The helium abundance in a globular-cluster star

Details The helium abundance in a globular-cluster star The helium abundance in a globular-cluster star

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978obs....98...11m&link_type=abstract

The Observatory, vol. 98, Feb. 1978, p. 11-13.

Computer Science

2

Abundance, Globular Clusters, Helium, Stellar Spectra, Asymptotic Giant Branch Stars, Atomic Spectra, Hydrogen, Line Spectra, Stellar Evolution, Stellar Luminosity, Stellar Models

Scientific paper

Results are reported for a determination of the helium abundance of the star UV5, which is located in the globular cluster NGC 1851. Two image-tube spectra of the star are analyzed, identifications and strengths of the He I lines present in the star's spectrum are given, and atmospheric parameters are computed. A He/H abundance ratio of 0.1 is obtained, and it is noted that this value is not consistent with the star's post-asymptotic-giant-branch stage of evolution. The nature of the He observed in very luminous blue stars is considered.

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