2008A&A...483..769F

Query : 2008A&A...483..769F

2008A&A...483..769F - Astronomy and Astrophysics, volume 483769-781 (2008/6-1)

Evidence for metallicity spreads in three massive M31 globular clusters.

FUENTES-CARRERA I., JABLONKA P., SARAJEDINI A., BRIDGES T., DJORGOVSKI G. and MEYLAN G.

Abstract (from CDS):

We quantify the intrinsic width of the red giant branches of three massive globular clusters in M31 in a search for metallicity spreads within these objects. We present HST/ACS observations of three massive clusters in M31, G78, G213, and G280. A thorough description of the photometry extraction and calibration is presented. After derivation of the color-magnitude diagrams, we quantify the intrinsic width of the red giant branch of each cluster. This width translates into a metallicity dispersion that indicates a complex star formation history for this type of system. For G78, σ[Fe/H]=0.86±0.37 ; for G213, 0.89±0.20 ; and for G280, 1.03±0.26. We find that the metallicity dispersion of the clusters does not scale with mean metallicity. We also find no trend with the cluster mass. We discuss some possible formation scenarios that would explain our results.

Abstract Copyright: ∼

Journal keyword(s): galaxies: evolution - galaxies: Local Group - galaxies: star clusters - Galaxy: globular clusters: general

VizieR on-line data: <Available at CDS (J/A+A/483/769): table2a.dat table2b.dat table2c.dat>

Nomenclature: Table 2a: [FJS2008] G78 NNNNNN N=8805. Table 2b: [FJS2008] G213 NNNNNN N=15233. Table 2c: [FJS2008] G280 NNNNNN N=12982.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

CDS comments: Paragraph 2.1 : objects D68 and D642 = [H80] 68 and [H80] 642 in Simbad.

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 NAME Mayall II GlC 00 32 46.5323801712 +39 34 40.504803060   14.564 13.807 13.208 12.684 ~ 400 1
2 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
3 Bol 23 GlC 00 41 01.151 +41 13 45.41 16.040 15.400 14.17 13.560 12.570 ~ 98 0
4 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
5 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
6 Bol 158 GlC 00 43 14.3953843272 +41 07 21.141017796 15.900 15.560 14.65 14.150 13.550 ~ 119 1
7 Bol 225 GlC 00 44 29.5618369896 +41 21 35.714596284 15.50 15.000 14.220 13.679 13.02 ~ 136 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
9 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
10 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
11 [H80] 642 DNe ~ ~           ~ 1 0
12 [H80] 68 DNe ~ ~           ~ 1 0
13 NAME Local Group GrG ~ ~           ~ 9325 0

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