2022A&A...657A.123O


Query : 2022A&A...657A.123O

2022A&A...657A.123O - Astronomy and Astrophysics, volume 657A, 123-123 (2022/1-1)

Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters.

OLIVEIRA R.A.P., ORTOLANI S., BARBUY B., KERBER L.O., MAIA F.F.S., BICA E., CASSISI S., SOUZA S.O. and PEREZ-VILLEGAS A.

Abstract (from CDS):


Context. RR Lyrae stars are useful standard candles allowing one to derive accurate distances for old star clusters. Based on the recent catalogues from OGLE-IV and Gaia Early Data Release 3 (EDR3), the distances can be improved for a few bulge globular clusters.
Aims. The aim of this work is to derive an accurate distance for the following six moderately metal-poor, relatively high-reddening bulge globular clusters: NGC 6266, NGC 6441, NGC 6626, NGC 6638, NGC 6642, and NGC 6717.
Methods. We combined newly available OGLE-IV catalogues of variable stars containing mean I magnitudes, with Clement's previous catalogues containing mean V magnitudes, and with precise proper motions from Gaia EDR3. Astrometric membership probabilities were computed for each RR Lyrae, in order to select those compatible with the cluster proper motions. Applying luminosity-metallicity relations derived from BaSTI α-enhanced models (He-enhanced for NGC 6441 and canonical He for the other clusters), we updated the distances with relatively low uncertainties.
Results. Distances were derived with the I and V bands, with a 5 - 8% precision. We obtained 6.6 kpc, 13.1 kpc, 5.6 kpc, 9.6 kpc, 8.2 kpc, and 7.3 kpc for NGC 6266, NGC 6441, NGC 6626, NGC 6638, NGC 6642, and NGC 6717, respectively. The results are in excellent agreement with the literature for all sample clusters, considering the uncertainties.
Conclusions. The present method of distance derivation, based on recent data of member RR Lyrae stars, updated BaSTI models, and robust statistical methods, proved to be consistent. A larger sample of clusters will be investigated in a future work.

Abstract Copyright: © ESO 2022

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

VizieR on-line data: <Available at CDS (J/A+A/657/A123): ngc6266.dat ngc6441.dat ngc6626.dat ngc6638.dat ngc6642.dat ngc6717.dat>

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

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 10 EmG 00 08 34.5389200536 -33 51 30.197456964   13.13   11.79   ~ 45 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16509 1
3 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2406 0
4 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 579 0
5 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 875 1
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13433 0
7 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 788 1
8 NGC 6440 GlC 17 48 52.67 -20 21 34.5   12.01 10.10     ~ 519 1
9 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 846 0
10 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 504 0
11 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 733 0
12 NGC 6638 GlC 18 30 56.25 -25 29 47.1   10.81 9.68     ~ 218 0
13 NGC 6642 GlC 18 31 54.23 -23 28 34.1   11.30 10.24     ~ 186 0
14 NGC 6717 GlC 18 55 06.04 -22 42 05.3           ~ 226 0
15 NAME Galactic Bulge reg ~ ~           ~ 4012 0

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2023.01.30-22:01:21

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