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2011MNRAS.416.2265A - Mon. Not. R. Astron. Soc., 416, 2265-2284 (2011/September-3)
Exploring the variable stars in the globular cluster NGC 5024 (M53): new RR Lyrae and SX Phoenicis stars.
ARELLANO FERRO A., FIGUERA JAIMES R., GIRIDHAR S., BRAMICH D.M., HERNANDEZ SANTISTEBAN J.V. and KUPPUSWAMY K.
Abstract (from CDS):
Out of the four probable SX Phe variables reported by Dékány & Kovács, the SX Phe nature is confirmed only for V80; V81 is an unlikely case while V82 and V83 remain as dubious cases. Previous misidentifications of three variables are corrected. Astrometric positions with an uncertainty of ∼0.3 arcsec are provided for all variables.
The light-curve Fourier decomposition of RR0 and RR1 is discussed, we find a mean metallicity of [Fe/H]=-1.92±0.06 in the scale of Zinn & West from 19 RR0 stars. The true distance moduli 16.36±0.05 and 16.28±0.07 and the corresponding distances 18.7±0.4 and 18.0±0.5 kpc are found from the RR0 and RR1 stars, respectively. These values are in agreement with the theoretical period–luminosity relations for RR Lyrae stars in the I band and with recent luminosity determinations for the RR Lyrae stars in the Large Magellanic Cloud (LMC).
The age of 13.25±0.50 Gyr, for NGC 5024, E(B - V) = 0.02 and the above physical parameters of the cluster, as indicated from the RR0 stars, produce a good isochrone fitting to the observed colour–magnitude diagram (CMD).
The period–luminosity (PL) relation for SX Phe stars in NGC 5024 in the V and I bands is discussed in the light of the 13 newly found SX Phe stars, and their pulsation mode is identified in most cases.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): stars: variables: RR Lyrae - globular clusters: individual: NGC 5024
VizieR on-line data: <Available at CDS (J/MNRAS/416/2265): table1.dat table2.dat table3.dat table6.dat table7.dat>
Nomenclature: Fig. 2, Tables 2, 6: Cl* NGC 5024 SAW VNNN (Nos 91-105) added. Table 7: [AFG2011] SN (Nos S1-S5).
Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.
Simbad objects: 106