2013AJ....146..119K

Query : 2013AJ....146..119K

2013AJ....146..119K - Astron. J., 146, 119 (2013/November-0)

The RR Lyrae variables and horizontal branch of NGC 6656 (M22).

KUNDER A., STETSON P.B., CASSISI S., LAYDEN A., BONO G., CATELAN M., WALKER A.R., PAREDES ALVAREZ L., CLEM J.L., MATSUNAGA N., SALARIS M., LEE J.-W. and CHABOYER B.

Abstract (from CDS):

The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC 6656 (M22), with observations spanning a range of 22 years. We have also redetermined the variability types and periods for the RR Lyrae stars identified previously by photographic observations, revising the number of fundamental-mode RR Lyrae variables (RR0) to 10 and the number of first-overtone variables (RR1) to 16. The mean periods of the RR0 and RR1 variables are

RR0= 0.66±0.02 days and

_ RR1_= 0.33±0.01 days, respectively, supporting an Oosterhoff II classification for the cluster. The number ratio of RR1-type to all RR-type variables is N1/NRR= 0.61, also consistent with an Oosterhoff II designation. Both the RR Lyrae stars' minimum light colors and the blue edge of the RR Lyrae instability strip suggest E( B - - V) = 0.36±0.02 mag toward M22. Regarding the HB morphology of M22, we find (B-R)/(B+V+R) = +0.97±0.1 and at least one "gap" located in an unusual part of the blue HB, in the middle of the so-called hot HB stars.


Abstract Copyright: ∼

Journal keyword(s): Galaxy: stellar content - stars: distances - stars: evolution - stars: horizontal-branch - stars: Population II

Nomenclature: Table 2: [KSC2013b] NVN (Nos NV1-NV4).

CDS comments: In introduction, NGC 6556 is a misprint for NGC 6656. In references, Clement et al. 2001, AJ, 121, 2587 is a misprint for 2001, AJ, 122, 2587.

Simbad objects: 66

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Number of rows : 66
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 1466 GlC 03 44 32.71 -71 40 18.0   11.6 11.59     ~ 166 0
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
6 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
7 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
8 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
9 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 616 0
10 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
11 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
12 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
13 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
14 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 485 0
15 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
16 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
17 NGC 6101 GlC 16 25 48.12 -72 12 07.9           ~ 337 0
18 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
19 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 406 1
20 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
21 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 348 0
22 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 244 0
23 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
24 V* V3853 Sgr RR* 18 35 03.4573541304 -23 51 15.501469392     13.17   13.542 ~ 18 1
25 V* V2592 Sgr RR* 18 35 27.6859848312 -23 45 33.788720052           ~ 5 0
26 OGLE BLG566.11 74160 RR* 18 35 28.3278690504 -23 45 29.862871812     13.33   13.301 ~ 13 1
27 V* V4067 Sgr Mi* 18 35 37.8528808752 -24 00 02.555456112           ~ 10 0
28 V* V4068 Sgr Mi* 18 35 51.3617985096 -23 52 24.290647464   15.50       ~ 8 0
29 Cl* NGC 6656 SAW V7 RR* 18 35 57.6037697352 -23 47 40.847133264 14.94 14.81 14.10   13.20 kA4.5hF0.5 11 0
30 ATO J278.9963-23.9537 RR* 18 35 59.1147957925 -23 57 13.389821461 14.92 14.66 14.14   13.41 ~ 5 0
31 OGLE BLG566.10 100119 RR* 18 36 02.9630347296 -23 50 29.614321248   14.586 14.055   13.244 ~ 8 0
32 OGLE BLG566.10 66589 RR* 18 36 13.1851087056 -23 53 47.001128244 14.94 14.72 14.16   13.42 ~ 6 0
33 V* V4069 Sgr Mi* 18 36 14.0892240984 -24 07 51.121031052           ~ 10 0
34 OGLE BLG566.10 61233 RR* 18 36 14.8000061832 -23 56 33.072451836 14.98 14.84 14.10   13.09 ~ 15 0
35 OGLE BLG-RRLYR-36667 RR* 18 36 15.8858128392 -23 56 07.085387400 14.99 14.75 14.156   13.383 ~ 13 0
36 OGLE BLG-RRLYR-36668 RR* 18 36 16.1452164240 -23 47 15.157938084   14.65 14.11 13.986 13.35 kA4hF1.5 13 0
37 OGLE BLG566.10 61242 RR* 18 36 18.2480666972 -23 56 03.622869248 14.91 14.80 14.10   13.14 ~ 14 0
38 OGLE BLG566.10 66564 RR* 18 36 19.5575569584 -23 54 32.900552532 15.15 15.00 14.27   13.26 ~ 13 0
39 OGLE BLG566.10 40816 RR* 18 36 20.5875595752 -23 52 17.396059584 15.06 14.75 14.19   13.33 kA6.5hF2 13 0
40 Cl* NGC 6656 SAW V10 RR* 18 36 20.9281969139 -23 56 27.358684259 14.93 14.82 14.13   13.16 ~ 9 0
41 OGLE BLG566.10 35079 RR* 18 36 23.0261549472 -23 54 41.560825500 15.36 14.93 14.28   13.32 ~ 12 0
42 Cl* NGC 6656 KT V26 RR* 18 36 23.16 -23 53 24.0 15.00 14.74 14.12   13.29 ~ 3 0
43 Cl* NGC 6656 KT V55 RR* 18 36 23.2420776241 -23 53 58.062693094 15.07 14.85 14.14   13.17 ~ 4 0
44 OGLE BLG566.10 29216 RR* 18 36 23.3618668368 -23 55 29.303787828 15.09 14.94 14.17   13.15 ~ 11 0
45 OGLE BLG566.10 29209 RR* 18 36 23.7579773280 -23 55 39.008659116 15.00 14.78 14.19   13.38 ~ 11 0
46 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
47 Cl* NGC 6656 SAW V24 * 18 36 24.04 -23 54 29.4 14.1 13.1 11.3   9.3 ~ 7 1
48 Cl* NGC 6656 SAW V35 LP* 18 36 24.0535695144 -23 54 29.612943936       10.841 9.43 ~ 3 0
49 OGLE BLG-RRLYR-36675 RR* 18 36 25.7480973144 -23 52 58.109849616 14.73 14.64 14.055   13.324 ~ 11 0
50 Cl* NGC 6656 SAW V34 * 18 36 26.10 -23 55 31.6           ~ 2 0
51 OGLE BLG566.10 40854 RR* 18 36 28.6485303360 -23 51 39.718415844 14.87 14.74 14.06   13.14 kA9.5hF5.5 14 0
52 VVV J183629.53-240132.95 RR* 18 36 29.5336844479 -24 01 32.949473107   14.58 14.05   13.38 ~ 5 0
53 OGLE BLG566.10 29170 RR* 18 36 30.35 -23 57 13.2 14.95 14.71 14.17   13.45 ~ 14 0
54 OGLE BLG-RRLYR-36678 RR* 18 36 30.5867556744 -23 41 03.476323896   14.817 14.264 14.253 13.37 ~ 14 0
55 Cl* NGC 6656 KT V14 RR* 18 36 30.6771995417 -23 53 53.986430918 14.85 14.69 14.07   13.25 ~ 6 0
56 OGLE BLG566.10 7453 RR* 18 36 30.9497264448 -23 53 48.979444668   17.28 16.56   15.59 ~ 8 0
57 OGLE BLG566.10 16147 RR* 18 36 31.6768029216 -23 49 30.586591380 15.08 14.72 14.18   13.42 ~ 12 0
58 OGLE BLG566.10 2721 RR* 18 36 32.0825056560 -23 55 40.896231456 14.98 14.84 14.21   13.34 ~ 12 0
59 OGLE BLG566.10 7329 RR* 18 36 34.9129698144 -23 53 06.567242352 14.81 14.79 14.10   13.19 ~ 11 0
60 OGLE BLG566.10 7295 RR* 18 36 36.9764719104 -23 54 33.535756512 15.06 14.80 14.24   13.44 kA1.5hA8.5 18 0
61 Cl* NGC 6656 SAW V3 RR* 18 36 38.0011471608 -23 47 15.268329960   16.49 15.64   14.69 ~ 8 0
62 OGLE BLG566.9 65482 RR* 18 36 46.2918549144 -23 48 02.538884772 15.02 14.83 14.18   13.30 kA3.5:hF2.5: 17 0
63 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
64 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
65 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
66 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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