Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..214g&link_type=abstract
Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
In the present study, V and R images of M15 were obtained in two seasons during the year 2000 and 2001, respectively. These images were taken using the 1.5 m telescope of San Pedro Mártir Observatory, in Baja California, México. The telescope was equipped with a CCD Tektronix of 1024 x 1024 pixels with a size of 24 μ^2. In this work, results of CCD photometry are reported for 33 RR Lyrae star known in the M15. The periodicities of some variables have been recalculated and new ephemeredes are given. The Blazhko effect, reported previously for the V12 star, has not been detected. Through the use of the technique of Fourier decomposition of the light curves, the physical parameters of the type RRab and RRc variables have been estimated. The cluster is Oosterhoff type II and the values determined for the iron content and the distance are [Fe/H] = -1.98 ± 0.24 y d = 8.67 ± 0.41 kpc, respectively. The mean values of the physical parameters determined for the RR Lyrae stars, place the cluster correctly in the sequences Oosterhoff type - metallicity and metallicity - effective temperature, valid for globular clusters. These sequences suggest that the origin of the Oosterhoff dichotomy is of evolutive nature.
Arellano Ferro Armando
García Lugo G.
Rosenzweig Patricia
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