Evidence of helium abundance differences between the Hyades stars and field stars, and between Hyades stars and Coma cluster stars

Details Evidence of helium abundance differences between the Hyades stars and field stars, and between Hyades stars and Coma cluster stars Evidence of helium abundance differences between the Hyades stars and field stars, and between Hyades stars and Coma cluster stars

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94....5s&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 94, Feb. 1982, p. 5-15. Research supported by the Statens Naturvidenskab

Astronomy and Astrophysics

Astronomy

70

Abundance, Dwarf Stars, Helium, Star Clusters, Star Distribution, F Stars, Hydrogen, Northern Hemisphere, Southern Hemisphere, Stellar Atmospheres, Stellar Envelopes, Stellar Evolution, Stellar Structure

Scientific paper

Systematic differences in the c1,(b-y) diagram between unevolved stars of the Hyades and of corresponding field stars and stars of the Coma cluster are discussed and interpreted in terms of a low prestellar helium abundance for the Hyades. Calculations of the lower envelope in the c1,(b-y) diagram for Hyades stars and 1698 Northern Hemisphere and 1297 Southern Hemisphere stars of the same metallicity are presented which demonstrate differences with field stars and stars of the Coma cluster even when the metal/hydrogen ratio is taken into account. Considerations of the nature of the c1 index expressing fundamental parameters of the stellar atmosphere indicate that the only parameter likely to vary significantly among ZAMS Haydes F dwarfs and field stars of the same metallicity is the hydrogen/helium ratio, which must be lower by 0.06 in the Hyades. Similarities with the c1 values of field stars also suggest Coma cluster stars to have greater hydrogen/helium ratios than the Hyades.

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