The discovery of an O subdwarf in the globular cluster NGC 6712

Details The discovery of an O subdwarf in the globular cluster NGC 6712 The discovery of an O subdwarf in the globular cluster NGC 6712

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..109r&link_type=abstract

Astrophysical Journal, Part 1, vol. 240, Aug. 15, 1980, p. 109-113.

Astronomy and Astrophysics

Astronomy

8

Globular Clusters, O Stars, Stellar Evolution, Stellar Spectrophotometry, Subdwarf Stars, Ubv Spectra, Early Stars, Line Spectra, Spectrum Analysis, Stellar Structure, Ultraviolet Astronomy, Visual Photometry

Scientific paper

Spectral data for C49 in the globular cluster NGC 6712 are examined with reference to evolutionary models for low-mass stars that are contracting into white dwarfs. The spectrum of this star is found to be almost identical to that of the first sdO star found in a globular cluster, star A in NGC 6397. Analysis of the spectral data using nonlocal thermodynamic equilibrium models gives surface parameters T not less than 50,000 K, log g = 5.5 plus or minus 0.5, and N(He)/N(H) approximately equal to 0.1. The results are consistent with the models considered.

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