Physics – Optics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100.1436n&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Nov. 1988, p. 1436-1442.
Physics
Optics
10
Binary Stars, O Stars, Stellar Spectra, Cassegrain Optics, Main Sequence Stars, Orbital Elements, Radial Velocity, Stellar Mass
Scientific paper
The first determination of the spectroscopic orbital elements, the spectral types, and the flux ratio in blue light has been made of the components of the double-lined spectroscopic binary HD 165921. The period is 1.744215 d + or - 0.000005 d, and the orbit is essentially circular. The mass ratio is 1.41 + or - 0.05, and the minimum mass of the primary is 19 + or - 1 solar. The spectral types of the components are estimated to be O7 V and O9 V. The magnitude difference in blue light is 0.7 + or - 0.2 mag. Measurements of He I linewidths yielded v sin i = 185 + or - 13 km/s for the primary and 180 + or - 9 km/s for the secondary. These values suggest that the rotational and orbital motions are nearly synchronous. The system is probably near contact. The mass ratio and the luminosity ratio are consistent with both stars being on the ZAMS.
Morrison Nancy D.
Niemela Virpi S.
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