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• W3102040147 abstract "We report the results of CCD V and R photometry of the RR Lyrae stars in M2. The periodicities of most variables are revised and new ephemerides are calculated. Light-curve decomposition of the RR Lyrae stars was carried out and the corresponding mean physical parameters [Fe/H]=−1.47, Teff= 6276 K, log L= 1.63 L⊙ and MV= 0.71 from nine RRab and [Fe/H]=−1.61, M= 0.54 M⊙, Teff= 7215 K, log L= 1.74 L⊙ and MV= 0.71 from two RRc stars were calculated. A comparison of the radii obtained from the above luminosity and temperature with predicted radii from non-linear convective models is discussed. The estimated mean distance to the cluster is 10.49 ± 0.15 kpc. These results place M2 correctly in the general globular cluster sequences for Oosterhoff type, mass, luminosity and temperature, all as a function of the metallicity. Mean relationships for M, log L/L⊙, Teff and MV as a function of [Fe/H] for a family of globular clusters are offered. These trends are consistent with evolutionary and structural notions on the horizontal branch. Eight new variables are reported." @default.
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• W3102040147 date "2006-10-11" @default.
• W3102040147 modified "2023-10-14" @default.
• W3102040147 title "CCD photometry of the globular cluster M2: RR Lyrae physical parameters and new variables" @default.
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• W3102040147 doi "https://doi.org/10.1111/j.1365-2966.2006.10742.x" @default.
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