Horizontal-branch stars in NGC 6752 with strong helium lines

Details Horizontal-branch stars in NGC 6752 with strong helium lines Horizontal-branch stars in NGC 6752 with strong helium lines

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309l..23c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. L23-L26.

Astronomy and Astrophysics

Astrophysics

7

Abundance, Globular Clusters, Helium, Horizontal Branch Stars, Line Spectra, Stellar Spectrophotometry, Stellar Rotation

Scientific paper

Two hot horizontal-branch (HB) stars have been observed in the globular cluster NGC 6752. Both stars have strong He I lines at 4026A which indicate an abundance which is similar to that of Population I stars. These are the only observations of globular cluster HB stars showing apparently normal helium abundance. How these observations may be related to some unsolved problems of horizontal-branch morphology is considered.

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