Observations of an sdO star in the globular cluster M22

Details Observations of an sdO star in the globular cluster M22 Observations of an sdO star in the globular cluster M22

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..326g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 1, 1985, p. 326-330. Research supported by the Natural Sciences a

Astronomy and Astrophysics

Astronomy

12

Early Stars, Globular Clusters, Hot Stars, O Stars, Stellar Spectra, Absorption Spectra, H Lines, Radial Velocity, Ultraviolet Astronomy

Scientific paper

Spectra of the hot, UV-bright star II-81 in the globular cluster M22 show absorption lines of H I, He I, and He II, and have been used to estimate a spectral type of O6. The measured radial velocity of -140 km/s agrees well with the cluster velocity of -152 km/s, determined by Webbink (1981), and supports the probable membership of this star in the cluster. The profile of H-delta implies a value of log g = 4.2. Using MV = 0.5 for this star, a mass of 0.44 solar mass, in good agreement with results on cluster sdO stars, is derived. Comparison of this and other cluster sdO stars with field sdO stars suggests that the former have systematically lower log g values for the same range of temperatures. Possible interpretations in terms of existing theories for the evolutionary status of sdO stars are discussed.

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