2019MNRAS.486.2791D

Query : 2019MNRAS.486.2791D

2019MNRAS.486.2791D - Mon. Not. R. Astron. Soc., 486, 2791-2808 (2019/June-3)

A new study of the variable star population in the Hercules globular cluster (M13: NGC 6205).

DERAS D., ARELLANO FERRO A., LAZARO C., BUSTOS FIERRO I.H., CALDERON J.H., MUNEER S. and GIRIDHAR S.

Abstract (from CDS):

We present the results from VI CCD time-series photometry of the globular cluster M13 (NGC 6205). From the Fourier decomposition of the light curves of RRab and RRc stars we found an average metallicity of [Fe/H]zw = -1.58 ± 0.09. The distance to the cluster was estimated as 7.1 ± 0.1 kpc from independent methods related to the variable star families RR Lyrae, SX Phe and W Virginis, from the luminosity of the theoretical ZAHB and from the orbit solution of a newly discovered contact binary star. The RR Lyrae pulsation modes are segregated by the red edge of the first overtone instability strip in this OoII-type cluster. A membership analysis of 52 800 stars in the field of the cluster is presented based on Gaia-DR2 proper motions which enabled the recognition of 23 070 likely cluster members, for 7630 of which we possess VI photometry. The identification of member stars allowed the construction of a clean CMD and a proper ZAHB and isochrone fitting, consistent with a reddening, age and distance of 0.02 mag, 12.6 Gyr and 7.1 kpc, respectively. We report seven new variables: one RRc, two SX Phe stars, three SR and one contact binary. V31 presents double-mode nature and we confirm V36 as RRd. 15 variable star candidates are also reported. The analysis of 18 stars in the field of the cluster, reported as RR Lyrae from the Gaia-DR2 data base, reveals that at least seven are not variable. We noted the presence of a high-velocity star in the field of the cluster.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: fundamental parameters - stars: variables: RR Lyrae - globular clusters: individual: M13

Nomenclature: Fig. 2, Table 2: Cl* NGC 6205 SAW VNN (Nos V54-V60) added. Fig. 2, Table 3: [DAL2019] M13 CNN (Nos C1-C15).

Simbad objects: 61

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Number of rows : 61
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 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
2 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
3 Cl* NGC 6205 SAW V57 EB* 16 41 21.3857640936 +36 28 18.189161328           ~ 3 0
4 NGC 6205 66 * 16 41 23.0399537280 +36 28 05.357933076   14.73 14.10     ~ 12 0
5 NGC 6205 70 RG* 16 41 23.5306872480 +36 30 17.265922560   13.71 12.12     ~ 93 0
6 NGC 6205 72 RG* 16 41 24.0799988472 +36 25 30.784251324   13.54 12.32     ~ 73 0
7 NGC 6205 96 RG* 16 41 27.0864680880 +36 28 00.359401188   13.79 12.52     ~ 71 0
8 NGC 6205 194 RG* 16 41 31.9970786088 +36 28 29.999965224   13.54 12.03     ~ 58 0
9 [DAL2019] M13 C1 V*? 16 41 32.330 +36 27 34.52     12.97   11.78 ~ 1 0
10 Cl* NGC 6205 SAW V50 dS* 16 41 32.42 +36 28 52.0     16.93   16.50 ~ 6 0
11 NGC 6205 206 RR* 16 41 32.6563847592 +36 28 02.165035404   15.549 15.100     ~ 28 0
12 [DAL2019] M13 C12 V*? 16 41 33.650 +36 26 07.54     13.08   13.23 ~ 1 0
13 NGC 6205 240 RG* 16 41 33.9173386656 +36 30 05.682748896   13.71 12.34     ~ 45 0
14 NGC 6205 252 RG* 16 41 34.3412115240 +36 30 13.276471320   13.098 11.771 12.393 11.36 ~ 34 0
15 [DAL2019] M13 C13 V*? 16 41 34.750 +36 29 13.74     14.01   13.81 ~ 1 0
16 NGC 6205 261 RG* 16 41 34.7595031656 +36 27 59.516329536   13.50 12.17   10.79 ~ 44 0
17 [DAL2019] M13 C4 V*? 16 41 34.800 +36 27 19.38     12.25   10.87 ~ 1 0
18 Cl* NGC 6205 BARN 55 RG* 16 41 35.5110144199 +36 27 27.411645285   12.1 11.94     ~ 8 0
19 [DAL2019] M13 C5 V*? 16 41 35.680 +36 26 48.61     12.55   11.31 ~ 1 0
20 Cl* NGC 6205 SAW V2 WV* 16 41 35.9002889688 +36 27 48.514286736   13.63 13.01     A8-F8 37 0
21 NGC 6205 324 RG* 16 41 36.6351298080 +36 26 35.468102904   13.65 12.00     ~ 47 0
22 NGC 6205 344 RR* 16 41 37.1258223552 +36 26 28.952161224   15.15 14.93     ~ 20 0
23 NGC 6205 414 RG* 16 41 38.6880896352 +36 25 37.905071700   13.61 12.14     ~ 65 0
24 Cl* NGC 6205 PK 2 SX* 16 41 38.77 +36 26 20.9     17.12   16.68 ~ 6 0
25 [DAL2019] M13 C14 V*? 16 41 39.030 +36 27 09.33     14.39   14.29 ~ 1 0
26 NGC 6205 445 * 16 41 39.2195 +36 27 23.510     12.20     ~ 8 0
27 [DAL2019] M13 C6 V*? 16 41 39.730 +36 26 37.79     12.87   11.69 ~ 1 0
28 [DAL2019] M13 C7 V*? 16 41 39.770 +36 28 06.43     14.20   14.09 ~ 1 0
29 [DAL2019] M13 C8 V*? 16 41 40.410 +36 28 09.81     14.07   13.90 ~ 1 0
30 Cl* NGC 6205 SAW V58 * 16 41 40.6973709168 +36 27 16.386393456           ~ 1 0
31 NGC 6205 554 * 16 41 41.1342 +36 27 22.987     12.70     ~ 9 0
32 Cl* NGC 6205 PK 1 SX* 16 41 41.35 +36 27 04.6     17.23   16.78 ~ 4 0
33 Cl* NGC 6205 SAW V35 RR* 16 41 41.43 +36 27 47.1           ~ 6 0
34 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
35 2MASS J16414189+3628184 RG* 16 41 41.8841862576 +36 28 18.322587048   14.16 13.10     ~ 11 0
36 NGC 6205 598 RG* 16 41 41.9443189176 +36 26 51.715259736   13.64 12.00     ~ 57 0
37 Cl* NGC 6205 SAW V37 SX* 16 41 42.45 +36 28 21.8     17.18   16.92 ~ 6 0
38 Cl* NGC 6205 CGY 6275 RR* 16 41 42.4953 +36 27 31.160     13.18     ~ 11 0
39 2MASS J16414255+3626563 RG* 16 41 42.5493186408 +36 26 56.173428780   13.42 11.94     ~ 38 0
40 [DAL2019] M13 C9 V*? 16 41 42.840 +36 31 00.93     15.40   15.36 ~ 1 0
41 Cl* NGC 6205 SAW V36 * 16 41 43.45 +36 26 26.0           ~ 5 0
42 [DAL2019] M13 C10 V*? 16 41 43.560 +36 27 11.02     14.41   14.36 ~ 1 0
43 2MASS J16414398+3622338 AB* 16 41 43.9791716280 +36 22 33.652315128   14 12.96     ~ 40 0
44 [DAL2019] M13 C11 V*? 16 41 44.380 +36 26 21.50     15.18   15.19 ~ 1 0
45 Cl* NGC 6205 SAW V60 * 16 41 44.5530393864 +36 27 52.814145600           ~ 1 0
46 [DAL2019] M13 C15 V*? 16 41 45.600 +36 26 37.42     15.10   15.01 ~ 1 0
47 Cl* NGC 6205 SAW V56 SX* 16 41 45.6375421080 +36 26 54.996978768           ~ 1 0
48 Cl* NGC 6205 SAW V41 LP* 16 41 45.7042606072 +36 27 57.607470645     13.14     ~ 11 0
49 NGC 6205 807 * 16 41 46.2697739040 +36 28 55.206903684   14.72 14.41     ~ 10 0
50 NGC 6205 806 RR* 16 41 46.2708705096 +36 27 37.997414280   14.91 14.82     ~ 13 1
51 Cl* NGC 6205 SAW V5 RR* 16 41 46.3749846000 +36 27 39.994290900   14.94 14.77     ~ 16 1
52 NGC 6205 816 WV* 16 41 46.4819241696 +36 27 27.821090052   14.53 14.09     A2 38 0
53 2MASS J16414703+3625576 RG* 16 41 47.0167556736 +36 25 57.511404084   13.48 12.03     ~ 40 0
54 Cl* NGC 6205 SAW V6 WV* 16 41 47.9755382448 +36 29 09.747499020   14.63 14.08     F2 33 0
55 Cl* NGC 6205 SAW V55 SX* 16 41 48.4828197216 +36 26 13.824877272           ~ 1 0
56 NGC 6205 918 RR* 16 41 49.13 +36 27 06.3     14.83     ~ 6 0
57 2MASS J16414970+3627489 RG* 16 41 49.6881218256 +36 27 48.777763752   13.47 12.04     ~ 28 0
58 NGC 6205 954 RG* 16 41 50.2992880776 +36 24 15.542524512   13.63 12.09     ~ 68 0
59 NGC 6205 973 RG* 16 41 50.9158586208 +36 28 54.352362612   13.65 11.91     ~ 73 0
60 NGC 6205 1109 RR* 16 42 07.6615485432 +36 29 36.734743068   15.11 14.95     B/A 11 0
61 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 348 0

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