171s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 1171-1175. Research supported by NASA.
Astronomy and Astrophysics
Astronomy
9
Astronomical Spectroscopy, Eclipsing Binary Stars, G Stars, Stellar Spectra, Stellar Spectrophotometry, Light Curve, Orbital Velocity, Radial Velocity, Spectrum Analysis, Stellar Evolution, Stellar Mass
Scientific paper
As a followup to a recent photometric study of BX Peg, spectroscopic observations have been obtained. Double-line radial velocity curves are presented. The curves indicate exceptionally large orbital veloc- ities of about 265 and 100 km/s, respectively, for the secondary and primary components. The systemic velocity is ˜25 km/s. A spectroscopic orbital solution and a simultaneous B, V light curve and velocity curve solution is presented. These reveal that BX Peg is a W-type W UMa contact system with a substantial fillout of ˜20%. A semimajor axis of 2.02 Rsun and a mass ratio, M2/M1, of 0.38 is calculated. The total system mass is 1.4 Msun. The rate of angular momentum loss gives evidence that BX Peg is rapidly merging into a single star.
Hube Douglas P.
Samec Ronald G.
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