2009A&A...507..803D


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.20CET14:41:35

2009A&A...507..803D - Astronomy and Astrophysics, volume 507, 803-815 (2009/11-4)

Study of globular cluster M53: new variables, distance, metallicity.

DEKANY I. and KOVACS G.

Abstract (from CDS):

We study the variable star content of the globular cluster M53 to compute the physical parameters of the constituting stars and the distance of the cluster. Covering two adjacent seasons in 2007 and 2008, new photometric data are gathered for 3048 objects in the field of M53. By using the OIS (optimal image subtraction) method and subsequently TFA (trend filtering algorithm), we search for variables in the full sample by using discrete Fourier transformation and box-fitting least squares methods. We select variables based on the statistics related to these methods combined with visual inspection. We identified 12 new variables (2 RR Lyrae stars, 7 short periodic stars - 3 of them are SX Phe stars - and 3 long-period variables). No eclipsing binaries were found in the present sample. Except for the 3 (hitherto unknown) Blazhko RR Lyrae (two RRab and an RRc) stars, no multiperiodic variables were found. We showed that after proper period shift, the PLC (period-luminosity-color) relation for the first overtone RR Lyrae sample tightly follows the one spanned by the fundamental stars. Furthermore, the slope is in agreement with that derived from other clusters. Based on the earlier Baade-Wesselink calibration of the PLC relations, the derived reddening-free distance modulus of M53 is 16.31±0.04mag, corresponding to a distance modulus of 18.5mag for the Large Magellanic Cloud. From the Fourier parameters of the RRab stars we obtained an average iron abundance of -1.58±0.03 (error of the mean). This is ∼0.5dex higher than the overall abundance of the giants as given in the literature and derived in this paper from the three-color photometry of giants. We suspect that the source of this discrepancy (observable also in other, low-metallicity clusters) is the lack of a sufficient number of low-metallicity objects in the calibrating sample of the Fourier method.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: M53 - methods: data analysis - stars: variables: general - stars: variables: RR Lyr - stars: oscillations - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/507/803): stars.dat rrlvcoe.dat flux/* fluxtfa/* mag/*>

Nomenclature: Cl* NGC 5024 SAW VNN (Nos 71-86) added.

Simbad objects: 118

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Number of rows : 118

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 V* W Tuc RR* 00 58 09.7043505234 -63 23 44.370517140   11.81 11.60     kA2hA5 97 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6   7.97 6.58     ~ 897 0
3 V* X Ari RR* 03 08 30.8844194016 +10 26 45.221908919 9.45 9.25 8.97     F0.5 260 0
4 [V84] 13 GrG 03 46.9 +68 06           ~ 2 0
5 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1209 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14350 1
7 V* BB Pup RR* 08 24 22.6433556297 -19 32 31.406624731           kA5:hF2 66 0
8 V* SS Leo RR* 11 33 54.4935493540 -00 02 00.035385354   10.52       F1 142 0
9 V* SW Dra RR* 12 17 46.6286160546 +69 30 38.234300209   10.87 10.55     A7-F8 135 0
10 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 856 0
11 CRTS J131235.7+180519 RR* 13 12 35.7480998762 +18 05 20.171887242     16.66   16.451 ~ 8 0
12 2MASS J13123617+1807320 RG* 13 12 36.1753487717 +18 07 31.975344491     14.766   13.591 ~ 9 0
13 2MASS J13123737+1808232 RG* 13 12 37.3658145695 +18 08 23.156416245   15.40 14.08   12.70 ~ 7 0
14 Cl* NGC 5024 RLB 899 RR* 13 12 39.0821432450 +18 05 42.288324253     16.888   16.362 ~ 13 0
15 Cl* NGC 5024 RLB 544 RR* 13 12 40.3424314922 +18 11 53.940859206     16.848   16.426 ~ 7 0
16 Cl* NGC 5024 RLB 860 RR* 13 12 41.4243134993 +18 07 23.565365493     16.856   16.306 ~ 11 0
17 Cl* NGC 5024 SAW V28 RR* 13 12 42.1132625482 +18 16 37.722995212     16.875   16.330 ~ 11 0
18 CRTS J131243.8+180726 RR* 13 12 43.8866782662 +18 07 26.228013180   17.3 16.69   16.417 ~ 9 0
19 Cl* NGC 5024 SAW V33 RR* 13 12 43.940 +18 10 09.27     14.41     ~ 9 0
20 Cl* NGC 5024 RLB 928 RR* 13 12 45.408 +18 09 02.01           ~ 10 0
21 Cl* NGC 5024 SAW V34 RR* 13 12 45.7037360340 +18 06 25.972338968     16.928   16.614 ~ 6 0
22 Cl* NGC 5024 RLB 558 RR* 13 12 45.7244303898 +18 10 55.420365228     16.837   16.374 ~ 10 0
23 CRTS J131246.1+180639 RR* 13 12 46.1951934425 +18 06 39.067274675     16.59     ~ 8 0
24 Cl* NGC 5024 SAW V79 SX* 13 12 46.60 +18 11 36.9       19.183   ~ 4 0
25 Cl* NGC 5024 SAW V24 RR* 13 12 47.28 +18 09 32.3           ~ 7 0
26 2MASS J13124774+1808358 RR* 13 12 47.746 +18 08 35.83     16.712   16.296 ~ 8 0
27 2MASS J13124794+1806320 RG* 13 12 47.9380735329 +18 06 32.058841970   15.92 14.88   13.74 ~ 9 0
28 2MASS J13124819+1812465 RG* 13 12 48.1900751502 +18 12 46.486025389   15.67 14.59   13.39 ~ 7 0
29 2MASS J13124860+1814157 RG* 13 12 48.6007466367 +18 14 15.601112917   15.54 14.34   13.06 ~ 3 0
30 2MASS J13124868+1810128 RR* 13 12 48.681 +18 10 12.82           ~ 7 0
31 Cl* NGC 5024 SXP 2 SX* 13 12 49.71 +18 07 26.0   19.23 18.92 19.054   ~ 5 0
32 2MASS J13124986+1808561 SX* 13 12 49.87 +18 08 56.1       18.1171   ~ 5 0
33 Cl* NGC 5024 SAW V83 * 13 12 50.10 +18 07 42.9       18.749   ~ 4 0
34 CRTS J131250.2+180700 RR* 13 12 50.2842549756 +18 07 00.739757617     16.59   16.495 ~ 8 0
35 Cl* NGC 5024 RLB 624 RR* 13 12 50.4231905872 +18 12 24.540089953     16.791   16.419 ~ 6 0
36 2MASS J13125043+1808536 RG* 13 12 50.4303770184 +18 08 53.659205127   15.40 14.11   12.74 ~ 3 0
37 2MASS J13125058+1810195 RR* 13 12 50.586 +18 10 19.55       18.499   ~ 9 0
38 2MASS J13125069+1810396 RG* 13 12 50.6978358991 +18 10 39.577661591     13.962   12.605 ~ 4 0
39 [SHM2017] J198.21410+18.12926 RR* 13 12 51.3767150964 +18 07 45.344418921     16.848   16.401 ~ 10 0
40 Cl* NGC 5024 KRA 6 RR* 13 12 51.66 +18 10 00.5           ~ 7 0
41 2MASS J13125227+1811050 RR* 13 12 52.28 +18 11 05.0           ~ 8 0
42 2MASS J13125254+1810125 RR* 13 12 52.55 +18 10 12.6           ~ 6 0
43 Cl* NGC 5024 SAW V86 RG* 13 12 52.730 +18 10 28.01     14.08     ~ 4 0
44 Cl* NGC 5024 SAW V90 SX* 13 12 52.77 +18 04 58.4   19.22 18.96     ~ 4 0
45 2MASS J13125306+1810552 RR* 13 12 53.07 +18 10 55.3           ~ 8 0
46 Cl* NGC 5024 KRA 5 RR* 13 12 53.45 +18 10 36.6           ~ 7 0
47 Cl* NGC 5024 KRA 7 RR* 13 12 53.69 +18 09 26.0           ~ 7 0
48 2MASS J13125400+1810302 RR* 13 12 54.00 +18 10 30.3           ~ 5 0
49 2MASS J13125438+1810316 RR* 13 12 54.381 +18 10 31.65           ~ 7 0
50 Cl* NGC 5024 SAW V71 RR* 13 12 54.50 +18 09 54.3           ~ 4 0
51 Cl* NGC 5024 SAW V46 RR* 13 12 54.53 +18 10 37.1           ~ 8 0
52 2MASS J13125517+1809274 RR* 13 12 55.170 +18 09 27.41           ~ 9 0
53 2MASS J13125521+1810103 RR* 13 12 55.212 +18 10 10.31           ~ 5 0
54 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 689 0
55 2MASS J13125532+1809420 IR 13 12 55.320 +18 09 42.04     13.67     ~ 3 0
56 NGC 5024 4416 * 13 12 55.545 +18 10 10.01     14.08     ~ 8 0
57 Cl* NGC 5024 SAW V57 RR* 13 12 55.56 +18 09 58.2       16.702   ~ 8 1
58 2MASS J13125559+1813138 RG* 13 12 55.5923180213 +18 13 13.845596974   15.79 14.74   13.59 ~ 3 0
59 2MASS J13125561+1809302 RR* 13 12 55.62 +18 09 30.2           ~ 8 0
60 Cl* NGC 5024 SAW V48 * 13 12 55.727 +18 10 15.47           ~ 2 0
61 Cl* NGC 5024 SAW V72 RR* 13 12 55.80 +18 09 50.6           ~ 5 0
62 2MASS J13125580+1810360 RR* 13 12 55.806 +18 10 36.02       17.278   ~ 9 0
63 Cl* NGC 5024 SAW V40 RR* 13 12 55.8606094036 +18 11 54.670441827           ~ 7 0
64 Cl* NGC 5024 KRA 2 RR* 13 12 55.91 +18 10 37.0           ~ 8 0
65 2MASS J13125616+1810194 RG* 13 12 56.1650203595 +18 10 19.348190229     13.85     ~ 4 0
66 Cl* NGC 5024 SAW V63 RR* 13 12 56.20 +18 10 02.8           ~ 6 0
67 Cl* NGC 5024 RLB 469 RR* 13 12 56.3406450905 +18 07 13.765187447     16.971   16.392 ~ 12 0
68 Cl* NGC 5024 SAW V82 * 13 12 56.50 +18 13 10.0       18.864   ~ 4 0
69 Cl* NGC 5024 KRA 10 RR* 13 12 56.67 +18 09 20.8           ~ 7 0
70 2MASS J13125679+1811093 RR* 13 12 56.790 +18 11 09.36           ~ 7 0
71 2MASS J13125694+1808419 RG* 13 12 56.9439337022 +18 08 41.916997643   15.34 14.04   12.69 ~ 3 0
72 2MASS J13125695+1809357 RR* 13 12 56.954 +18 09 35.78           ~ 8 0
73 CRTS J131257.2+180740 RR* 13 12 57.1406606532 +18 07 40.483321989     16.17   16.192 ~ 9 0
74 Cl* NGC 5024 SAW V80 SX* 13 12 57.40 +18 10 15.2       17.915   ~ 5 0
75 [SS2011] VC24 RR* 13 12 57.58 +18 10 49.6       19.842   ~ 8 0
76 2MASS J13125960+1810046 RR* 13 12 59.601 +18 10 04.65           ~ 8 0
77 2MASS J13130013+1809256 RR* 13 13 00.136 +18 09 25.66           ~ 9 0
78 Cl* NGC 5024 SAW V30 RR* 13 13 00.173 +18 02 03.99     16.88     ~ 7 0
79 2MASS J13130043+1811049 RR* 13 13 00.4245324541 +18 11 05.021574685           ~ 8 0
80 [SHM2017] J198.25363+18.19165 RR* 13 13 00.8628768228 +18 11 29.932283659     16.69     ~ 11 0
81 Cl* NGC 5024 SAW V67 * 13 13 01.0228074833 +18 10 09.554634846     14.08     ~ 6 0
82 2MASS J13130157+1810039 RG* 13 13 01.5765779808 +18 10 03.912063884     13.83     ~ 4 0
83 Cl* NGC 5024 SXP 3 SX* 13 13 01.92 +18 10 13.2   19.51 19.25 19.356   ~ 5 0
84 Cl* NGC 5024 RLB 782 RR* 13 13 02.3385103920 +18 08 35.989108602     16.825   16.434 ~ 7 0
85 Cl* NGC 5024 SAW V35 RR* 13 13 02.355 +18 12 37.31     16.943   16.501 ~ 8 0
86 2MASS J13130246+1813234 RG* 13 13 02.4610669682 +18 13 23.359636324   15.86 14.83   13.68 ~ 7 0
87 USNO-B1.0 1081-00245846 * 13 13 02.49 +18 06 30.4   17.0   17.1   ~ 2 0
88 2MASS J13130271+1806294 SX* 13 13 02.6951165231 +18 06 29.631324964   16.6 17.454 16.3 16.639 ~ 4 0
89 Cl* NGC 5024 RLB 757 RR* 13 13 03.2871442022 +18 15 10.339329399     16.879   16.465 ~ 7 0
90 Cl* NGC 5024 SXP 1 SX* 13 13 03.38 +18 09 25.3   19.09 18.81 18.927   ~ 5 0
91 Cl* NGC 5024 RLB 23 * 13 13 03.6627928000 +18 09 38.855483541   15.39 14.07   12.69 ~ 3 0
92 Cl* NGC 5024 RLB 750 RR* 13 13 03.9041987121 +18 10 19.950732833     16.819   16.297 ~ 10 0
93 Cl* NGC 5024 RLB 756 RR* 13 13 04.2611474531 +18 08 46.956427880     16.782   16.194 ~ 8 0
94 CRTS J131304.4+181037 RR* 13 13 04.4103103554 +18 10 37.316139221     16.78   16.224 ~ 10 0
95 2MASS J13130467+1810594 RG* 13 13 04.6702096596 +18 10 59.433574455     13.91     ~ 5 0
96 Cl* NGC 5024 SXP 7 SX* 13 13 05.01 +18 08 36.1   19.74 19.52 19.434   ~ 5 0
97 2MASS J13130531+1814508 RG* 13 13 05.3062625243 +18 14 51.011151800   15.69 14.62   13.42 ~ 6 0
98 Cl* NGC 5024 RLB 560 RR* 13 13 07.0125489499 +18 09 26.308038372     16.880   16.443 ~ 9 0
99 Cl* NGC 5024 SXP 5 SX* 13 13 08.15 +18 07 38.4   19.69 19.44 19.435   ~ 5 0
100 Cl* NGC 5024 RLB 803 RR* 13 13 09.0688588386 +18 04 16.391569331   16.6 16.875   16.468 ~ 6 0
101 Cl* NGC 5024 SXP 6 SX* 13 13 09.44 +18 09 40.1   19.67 19.37 19.455   ~ 5 0
102 Cl* NGC 5024 RLB 593 RR* 13 13 12.3849972133 +18 13 55.381517049     16.78   16.552 ~ 9 0
103 2MASS J13131736+1814463 RG* 13 13 17.3591824893 +18 14 46.394971167   15.64 14.56   13.35 ~ 10 0
104 Cl* NGC 5024 SAW V88 SX* 13 13 19.09 +18 06 40.7   19.51 19.17     ~ 3 0
105 Cl* NGC 5024 RLB 967 RR* 13 13 20.5381719550 +18 06 43.085225973     16.880   16.428 ~ 9 0
106 Cl* NGC 5024 SAW V77 SX* 13 13 20.80 +18 15 34.9     18.45   18.045 ~ 4 0
107 Cl* NGC 5024 SAW V12 RR* 13 13 23.8268387735 +18 13 16.560400953     15.92     ~ 7 0
108 CRTS J131326.0+180943 RR* 13 13 26.0730027361 +18 09 43.545664658   17.1 16.78     ~ 7 0
109 Cl* NGC 5024 SAW V13 RR* 13 13 28.2333893384 +18 05 13.004526321     16.70     ~ 8 0
110 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 516 0
111 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2225 0
112 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 699 0
113 V* UU Boo RR* 15 17 05.2604081947 +35 06 56.520825778   12.47 12.28     kA9.5hF6 68 0
114 V* V445 Oph RR* 16 24 41.2159030246 -06 32 29.926362675   11.59 11.30     F2.5 109 0
115 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1870 0
116 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2851 0
117 V* AV Peg RR* 21 52 02.7946161616 +22 34 29.376544849 10.26 10.07 9.87     F0 151 0
118 V* SX Phe SX* 23 46 32.8929064612 -41 34 54.770795675   7.40 7.12     A3V 308 0

    Equat.    Gal    SGal    Ecl

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2019.11.20-14:41:35

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