2012A&A...546A..31P


Query : 2012A&A...546A..31P

2012A&A...546A..31P - Astronomy and Astrophysics, volume 546A, 31-31 (2012/10-1)

The horizontal branch morphology of M 31 globular clusters. Extreme second parameter effect in outer halo clusters.

PERINA S., BELLAZZINI M., BUZZONI A., CACCIARI C., FEDERICI L., FUSI PECCI F. and GALLETI S.

Abstract (from CDS):

We use deep, high quality color magnitude diagrams obtained with the Hubble Space Telescope to compute a simplified version of the Mironov index (SMI; (B)/(B+R)) to parametrize the horizontal branch (HB) morphology for 23 globular clusters in the M 31 galaxy (Sample A), all located in the outer halo at projected distances between 10kpc and 100kpc. This allows us to compare them with their Galactic counterparts, for which we estimated the SMI exactly in the same way, in the SMI vs. [Fe/H] plane. We find that the majority of the considered M 31 clusters lie in a significantly different locus, in this plane, with respect to Galactic clusters lying at any distance from the center of the Milky Way. In particular they have redder HB morphologies at a given metallicity, or, in other words, clusters with the same SMI value are ≃0.4dex more metal rich in the Milky Way than in M 31. We discuss the possible origin of this difference and we conclude that the most likely explanation is that many globular clusters in the outer halo of M 31 formed ≃1-2Gyr later than their counterparts in the outer halo of the Milky Way, while differences in the cluster-to-cluster distribution of He abundance of individual stars may also play a role. The analysis of another sample of 25 bright M 31 clusters (eighteen of them with MV≤-9.0, Sample B), whose SMI estimates are much more uncertain as they are computed on shallow color magnitude diagrams, suggests that extended blue HB tails can be relatively frequent among the most massive M 31 globular clusters, possibly hinting at the presence of multiple populations.

Abstract Copyright:

Journal keyword(s): stars: horizontal-branch - galaxies: star clusters: general - globular clusters: general - ultraviolet: stars - galaxies: stellar content

CDS comments: Table 1 Clusters MCE are M31WFS in Simbad, MCGCN are [MHF2007] GC N.

Simbad objects: 67

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Number of rows : 67
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 NAME Mackey-GC1 GlC 00 26 47.7578536272 +39 44 46.082343084     16.05   15.07 ~ 21 1
2 [HTF2008] H4 GlC 00 29 44.9901743184 +41 13 09.392400264     16.98   16.04 ~ 18 0
3 2MASX J00302731+4136193 GlC 00 30 27.3168237696 +41 36 18.963573372     16.31   15.36 ~ 22 0
4 [HTF2008] H6 GlC 00 31 09.83 +37 54 00.0     16.28   14.68 ~ 41 0
5 NAME Mayall II GlC 00 32 46.5323801712 +39 34 40.504803060   14.564 13.807 13.208 12.684 ~ 386 1
6 LEDA 2068390 GlC 00 35 59.7358005048 +35 41 03.597283752     16.09   15.01 ~ 29 0
7 Bol 531 ? 00 36 14.70 +40 57 56.6           ~ 5 0
8 Bol 292 GlC 00 36 16.6741929984 +40 58 26.496865560 17.870 17.891 16.995 16.624 16.060 ~ 38 0
9 RX J0036.3+4053 GlC 00 36 20.8643945520 +40 53 37.135021884 17.190 17.033 16.35 15.787 15.40 ~ 55 0
10 Bol 298 GlC 00 38 00.2526652248 +40 43 56.002153404 17.380 17.231 16.590 16.032 15.470 ~ 41 0
11 NAME M31-EC3 GlC 00 38 04.61 +40 44 39.4     17.60   16.58 ~ 16 0
12 NAME M31-EC1 GlC 00 38 19.49 +41 47 14.9     17.60   16.72 ~ 16 0
13 [HTF2008] H14 GlC 00 38 49.4541746088 +42 22 47.041791672     18.27   17.07 ~ 18 0
14 BA 3-17 GlC 00 39 33.7263390600 +40 31 14.621665512 16.338 16.209 15.362 14.803 14.39 ~ 78 0
15 Bol 6 GlC 00 40 26.4833924208 +41 27 26.647575012 16.940 16.490 15.74 14.970 14.52 ~ 84 0
16 Bol 8 GlC 00 40 30.2781445416 +41 16 08.785896780 18.160 17.660 16.560 16.210 15.510 ~ 41 0
17 Bol 10 GlC 00 40 31.5638438760 +41 14 22.626362436 17.650 17.500 16.660 16.120 15.480 ~ 45 0
18 Bol 12 GlC 00 40 32.4604299648 +41 21 44.200683396 15.990 15.860 15.17 14.620 14.14 ~ 78 0
19 Bol 336 GlC 00 40 47.5924807920 +42 08 41.907140664 18.790 18.521 17.811 17.403 16.950 ~ 28 0
20 Bol 337 GlC 00 40 48.4775559480 +42 12 10.961327664 17.690 17.522 16.733 16.242 15.630 ~ 39 0
21 Bol 338 GlC 00 40 58.871 +40 35 47.41 15.123 15.034 14.168 13.621 13.27 ~ 74 0
22 [MLV92] 237751 GlC 00 41 01.151 +41 13 45.41 16.040 15.400 14.17 13.560 12.570 ~ 85 0
23 Bol 27 GlC 00 41 14.5288661472 +40 55 50.974329576 16.669 16.486 15.642 15.104 14.55 ~ 63 0
24 Bol 45 GlC 00 41 43.1080448904 +41 34 20.102303784 17.059 16.665 15.727 15.140 14.63 ~ 103 0
25 Bol 343 GlC 00 41 43.1127886392 +40 12 22.378121748 17.230 17.080 16.69 15.910 15.42 ~ 69 0
26 2MASS J00415300+4047096 GlC 00 41 53.0027897448 +40 47 09.670417656 15.986 15.776 14.967 14.474 14.03 ~ 76 0
27 Bol 88 GlC 00 42 21.0614832024 +41 32 14.153991756 16.763 16.414 15.340 14.609 13.950 ~ 53 0
28 Bol 350 GlC 00 42 28.4502042864 +40 24 50.879742228 17.470 17.360 16.740 16.200 15.640 ~ 40 2
29 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12036 1
30 NAME M31-EC2 GlC 00 42 55.00 +43 57 28.0     17.10   16.17 ~ 19 0
31 Bol 468 GlC 00 43 12.55 +39 47 57.3 18.490 18.490 17.788 17.200 16.626 ~ 35 0
32 Bol 158 GlC 00 43 14.3953843272 +41 07 21.141017796 15.900 15.560 14.65 14.150 13.550 ~ 115 1
33 NAME Mayall IV GlC 00 43 17.8552869120 +39 49 13.076914764 15.900 15.710 15.219 14.639 14.122 ~ 83 0
34 [JSD2015] AP 253 GlC 00 44 19.4549832912 +41 30 34.664513446 17.315 17.178 16.472 15.963 15.458 ~ 46 0
35 BA 3-1 GlC 00 44 27.09 +41 28 49.8 16.132 16.034 15.340 14.842 14.339 ~ 53 0
36 2E 166 GlC 00 44 29.5618369896 +41 21 35.714596284 15.50 15.000 14.220 13.679 13.02 ~ 129 0
37 Bol 233 GlC 00 44 42.1083515616 +41 43 54.505563960 16.552 16.404 15.615 15.144 14.593 ~ 48 0
38 BA 3-24 GlC 00 44 46.6310290224 +42 03 50.257820304 16.946 16.888 16.176 15.718 15.072 ~ 41 0
39 Bol D255 GlC 00 44 48.56 +42 06 13.3 19.329 18.976 18.117 17.591 16.845 ~ 15 0
40 Bol 240 GlC 00 45 25.0383161496 +41 06 22.112717688 16.030 15.930 15.210 14.730 14.210 ~ 76 0
41 Bol 379 GlC 00 45 58.8308321424 +40 42 31.402542528 17.460 17.032 16.183 15.560 14.936 ~ 74 0
42 Bol 384 GlC 00 46 21.9315533736 +40 16 59.645958420 17.370 16.743 15.752 15.260 14.564 ~ 62 0
43 BA 3-8 GlC 00 46 27.0143614272 +42 01 52.743069552 16.554 16.355 15.541 14.997 14.435 ~ 88 0
44 Bol 405 GlC 00 49 39.7996917432 +41 35 29.776121412 16.220 15.930 15.195 14.656   ~ 62 0
45 NAME Mayall V GlC 00 50 09.9648082056 +41 41 01.034928888 17.630 16.953 16.053 15.400 14.830 ~ 56 0
46 [HTF2008] H23 GlC 00 54 24.9623336064 +39 42 55.529539920     16.72   15.68 ~ 22 0
47 [HTF2008] H24 GlC 00 55 43.94 +42 46 16.1     17.78   16.71 ~ 21 0
48 NAME M31-EC4 GlC 00 58 15.42 +38 03 02.0     18.84   17.77 ~ 26 0
49 [HTF2008] H27 GlC 01 07 26.30 +35 46 46.5     16.50   15.59 ~ 26 0
50 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1352 0
51 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 891 0
52 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1357 0
53 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 6788 3
54 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 948 0
55 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3286 0
56 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 796 0
57 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 347 0
58 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2018 0
59 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 873 1
60 NGC 6405 OpC 17 40 17 -32 14.5           ~ 187 0
61 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13335 0
62 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 843 0
63 NGC 6475 OpC 17 53 47 -34 50.5           ~ 359 0
64 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 270 0
65 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1015 0
66 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3054 0
67 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 992 0

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2022.12.08-17:52:20

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