2011MNRAS.416.2265A

Query : 2011MNRAS.416.2265A

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):

We report CCD V and I time series photometry of the globular cluster NGC 5024 (M53). The technique of difference image analysis has been used which enables photometric precisions better than 10 mmag for stars brighter than V∼ 18.5 mag even in the crowded central regions of the cluster. The high photometric precision has resulted in the discovery of two new RR1 stars and 13 SX Phe stars. A detailed identification chart is given for all the variable stars in the field of our images of the cluster. Periodicities were calculated for all RR Lyrae and SX Phe stars and a critical comparison is made with previous determinations.

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.

Based on observations collected at the Indian Astrophysical Observatory, Hanle, India.


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).

Simbad objects: 106

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Number of rows : 106
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
2 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
3 Cl* NGC 5024 SAW V84 RG* 13 12 36.1753655928 +18 07 31.974328488   15.481 14.77 14.731 13.591 ~ 21 0
4 Cl* NGC 5024 SAW V39 * 13 12 38.75 +18 13 31.2           ~ 3 0
5 Cl* NGC 5024 RLB 899 RR* 13 12 39.0820717032 +18 05 42.289234584     16.888   16.362 ~ 24 0
6 Cl* NGC 5024 SAW V93 SX* 13 12 40.00 +18 08 39.0     18.84   18.54 ~ 3 0
7 Cl* NGC 5024 RLB 544 RR* 13 12 40.3428513504 +18 11 53.940451020     16.848   16.426 ~ 14 0
8 Cl* NGC 5024 RLB 860 RR* 13 12 41.4240836712 +18 07 23.564778996     16.856   16.306 ~ 24 0
9 Cl* NGC 5024 SAW V94 SX* 13 12 42.11 +18 07 39.8     19.75   19.42 ~ 2 0
10 Cl* NGC 5024 SAW V33 RR* 13 12 43.8614927160 +18 10 12.913338396       17.090   ~ 17 0
11 Cl* NGC 5024 RLB 842 RR* 13 12 43.8870020376 +18 07 26.227658064   17.3 16.69   16.417 ~ 17 0
12 Cl* NGC 5024 RLB 928 RR* 13 12 45.3858072792 +18 09 01.927039464           ~ 20 0
13 Cl* NGC 5024 SAW V34 RR* 13 12 45.7037551752 +18 06 25.971558012     16.928   16.614 ~ 11 0
14 Cl* NGC 5024 RLB 558 RR* 13 12 45.7241145960 +18 10 55.420834548     16.837   16.374 ~ 21 0
15 Cl* NGC 5024 RLB 569 RR* 13 12 46.1951386704 +18 06 39.065653980     16.59     ~ 16 0
16 Cl* NGC 5024 SAW V79 SX* 13 12 46.60 +18 11 36.9       19.183   ~ 5 0
17 [AFG2011] S1 BS* 13 12 47.00 +18 10 22.8     19.977   19.922 ~ 1 0
18 Cl* NGC 5024 SAW V24 RR* 13 12 47.2875570192 +18 09 32.328501552           ~ 12 0
19 Cl* NGC 5024 RLB 695 RR* 13 12 47.7369704808 +18 08 35.768280732     16.712   16.296 ~ 15 0
20 Cl* NGC 5024 SAW V95 SX* 13 12 47.94 +18 09 55.2     19.56   19.27 ~ 2 0
21 [SS2011] SX3 SX* 13 12 48.27 +18 14 34.6     18.76 18.7855 18.45 ~ 4 0
22 [SS2011] SX2 SX* 13 12 48.29 +18 13 18.9     19.59 19.6018 19.38 ~ 5 0
23 Cl* NGC 5024 SAW V98 SX* 13 12 48.67 +18 09 35.9     19.64   19.29 ~ 2 0
24 Cl* NGC 5024 SAW V18 RR* 13 12 48.6796028592 +18 10 13.079658036       19.567   ~ 14 0
25 [AFG2011] S2 BS* 13 12 49.30 +18 10 05.6     18.998   18.678 ~ 1 0
26 Cl* NGC 5024 SXP 2 SX* 13 12 49.71 +18 07 26.0   19.23 18.92 19.054   ~ 6 0
27 Cl* NGC 5024 SAW V78 SX* 13 12 49.87 +18 08 56.1       18.1171   ~ 5 0
28 Cl* NGC 5024 SAW V83 * 13 12 50.10 +18 07 42.9       18.749   ~ 4 0
29 Cl* NGC 5024 RLB 552 RR* 13 12 50.2838513256 +18 07 00.741045432     16.59   16.495 ~ 18 0
30 Cl* NGC 5024 RLB 624 RR* 13 12 50.4230100336 +18 12 24.542278524     16.791   16.419 ~ 12 0
31 Cl* NGC 5024 SAW V42 RR* 13 12 50.5527590472 +18 10 19.941037068       18.499   ~ 19 0
32 2MASS J13125069+1810396 RG* 13 12 50.6977816224 +18 10 39.577288260     13.962   12.605 ~ 5 0
33 [AFG2011] S3 BS* 13 12 51.00 +18 10 04.3     18.163   18.267 ~ 1 0
34 Cl* NGC 5024 RLB 818 RR* 13 12 51.3766149048 +18 07 45.345228996     16.848   16.401 ~ 21 0
35 Cl* NGC 5024 KRA 6 RR* 13 12 51.6689432136 +18 10 00.492431376           ~ 13 0
36 Cl* NGC 5024 SAW V22 Pe* 13 12 51.9691401611 +18 05 16.563556674           ~ 4 0
37 Cl* NGC 5024 SAW V37 RR* 13 12 52.2843787536 +18 11 05.268563880           ~ 18 0
38 Cl* NGC 5024 SAW V64 RR* 13 12 52.5229024104 +18 10 12.425633544           ~ 10 0
39 Cl* NGC 5024 SAW V86 RG* 13 12 52.7226308544 +18 10 27.978544488     14.08     ~ 5 0
40 Cl* NGC 5024 SAW V90 SX* 13 12 52.77 +18 04 58.4   19.22 18.96     ~ 5 0
41 [SS2011] SX9 1 SX* 13 12 52.91 +18 10 35.8     18.46 18.5738 18.44 ~ 4 0
42 Cl* NGC 5024 SAW V43 RR* 13 12 53.0856927234 +18 10 55.380698938           ~ 18 0
43 Cl* NGC 5024 SAW V100 SX* 13 12 53.42 +18 14 46.2     19.26   18.97 ~ 3 0
44 Cl* NGC 5024 KRA 5 RR* 13 12 53.4590469600 +18 10 36.498432216           ~ 10 0
45 Cl* NGC 5024 SAW V91 RR* 13 12 53.6218474104 +18 10 13.458944856           ~ 4 0
46 [SS2011] SX11 SX* 13 12 53.65 +18 08 57.9     19.21 19.3140 19.03 ~ 5 0
47 Cl* NGC 5024 KRA 7 RR* 13 12 53.6938394616 +18 09 25.934613228           ~ 11 0
48 [AFG2011] S4 BS* 13 12 53.90 +18 09 15.1     19.866   19.56 ~ 1 0
49 Cl* NGC 5024 SAW V62 RR* 13 12 53.9992578096 +18 10 29.814556620           ~ 7 0
50 Cl* NGC 5024 KRA 4 RR* 13 12 54.381 +18 10 31.65           ~ 9 0
51 Cl* NGC 5024 SAW V71 RR* 13 12 54.3921224405 +18 09 53.893833786           ~ 7 0
52 Cl* NGC 5024 SAW V46 RR* 13 12 54.5370535762 +18 10 37.006020536           ~ 18 0
53 [SS2011] SX14 SX* 13 12 54.76 +18 09 37.7     18.58 18.6844 18.26 ~ 4 0
54 Cl* NGC 5024 SAW V92 RR* 13 12 54.9092376408 +18 10 50.187287172           ~ 4 0
55 Cl* NGC 5024 SAW V45 RR* 13 12 55.1600974464 +18 09 27.363295080           ~ 19 0
56 Cl* NGC 5024 SAW V61 RR* 13 12 55.212 +18 10 10.31           ~ 7 0
57 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
58 Cl* NGC 5024 KRA 8 RR* 13 12 55.5601859088 +18 09 58.259548224       16.702   ~ 12 0
59 Cl* NGC 5024 KRA 9 RR* 13 12 55.5977644752 +18 09 30.930057576           ~ 12 0
60 Cl* NGC 5024 KRA 3 RR* 13 12 55.806 +18 10 36.02       17.278   ~ 11 0
61 Cl* NGC 5024 SAW V40 RR* 13 12 55.8607307784 +18 11 54.667442148           ~ 14 0
62 Cl* NGC 5024 KRA 2 RR* 13 12 55.9171133736 +18 10 36.949075428           ~ 12 0
63 Cl* NGC 5024 SAW V72 RR* 13 12 55.9403616102 +18 09 52.232262368           ~ 8 0
64 [AFG2011] S5 BS* 13 12 56.00 +18 09 14.4     18.084   18.400 ~ 1 0
65 Cl* NGC 5024 SAW V63 RR* 13 12 56.2988126640 +18 10 00.715890972           ~ 9 0
66 Cl* NGC 5024 RLB 469 RR* 13 12 56.3408877360 +18 07 13.760968764     16.971   16.392 ~ 23 0
67 Cl* NGC 5024 SAW V82 * 13 12 56.50 +18 13 10.0       18.864   ~ 4 0
68 Cl* NGC 5024 KRA 10 RS* 13 12 56.6678751648 +18 09 20.775085920           ~ 11 0
69 Cl* NGC 5024 SAW V41 RR* 13 12 56.7564886800 +18 11 08.413897812           ~ 16 0
70 Cl* NGC 5024 KRA 11 RR* 13 12 57.0005518032 +18 09 36.558084024           ~ 16 0
71 Cl* NGC 5024 RLB 668 RR* 13 12 57.1401640872 +18 07 40.482305724     16.17   16.192 ~ 17 0
72 Cl* NGC 5024 SAW V80 SX* 13 12 57.40 +18 10 15.2       17.915   ~ 5 0
73 Cl* NGC 5024 KRA 1 RR* 13 12 57.5888398268 +18 10 49.537736038       19.842   ~ 10 0
74 [SS2011] SX19 SX* 13 12 58.32 +18 08 41.2     19.48 19.3035 19.17 ~ 4 0
75 [SS2011] W9 SX* 13 12 59.00 +18 10 22.0     19.34 19.369 19.17 ~ 4 0
76 Cl* NGC 5024 SAW V31 RR* 13 12 59.5675108800 +18 10 04.823864148           ~ 18 0
77 Cl* NGC 5024 RLB 884 RR* 13 13 00.0765218640 +18 09 25.053246180           ~ 18 0
78 Cl* NGC 5024 RLB 849 RR* 13 13 00.4260277248 +18 11 05.014079484           ~ 19 0
79 Cl* NGC 5024 RLB 441 RR* 13 13 00.8632576128 +18 11 29.933116368     16.69     ~ 22 0
80 ZTF J131301.01+181009.5 LP* 13 13 01.0228571664 +18 10 09.553093176     14.08     ~ 9 0
81 [SS2011] SX22 SX* 13 13 01.92 +18 12 30.4     19.61 19.5604 19.30 ~ 4 0
82 Cl* NGC 5024 SXP 3 SX* 13 13 01.92 +18 10 13.2   19.51 19.25 19.356   ~ 5 0
83 Cl* NGC 5024 RLB 782 RR* 13 13 02.3383396440 +18 08 35.971100232     16.825   16.434 ~ 14 0
84 Cl* NGC 5024 RLB 538 RR* 13 13 02.4200626584 +18 12 37.696450068     16.943   16.501 ~ 16 0
85 Cl* NGC 5024 SAW V81 SX* 13 13 02.6954185896 +18 06 29.630717424   16.6 17.454 16.3 16.639 ~ 4 0
86 Cl* NGC 5024 RLB 757 RR* 13 13 03.2872251240 +18 15 10.338228612     16.879   16.465 ~ 15 0
87 Cl* NGC 5024 SXP 1 SX* 13 13 03.38 +18 09 25.3   19.09 18.81 18.927   ~ 6 0
88 Cl* NGC 5024 RLB 750 RR* 13 13 03.9044305056 +18 10 19.948004940     16.819   16.297 ~ 20 0
89 Cl* NGC 5024 RLB 756 RR* 13 13 04.2608086704 +18 08 46.958663076     16.782   16.194 ~ 16 0
90 Cl* NGC 5024 RLB 779 RR* 13 13 04.4104593672 +18 10 37.312693680     16.78   16.224 ~ 21 0
91 Cl* NGC 5024 SXP 7 SX* 13 13 05.01 +18 08 36.1   19.74 19.52 19.434   ~ 6 0
92 Cl* NGC 5024 RLB 560 RR* 13 13 07.0126262664 +18 09 26.306783172     16.880   16.443 ~ 17 0
93 Cl* NGC 5024 SXP 5 SX* 13 13 08.15 +18 07 38.4   19.69 19.44 19.435   ~ 6 0
94 Cl* NGC 5024 SXP 6 SX* 13 13 09.44 +18 09 40.1   19.67 19.37 19.455   ~ 6 0
95 Cl* NGC 5024 RLB 593 RR* 13 13 12.3847606608 +18 13 55.386643152     16.78   16.552 ~ 17 0
96 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
97 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
98 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
99 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
100 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
101 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
102 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
103 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
104 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 348 0
105 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
106 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

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