The helium content of the peculiar Oosterhoff type I globular cluster Omega Centauri

Details The helium content of the peculiar Oosterhoff type I globular cluster Omega Centauri The helium content of the peculiar Oosterhoff type I globular cluster Omega Centauri

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..76..329c&link_type=abstract

Astrophysics and Space Science, vol. 76, no. 2, May 1981, p. 329-339.

Astronomy and Astrophysics

Astrophysics

4

Abundance, Globular Clusters, Helium, Variable Stars, Astronomical Models, Heavy Elements, Histograms

Scientific paper

An investigation of the observational properties for RR Lyrae variables in the galactic globular cluster Omega Centauri is reported. The results show that Omega Centauri belongs to the Oosterhoff Group I, notwithstanding the large, Oo II-like value of the average of the periods of ab-type RR Lyrae. The helium content is derived for this cluster from the analysis of the variables in the (A-log Te) plane. It is shown that the helium abundance is very close to the value Y = 0.30, about 0.05 larger than the value derived for the 'normal' Oo I globular cluster M3.

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