2021A&A...651A..47A


Query : 2021A&A...651A..47A

2021A&A...651A..47A - Astronomy and Astrophysics, volume 651A, 47-47 (2021/7-1)

Variable stars in the VVV globular clusters. II. NGC 6441, NGC 6569, NGC 6626 (M 28), NGC 6656 (M 22), 2MASS-GC 02, and Terzan 10.

ALONSO-GARCIA J., SMITH L.C., CATELAN M., MINNITI D., NAVARRETE C., BORISSOVA J., CARBALLO-BELLO J.A., CONTRERAS RAMOS R., FERNANDEZ-TRINCADO J.G., FERREIRA LOPES C.E., GRAN F., GARRO E.R., GEISLER D., GUO Z., HEMPEL M., KERINS E., LUCAS P.W., PALMA T., PENA RAMIREZ K., RAMIREZ ALEGRIA S. and SAITO R.K.

Abstract (from CDS):


Context. The Galactic globular clusters (GGCs) located in the inner regions of the Milky Way suffer from high extinction that makes their observation challenging. High densities of field stars in their surroundings complicate their study even more. The VISTA Variables in the Via Lactea (VVV) survey provides a way to explore these GGCs in the near-infrared where extinction effects are highly diminished.
Aims. We conduct a search for variable stars in several inner GGCs, taking advantage of the unique multi-epoch, wide-field, near-infrared photometry provided by the VVV survey. We are especially interested in detecting classical pulsators that will help us constrain the physical parameters of these GGCs. In this paper, the second of a series, we focus on NGC 6656 (M 22), NGC 6626 (M 28), NGC 6569, and NGC 6441; these four massive GGCs have known variable sources, but quite different metallicities. We also revisit 2MASS-GC 02 and Terzan 10, the two GGCs studied in the first paper of this series.
Methods. We present an improved method and a new parameter that efficiently identify variable candidates in the GGCs. We also use the proper motions of those detected variable candidates and their positions in the sky and in the color-magnitude diagrams to assign membership to the GGCs.
Results. We identify and parametrize in the near-infrared numerous variable sources in the studied GGCs, cataloging tens of previously undetected variable stars. We recover many known classical pulsators in these clusters, including the vast majority of their fundamental mode RR Lyrae. We use these pulsators to obtain distances and extinctions toward these objects. Recalibrated period-luminosity-metallicity relations for the RR Lyrae bring the distances to these GGCs to a closer agreement with those reported by Gaia, except for NGC 6441, which is an uncommon Oosterhoff III GGC. Recovered proper motions for these GGCs also agree with those reported by Gaia, except for 2MASS-GC 02, the most reddened GGC in our sample, where the VVV near-infrared measurements provide a more accurate determination of its proper motions.

Abstract Copyright: © ESO 2021

Journal keyword(s): globular clusters: general - stars: variables: general - stars: variables: RR Lyrae

VizieR on-line data: <Available at CDS (J/A+A/651/A47): table2.dat table5.dat-table9.dat figure4.dat figure7.dat-figure9.dat figure12.dat figure13.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3231 0
2 [FSR2007] 1758 GlC 17 31 12.0 -39 48 30           ~ 44 0
3 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 860 1
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12914 0
5 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 828 0
6 ESO 521-16 GlC 18 02 57.40 -26 04 00.0           ~ 88 0
7 NAME 2MASS-GC02 GlC 18 09 36.5 -20 46 44           ~ 45 0
8 NGC 6569 GlC 18 13 38.88 -31 49 35.2   10.78 9.47     ~ 214 0
9 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 715 0
10 OGLE BLG566.10 66564 RR* 18 36 19.5575569584 -23 54 32.900552532 15.15 15.00 14.27   13.26 ~ 8 0
11 OGLE BLG566.10 35099 WV* 18 36 21.7896926520 -23 54 13.376004264     13.384   12.329 ~ 5 0
12 OGLE BLG-RRLYR-36672 RR* 18 36 23.0261549472 -23 54 41.560825500 15.36 14.93 14.28   13.32 ~ 8 0
13 Cl* NGC 6656 KT V55 RR* 18 36 23.25 -23 53 57.3 15.07 14.85 14.14   13.17 ~ 3 0
14 OGLE BLG-RRLYR-36673 RR* 18 36 23.3618668368 -23 55 29.303787828 15.09 14.94 14.17   13.15 ~ 6 0
15 OGLE BLG566.10 29209 RR* 18 36 23.7579773280 -23 55 39.008659116 15.00 14.78 14.19   13.38 ~ 5 0
16 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1295 0
17 OGLE BLG-RRLYR-36675 RR* 18 36 25.7480973144 -23 52 58.109849616 14.73 14.64 14.055   13.324 ~ 7 0
18 Cl* NGC 6656 KT V14 RR* 18 36 30.67 -23 53 53.1 14.85 14.69 14.07   13.25 ~ 3 0
19 OGLE BLG566.10 7453 RR* 18 36 30.9497264448 -23 53 48.979444668   17.28 16.56   15.59 ~ 5 0
20 OGLE BLG-RRLYR-36695 RR* 18 37 48.2654403600 -23 56 22.722482652     18.788   18.145 ~ 4 0
21 NAME Galactic Bulge reg ~ ~           ~ 3848 0

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2022.05.28-23:10:23

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