Astronomy and Astrophysics – Astronomy
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..767r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, May 1985, p. 767-772. Research supported by the Natural Sciences and Engineering
Astronomy and Astrophysics
Astronomy
19
Binary Stars, Light Curve, Radial Velocity, Stellar Evolution, Stellar Mass, Stellar Structure, Cross Correlation, Doppler Effect, H Gamma Line, Stellar Magnitude, Stellar Spectrophotometry, Stellar Winds
Scientific paper
The data from 22 spectra of AW Ursae Majoris obtained at the David Dunlap Observatory have been analyzed. Radial velocities of the primary component were measured using Griffin-type cross-correlation techniques. Line profiles were modeled to estimate the distortion of the measured radial-velocity curve due to proximity effects. The radial-velocity amplitude of the primary was found to be 22.2 + or - 0.9 km/s. The mass of AW Ursae Majoris was found to be 1.3 + or - 0.2 solar masses, if the mass ratio q is 0.079, and 1.7 + or - 0.3 solar masses if q = 0.070. Such masses are much smaller than the values found in previous studies. The new result agrees well with evolutionary theories of contact binaries if A W UMa is a terminal-age main-sequence system. The observed H-gamma profile was narrower than the theoretical one, but this result depends on the uncertain definition of the continuum. The absolute magnitude M(V) is 2.6, which is 0.5-mag brighter than inferred by Eggen (1967) from the common proper-motion companion BD + 30 deg 2164.
Bolton Charles T.
Mochnacki Stefan Wladyslaw
Rensing M. J.
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