Activity, metallicity, helium, and the Hyades anomaly

Details Activity, metallicity, helium, and the Hyades anomaly Activity, metallicity, helium, and the Hyades anomaly

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102...88d&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Jan. 1990, p. 88-95.

Astronomy and Astrophysics

Astronomy

5

Helium, Metallicity, Star Clusters, Stellar Activity, Anomalies, Stellar Composition, Stellar Spectrophotometry

Scientific paper

Stars in the Hyades cluster are compared with Coma cluster and main-sequence field stars to determine if the Hyades anomaly is truly a case of anomalous behavior. The difference in metallicity between the two clusters does not appear to account for the entire difference in the Stroemgren indices. It is shown that the levels of magnetic activity do not differ between the clusters and that activity is therefore not the culprit. It is harder to account for possible differences in helium abundance, and this problem is discussed.

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