Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..559g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 15, 1986, p. 559-569.
Astronomy and Astrophysics
Astronomy
12
B Stars, Binary Stars, Inclination, Late Stars, Stellar Orbits, Stellar Rotation, Metallic Stars, Orbital Elements, Stellar Composition, Stellar Mass, Stellar Spectrophotometry
Scientific paper
Information on the orbital inclinations j of late B-type spectroscopic binaries (SB's) with periods between 3 and 50 days is obtained from the masses M1 of their primary components, derived from uvby-beta photometry, and the values of M1 sin cubed j. The cumulative distribution of j for a fairly complete sample of double-lined binaries (SB2's) with Hg-Mn primaries is consistent with that expected for random orientations of the orbital planes. The period-eccentricity relations for Hg-Mn SB's and normal, sharp-lined SB's do not differ significantly. Subsynchronous rotators occur among the components of Hg-Mn SB's (e.g. HR266, Kappa-Cnc, HR 4072, Chi-Lup and 74 Aqr) and superficially normal SB's (e.g. 64Ori, HR 7338 and possibly HR 4892); the subsynchronous primary of HR 7338 is metal poor. The slow rotation of Hg-Mn stars is probably due to special initial conditions or to a substantial loss of angular momentum during contraction to the main sequence. The orbital periods of three of the SB2's with nonsynchronous Hg-Mn components (HR 266, AR Aur and 74 Aqr) are only about 4 days, and these systems may pose a difficulty for the hypothesis that the abundance anomalies are due to the separation of elements by diffusion in quiescent atmospheres.
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