Photographic photometry of RR Lyrae variables in the globular cluster M15

Details Photographic photometry of RR Lyrae variables in the globular cluster M15 Photographic photometry of RR Lyrae variables in the globular cluster M15

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.209..765b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 209, Aug. 15, 1984, p. 765-824. Research supported by t

Astronomy and Astrophysics

Astronomy

98

Cepheid Variables, Globular Clusters, Light Curve, Stellar Evolution, Stellar Spectrophotometry, Abundance, Astronomical Catalogs, Astronomical Photography, Mass To Light Ratios, Stellar Color, Stellar Magnitude, Stellar Oscillations

Scientific paper

Light curves in B and V bands are presented for 56 RR Lyrae variables in the Oosterhoff Group II globular cluster M15. Correlations between light curves parameters are obtained and their significance is discussed. An accurate assessment of the sources of error in the period-color relation has permitted the prediction of the range of masses among the variables with a dispersion of about 0.025 solar mass. The period color relation was used to derive a mass-to-light ratio of -1.92 (+ or - 0.03). The luminosity observed in M15 implies an age a few billion years less than current estimates. The morphology of the SG tracks indicates that many of the RR Lyraes in M15 begin their horizontal evolution within the instability strip, spending much longer in the center of the strip than M3-like clusters which evolve more rapidly bluewards across the strip.

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