Helium abundances from young stars and open clusters

Details Helium abundances from young stars and open clusters Helium abundances from young stars and open clusters

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983prhe.work..163n&link_type=abstract

IN: ESO Workshop on Primordial Helium, Garching, West Germany, February 2, 3, 1983, Proceedings (A83-50030 24-90). Garching, Wes

Physics

8

Abundance, Early Stars, Helium, Open Clusters, B Stars, Cosmology, Line Spectra, Nuclear Fusion, Stellar Spectra

Scientific paper

Evidence of helium abundance variations among open clusters obtained from the study of helium line spectra of young stars and from the ZAMS locations of clusters in the c(1), (b-y) and c(0), beta diagrams is discussed. The inferred helium-to-hydrogen variations are quite large at 0.06, corresponding to a helium abundance variation of 0.10. Young clusters situated 1 to 2 kpc away in the outer parts of the galaxy have a lower helium abundance than clusters in the solar neighborhood. Suggestions for further studies of these possible helium abundance variations using the ESO CASPEC instrument are given.

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