2013A&A...555A..36K


Query : 2013A&A...555A..36K

2013A&A...555A..36K - Astronomy and Astrophysics, volume 555A, 36-36 (2013/7-1)

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

KAINS N., BRAMICH D.M., ARELLANO FERRO A., FIGUERA JAIMES R., JORGENSEN U.G., GIRIDHAR S., PENNY M.T., ALSUBAI K.A., ANDERSEN J.M., BOZZA V., BROWNE P., BURGDORF M., CALCHI NOVATI S., DAMERDJI Y., DIEHL C., DODDS P., DOMINIK M., ELYIV A., FANG X.-S., GIANNINI E., GU S.-H., HARDIS S., HARPSOE K., HINSE T.C., HORNSTRUP A., HUNDERTMARK M., JESSEN-HANSEN J., JUNCHER D., KERINS E., KJELDSEN H., KORHONEN H., LIEBIG C., LUND M.N., LUNDKVIST M., MANCINI L., MARTIN R., MATHIASEN M., RABUS M., RAHVAR S., RICCI D., SAHU K., SCARPETTA G., SKOTTFELT J., SNODGRASS C., SOUTHWORTH J., SURDEJ J., TREGLOAN-REED J., VILELA C., WERTZ O. and WILLIAMS A.

Abstract (from CDS):

We present the analysis of 26 nights of V and I time-series observations from 2011 and 2012 of the globular cluster M30 (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. 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). 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 M30 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±0.20kpc (using RR0 variables), 8.10kpc (using one RR1 variable), and 8.35±0.42kpc (using our SX Phoenicis star detection in M30). Fitting isochrones to the CMD, we estimate an age of 13.0±1.0Gyr for M30.

Abstract Copyright:

Journal keyword(s): stars: variables: general - stars: variables: RR Lyrae - globular clusters: individual: M30 (NGC7099)

VizieR on-line data: <Available at CDS (J/A+A/555/A36): stars.dat table2.dat>

Nomenclature: Table 3: Cl* NGC 7099 Saw VNN (Nos V14-V21) added.

Errata: erratum vol. 588, art.2 (2016)

Simbad objects: 31

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Number of rows : 31
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 4913 PM* 00 51 21.7540457400 +18 44 21.292416060 11.621 10.43 9.197 8.457 7.834 K6V 76 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16065 1
3 BD-06 1339 PM* 05 53 00.2846861073 -05 59 41.441196105 12.27 11.041 9.693 8.855 8.099 K7V/M0V 79 1
4 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 773 0
5 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2375 0
6 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 295 0
7 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 809 0
8 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 3025 0
9 Cl* NGC 7099 SAW V4 CV* 21 39 58.4496037344 -23 11 43.654102116     19.1     ~ 10 0
10 Cl* NGC 7099 SAW V3 RR* 21 40 15.0461915040 -23 11 28.300752204   15.48 14.78 15.26   ~ 8 0
11 Cl* NGC 7099 SAW V14 RR? 21 40 21.1035062904 -23 11 31.258874436           ~ 2 0
12 Cl* NGC 7099 SAW V15 RR? 21 40 21.7984349136 -23 10 50.585231532           ~ 3 0
13 Cl* NGC 7099 SAW V18 BS* 21 40 21.88 -23 09 32.4     17.68   17.46 ~ 3 0
14 Cl* NGC 7099 SAW V19 * 21 40 22.09 -23 10 43.3           ~ 1 0
15 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 981 0
16 Cl* NGC 7099 SAW V17 * 21 40 23.66 -23 11 01.1           ~ 1 0
17 Cl* NGC 7099 SAW V1 RR* 21 40 24.2500548288 -23 11 46.915859400   15.65 14.68     ~ 6 0
18 Cl* NGC 7099 SAW V16 HB* 21 40 24.8124917112 -23 11 49.202086776     15.18   14.84 ~ 2 0
19 Cl* NGC 7099 SAW V2 RR* 21 40 26.4481831008 -23 12 51.614039520   15.48 14.96 15.21   ~ 8 0
20 Cl* NGC 7099 SAW V20 * 21 40 29.83 -23 11 05.9           ~ 1 0
21 Cl* NGC 7099 SAW V21 * 21 40 47.7985308048 -23 10 24.376284732           ~ 1 0
22 Cl* NGC 7099 SAW V6 * ~ ~           ~ 2 0
23 NAME Galactic Bulge reg ~ ~           ~ 3870 0
24 Cl* NGC 7099 SAW V13 * ~ ~           ~ 2 0
25 Cl* NGC 7099 SAW V10 * ~ ~           ~ 2 0
26 Cl* NGC 7099 SAW V7 * ~ ~           ~ 2 0
27 Cl* NGC 7099 SAW V8 * ~ ~           ~ 2 0
28 Cl* NGC 7099 SAW V11 * ~ ~           ~ 2 0
29 Cl* NGC 7099 SAW V5 * ~ ~           ~ 2 0
30 Cl* NGC 7099 SAW V12 * ~ ~           ~ 2 0
31 Cl* NGC 7099 SAW V9 * ~ ~           ~ 2 0

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2022.07.03-10:26:32

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