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Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry

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dc.contributor.author Kains, N
dc.contributor.author Bramich, D. M
dc.contributor.author Ferro, A. A
dc.contributor.author Jaimes, R. F
dc.contributor.author Jorgensen, U. G
dc.contributor.author Giridhar, S
dc.contributor.author Penny, M. T
dc.contributor.author Alsubai, K. A
dc.contributor.author Andersen, J. M
dc.contributor.author Bozza, V
dc.contributor.author Browne, P
dc.contributor.author Burgdorf, M
dc.contributor.author Novati, S. C
dc.contributor.author Damerdji, Y
dc.contributor.author Diehl, C
dc.contributor.author Dodds, P
dc.contributor.author Dominik, M
dc.contributor.author Elyiv, A
dc.contributor.author Fang, X.-S
dc.contributor.author Giannini, E
dc.contributor.author Gu, S.-H
dc.contributor.author Hardis, S
dc.contributor.author Harpsoe, K
dc.contributor.author Hinse, T. C
dc.contributor.author Hornstrup, A
dc.contributor.author Hundertmark, M
dc.contributor.author Jessen-Hansen, J
dc.contributor.author Juncher, D
dc.contributor.author Kerins, E
dc.contributor.author Kjeldsen, H
dc.contributor.author Korhonen, H
dc.contributor.author Liebig, C
dc.contributor.author Lund, M. N
dc.contributor.author Lundkvist, M
dc.contributor.author Mancini, L
dc.contributor.author Martin, R
dc.contributor.author Mathiasen, M
dc.contributor.author Rabus, M
dc.contributor.author Rahvar, S
dc.contributor.author Ricci, D
dc.contributor.author Sahu, D. K
dc.contributor.author Scarpetta, G
dc.contributor.author Skottfelt, J
dc.contributor.author Snodgrass, C
dc.contributor.author Southworth, J
dc.contributor.author Surdej, J
dc.contributor.author Tregloan-Reed, J
dc.contributor.author Vilela, C
dc.contributor.author Wertz, O
dc.contributor.author Williams, A
dc.date.accessioned 2020-11-20T13:34:52Z
dc.date.available 2020-11-20T13:34:52Z
dc.date.issued 2013-07
dc.identifier.citation Astronomy & Astrophysics, Vol. 555, A36 en_US
dc.identifier.issn 0004-6361
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7344
dc.description Open Access © ESO This article has an erratum: http://dx.doi.org/10.1051/0004-6361/201321819e http://dx.doi.org/10.1051/0004-6361/201321819 en_US
dc.description.abstract Aims. We present the analysis of 26 nights of V and I time-series observations from 2011 and 2012 of the globular cluster M 30 (NGC 7099). We used our data to search for variable stars in this cluster and refine the periods of known variables; we then used our variable star light curves to derive values for the cluster’s parameters. Methods. We used difference image analysis to reduce our data to obtain high-precision light curves of variable stars. We then estimated the cluster parameters by performing a Fourier decomposition of the light curves of RR Lyrae stars for which a good period estimate was possible. We also derived an estimate for the age of the cluster by fitting theoretical isochrones to our colour-magnitude diagram (CMD). Results. Out of 13 stars previously catalogued as variables, we find that only 4 are bona fide variables. We detect two new RR Lyrae variables, and confirm two additional RR Lyrae candidates from the literature. We also detect four other new variables, including an eclipsing blue straggler system, and an SX Phoenicis star. This amounts to a total number of confirmed variable stars in M 30 of 12. We perform Fourier decomposition of the light curves of the RR Lyrae stars to derive cluster parameters using empirical relations. We find a cluster metallicity [Fe/H]ZW = −2.01 ± 0.04, or [Fe/H]UVES = −2.11 ± 0.06, and a distance of 8.32 ± 0.20 kpc (using RR0 variables), 8.10 kpc (using one RR1 variable), and 8.35 ± 0.42 kpc (using our SX Phoenicis star detection in M 30). Fitting isochrones to the CMD, we estimate an age of 13.0 ± 1.0 Gyr for M 30. en_US
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.subject Stars: variables: general en_US
dc.subject Stars: variables: RR Lyrae en_US
dc.subject Globular clusters: individual: M 30 (NGC 7099) en_US
dc.title Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry en_US
dc.type Article en_US

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