Helium abundances from RR Lyrae variables in galactic globular clusters

Details Helium abundances from RR Lyrae variables in galactic globular clusters Helium abundances from RR Lyrae variables in galactic globular clusters

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mmsai..50..113c&link_type=abstract

(Workshop on Chemical Inhomogeneities in the Galaxy, Frascati, Italy, May 29-June 2, 1978.) Società Astronomica Italiana, Memori

Astronomy and Astrophysics

Astronomy

1

Abundance, Cepheid Variables, Globular Clusters, Helium, Variable Stars, Astronomical Spectroscopy, Hertzsprung-Russell Diagram, Stellar Evolution

Scientific paper

A variety of data, including synthesized HB populations and mean fundamental period plots, are used to obtain helium abundances for RR Lyrae in galactic globular clusters. A low helium content indication is derived for the anomalous Oosterhoff type I globular cluster NGC 4147, and it is found that the high helium abundance derived for the anomalous globular cluster Omega Cen is in agreement with previous evaluations by independent methods.

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