2009ApJ...704L.103C

Query : 2009ApJ...704L.103C

2009ApJ...704L.103C - Astrophys. J., 704, L103-L107 (2009/October-3)

The variable star population of the globular cluster B514 in the Andromeda galaxy.

CLEMENTINI G., CONTRERAS R., FEDERICI L., CACCIARI C., MERIGHI R., SMITH H.A., CATELAN M., FUSI PECCI F., MARCONI M., KINEMUCHI K. and PRITZL B.J.

Abstract (from CDS):

A rich harvest of RR Lyrae stars has been identified for the first time in B514, a metal-poor ([Fe/H] ~- 1.95±0.10 dex) globular cluster (GC) of the Andromeda galaxy (M31), based on Hubble Space Telescope Wide Field Planetary Camera 2 and Advanced Camera for Surveys time-series observations. We have detected and derived periods for 89 RR Lyrae stars (82 fundamental-mode, RRab, and 7 first-overtone, RRc, pulsators, respectively) among 161 candidate variables identified in the cluster. The average period of the RR Lyrae variables ( = 0.58 days and = 0.35 days, for RRab and RRc pulsators, respectively) and the position in the period-amplitude diagram both suggest that B514 is likely an Oosterhoff type I cluster. This appears to be in disagreement with the general behavior of the metal-poor GCs in the Milky Way, which show instead Oosterhoff type II pulsation properties. The average apparent magnitude of the RR Lyrae stars sets the mean level of the cluster horizontal branch at = 25.18±0.02 (σ = 0.16 mag, on 81 stars). By adopting a reddening E(B - V) = 0.07±0.02 mag, the above metallicity and MV = 0.44±0.05 mag for the RR Lyrae variables of this metallicity, we derive a distance modulus of µ0= 24.52±0.08 mag, corresponding to a distance of about 800±30 kpc, based on a value of MV that sets µ0(LMC)=18.52 mag.

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Journal keyword(s): galaxies: individual: M31 - globular clusters: individual: B514 - stars: distances - stars: variables: other - techniques: photometric

Simbad objects: 13

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Number of rows : 13
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 Bol 514 GlC 00 31 09.83 +37 54 00.0     16.28   14.68 ~ 43 0
2 Bol 293 GlC 00 36 20.8643945520 +40 53 37.135021884 17.190 17.033 16.35 15.787 15.40 ~ 58 0
3 Bol 311 GlC 00 39 33.7263390600 +40 31 14.621665512 16.338 16.209 15.362 14.803 14.39 ~ 82 0
4 Bol 12 GlC 00 40 32.4604299648 +41 21 44.200683396 15.990 15.860 15.17 14.620 14.14 ~ 81 0
5 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
6 Bol 386 GlC 00 46 27.0143614272 +42 01 52.743069552 16.554 16.355 15.541 14.997 14.435 ~ 93 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
9 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
10 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
11 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
12 V* RR Lyr RR* 19 25 27.9129605304 +42 47 03.693258204   7.36   7.6   kA3hF0 951 0
13 NAME Local Group GrG ~ ~           ~ 9325 0

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