The luminosity function for the globular cluster M15

Details The luminosity function for the globular cluster M15 The luminosity function for the globular cluster M15

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.183...51s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 183, no. 1, Sept. 1991, p. 51-65.

Astronomy and Astrophysics

Astrophysics

Globular Clusters, Stellar Luminosity, Blue Stars, Color-Magnitude Diagram, Photographic Plates, Stellar Evolution, Subgiant Stars

Scientific paper

The luminosity function is derived experimentally with observations from a 4-m reflector and compared to theoretical values proposed by Simoda and Iben (1970) and by others. The star counts to the cluster center and to the tidal limit are derived for the measured region (2.5-8.0 arcmin) by using photometric results and counts from other authors. The observed luminosity function for M15 is consistent with the theoretical prediction for X of approximately 0.9 +/- 0.1. The value is found to be acceptably consistent with the Big Bang cosmology value of X = 0.76 and inconsistent with the theoretical results by Bertelli et al. (1979). Three candidate reasons for the discrepancy are set forth: (1) inaccuracies of published theoretical luminosity functions; (2) erroneous extrapolations of star counts; and/or (3) erroneous evolutionary theory for Population-II stars.

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