A radial velocity survey of extremely hydrogen-deficient stars

Details A radial velocity survey of extremely hydrogen-deficient stars A radial velocity survey of extremely hydrogen-deficient stars

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..317j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, May 15, 1987, p. 317-339.

Astronomy and Astrophysics

Astronomy

33

Binary Stars, Hot Stars, Radial Velocity, B Stars, Hydrogen, Stellar Evolution, Stellar Spectra, Stellar Temperature

Scientific paper

A radial velocity survey of hot extremely hydrogen-deficient stars confirms HDE 320156 to be a single-lined spectroscopic hydrogen-deficient binary. The three hydrogen-deficient stars detected all show weak C-lines. Little evidence is found for the small-amplitude radial velocity variations known to be present among the extreme-helium (EHe) stars. The heliocentric radial velocity distributions and kinematics of the known EHe stars are found to be consistent with an old stellar population which is strongly concentrated towards the Galactic center, and evidence suggests that the EHe stars are all single.

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