Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1870s&link_type=abstract
Astronomical Journal, vol. 86, Dec. 1981, p. 1870-1881.
Astronomy and Astrophysics
Astronomy
26
Cepheid Variables, Globular Clusters, Periodic Variations, Star Clusters, Stellar Evolution, Color-Magnitude Diagram, Hertzsprung-Russell Diagram, Stellar Luminosity, Stellar Oscillations
Scientific paper
Of the 38 M15 RR Lyrae stars investigated, 19 have probably undergone period changes between 1896 and 1978 of both abrupt and gradual character. Five times as many stars are believed to have increased in period as decreased, and period changes show no correlation with position in the color-magnitude diagram, contrary to evolutionary expectation. The ab-types variables tend to have larger changes than the c types, but the difference in the mean rate of period change for a band c-type variables is found to be too small to be significant. It is suggested that observations of the M15 variables over the next century may clarify the possibility of evolutionary period change detection, despite short-period noise due to erratic changes in the stellar radius.
Sandage Alan
Smith Harold A.
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