Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..558m&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Sept. 1, 1978, p. 558-564.
Astronomy and Astrophysics
Astrophysics
27
Astronomical Spectroscopy, Binary Stars, O Stars, Orbit Calculation, Balmer Series, Eccentric Orbits, Radial Velocity, Roche Limit, Stellar Motions
Scientific paper
HD 165052, O6.5 V, and HD 167771, O7.5 III((f)), are double-lined binaries with periods of six and four days, respectively, and velocity semiamplitudes near 100 km/s. In the reported spectroscopic orbital analysis, the effect of correcting the measured radial velocities for pair blending is investigated. The derived velocity amplitudes are increased by roughly 7%, and hence the minimum masses increase by 20%-25%. The raw data lead to minimum masses, m times (sin i)-cubed, between 2 and 3 solar masses. Since normal O stars are thought to have masses greater than 20 solar masses, the orbits must be highly inclined to the line of sight. Stellar radii are derived from the luminosities and effective temperatures. For HD 167771, the requirement that neither component overfill its Roche lobe implies that each has a mass in the neighborhood of 30 solar masses or larger.
Conti Peter S.
Morrison Nancy D.
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