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CCD time-series photometry of variable stars in globular clusters and the metallicity dependence of the horizontal branch luminosity

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dc.contributor.author Arellano Ferro, A
dc.contributor.author Bramich, D. M
dc.contributor.author Giridhar, S
dc.date.accessioned 2020-11-17T14:30:14Z
dc.date.available 2020-11-17T14:30:14Z
dc.date.issued 2017-04
dc.identifier.citation Revista Mexicana de Astronomica y Astrofisica, Vol. 53, No. 1, pp. 121-131 en_US
dc.identifier.issn 0185-1101
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7164
dc.description Open Access © Institute de Astronomia http://www.astroscu.unam.mx/rmaa/RMxAA..53-1/PDF/RMxAA..53-1_aarellano.pdf en_US
dc.description.abstract We describe and summarize the findings from our CCD time-seri es photom- etry of globular clusters (GCs) program and the use of differe nce image analysis (DIA) in the extraction of precise light curves down to V ≈ 19 mag in crowded regions. We have discovered approximately 250 variable sta rs in a sample of 23 selected GCs. The absolute magnitude and [Fe/H] for each ind ividual RR Lyrae is obtained via the Fourier decomposition of the light curve . An average of these parameters leads to the distance and metallicity of the host GCs. We present the mean [Fe/H], M V and distance for 26 GCs based exclusively on the RR Lyrae ligh t curve Fourier decomposition technique on an unprecedented homogeneous scale. We also discuss the luminosity dependence of the horizontal branch (HB) via the M V -[Fe/H] relation. We find that this relation should be consid ered separately for the RRab and RRc stars. en_US
dc.language.iso en en_US
dc.publisher Institute de Astronomia en_US
dc.subject Globular clusters: general en_US
dc.subject Stars: abundances en_US
dc.subject Stars: fundamental parameters en_US
dc.subject Stars: variables: RR Lyrae en_US
dc.title CCD time-series photometry of variable stars in globular clusters and the metallicity dependence of the horizontal branch luminosity en_US
dc.type Article en_US


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