2010MNRAS.402..226A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET21:16:35

2010MNRAS.402..226A - Mon. Not. R. Astron. Soc., 402, 226-244 (2010/February-2)

CCD time-series photometry of the globular cluster NGC 5053: RR Lyrae, blue stragglers and SX Phoenicis stars revisited.

ARELLANO FERRO A., GIRIDHAR S. and BRAMICH D.M.

Abstract (from CDS):

We report the results of CCD V, r and I time-series photometry of the globular cluster NGC 5053. New times of maximum light are given for the eight known RR Lyrae stars in the field of our images, and their periods are revised. Their V light curves were Fourier decomposed to estimate their physical parameters. A discussion on the accuracy of the Fourier-based iron abundances, temperatures, masses and radii is given. New periods are found for the five known SX Phe stars, and a critical discussion of their secular period changes is offered. The mean iron abundance for the RR Lyrae stars is found to be [Fe/H] ∼ -1.97±0.16 and lower values are not supported by the present analysis. The absolute magnitude calibrations of the RR Lyrae stars yield an average true distance modulus of 16.12±0.04 or a distance of 16.7±0.3 kpc. Comparison of the observational colour magnitude diagram (CMD) with theoretical isochrones indicates an age of 12.5±2.0 Gyr for the cluster. A careful identification of all reported blue stragglers (BS) and their V, I magnitudes leads to the conclusion that BS12, BS22, BS23 and BS24 are not BS. On the other hand, three new BS are reported. Variability was found in seven BS, very likely of the SX Phe type in five of them, and in one red giant star. The new SX Phe stars follow established Period-Luminosity relationships and indicate a distance in agreement with the distance from the RR Lyrae stars.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): stars: horizontal branch - stars: individual: RR Lyrae - globular clusters: individual: NGC 5053

VizieR on-line data: <Available at CDS (J/MNRAS/402/226): stars.dat table2.dat>

Nomenclature: Table 11: Cl* NGC 5053 NC NN (Nos 27-31) added.

Simbad objects: 45

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Number of rows : 45

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14998 1
2 2MASS J13161237+1741466 RR* 13 16 12.3783702978 +17 41 46.746356362   16.88 16.67   16.14 ~ 12 0
3 Cl* NGC 5053 SMBS 15 SX* 13 16 17.26 +17 40 29.4   19.92 19.60   19.34 ~ 10 0
4 Cl* NGC 5053 SMBS 14 SX* 13 16 17.83 +17 40 52.1   19.76 19.46   19.23 ~ 10 0
5 2MASS J13161971+1744383 RR* 13 16 19.7430278356 +17 44 38.380709520   16.93 16.53   16.34 ~ 12 0
6 Cl* NGC 5053 NC 29 SX* 13 16 21.4846465500 +17 43 39.981261270   19.6 19.808 20.1 19.40 ~ 2 0
7 Cl* NGC 5053 SM 282 SX* 13 16 23.15 +17 42 12.5   18.84 18.75   18.38 ~ 4 0
8 Cl* NGC 5053 SMBS 13 SX* 13 16 23.87 +17 42 00.9   19.91 19.58   19.26 ~ 11 0
9 Cl* NGC 5053 SMBS 11 SX* 13 16 25.30 +17 43 48.7   19.83 19.57   19.28 ~ 11 0
10 Cl* NGC 5053 NC 30 SX* 13 16 26.09 +17 43 29.1     19.885   19.57 ~ 2 0
11 NGC 5053 4 V* 13 16 27.0531299603 +17 39 28.534919189   17.43 16.71   15.78 ~ 3 0
12 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 542 0
13 Cl* NGC 5053 SAW V4 RR* 13 16 28.0308494501 +17 39 56.303653337           ~ 12 0
14 Cl* NGC 5053 SMBS 5 SX* 13 16 28.77 +17 43 34.8   19.00 18.97   18.72 ~ 5 0
15 Cl* NGC 5053 SMBS 7 SX* 13 16 32.23 +17 42 09.5   19.62 19.39   19.12 ~ 11 0
16 Cl* NGC 5053 SAW V10 RR* 13 16 32.5481887182 +17 42 46.381602644           ~ 7 0
17 Cl* NGC 5053 BAA V8 RR* 13 16 34.0445435675 +17 42 40.117850919   16.84 16.64   16.24 ~ 12 0
18 2MASS J13163461+1743071 RR* 13 16 34.6387360788 +17 43 07.217209542   16.64 15.71   16.26 ~ 10 0
19 2MASS J13163562+1744159 RR* 13 16 35.6363217514 +17 44 15.742889098   16.88 16.62   16.11 ~ 14 0
20 Cl* NGC 5053 SMBS 19 SX* 13 16 37.77 +17 43 49.5   19.88 19.95   19.55 ~ 5 0
21 USNO-A2.0 1050-06884873 * 13 16 40.3145284148 +17 37 37.682143188   18.5 19.263 19.2   ~ 1 0
22 2MASS J13164121+1738107 RR* 13 16 41.2255387279 +17 38 10.487691303   17.15 16.75     ~ 15 0
23 Cl* NGC 5053 SMBS 27 SX* 13 16 43.51 +17 43 46.7     19.34   19.14 ~ 2 0
24 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 727 0
25 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 262 0
26 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2923 0
27 Cl* NGC 5053 NC 9 * ~ ~   19.08 18.89     ~ 4 0
28 Cl* NGC 5053 NC 1 * ~ ~   18.18 17.98     ~ 4 0
29 Cl* NGC 5053 NC 10 * ~ ~   19.13 18.86     ~ 4 0
30 Cl* NGC 5053 NC 12 * ~ ~   20.20 19.96     ~ 4 0
31 Cl* NGC 5053 NC 16 * ~ ~   20.17 19.86     ~ 4 0
32 Cl* NGC 5053 NC 17 * ~ ~   19.50 19.30     ~ 4 0
33 Cl* NGC 5053 NC 18 * ~ ~   19.89 19.58     ~ 4 0
34 Cl* NGC 5053 NC 2 * ~ ~   18.60 18.34     ~ 4 0
35 Cl* NGC 5053 NC 20 * ~ ~   19.37 19.17     ~ 4 0
36 Cl* NGC 5053 NC 21 * ~ ~   19.09 18.85     ~ 4 0
37 Cl* NGC 5053 NC 22 * ~ ~   19.73 19.38     ~ 4 0
38 Cl* NGC 5053 NC 23 * ~ ~   19.65 19.65     ~ 4 0
39 Cl* NGC 5053 NC 24 * ~ ~   18.87 18.26     ~ 4 0
40 Cl* NGC 5053 NC 26 * ~ ~   19.38 19.03     ~ 3 0
41 Cl* NGC 5053 NC 27 * ~ ~           ~ 1 0
42 Cl* NGC 5053 NC 3 * ~ ~   18.85 18.54     ~ 4 0
43 Cl* NGC 5053 NC 4 * ~ ~   18.57 18.29     ~ 4 0
44 Cl* NGC 5053 NC 6 * ~ ~   18.65 18.55     ~ 4 0
45 Cl* NGC 5053 NC 8 * ~ ~   19.33 19.16     ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-21:16:35

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