Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..687s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 2, p. 687-702.
Astronomy and Astrophysics
Astronomy
77
Globular Clusters, Metallicity, Stellar Luminosity, Variable Stars, Least Squares Method, Morphology
Scientific paper
It is argued that the division of cluster variables into two nearly discrete period groups, which is the Oosterhoff dichotomy, is due to a combination of the continuous variation of period with metallicity and the blueward progression of cluster horizontal branches such as M13 out of the instability strip for intermediate metallicities for (Fe/H) between about -1.7 and -1.9. The subsequent evolutionary tracks, starting beyond the blue side of the instability strip, move into the strip above the zero-age horizontal branch, producing longer periods in this metallicity range. The strong variation of period with metallicity is seen both in the cluster data and in the field star data.
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