2005AJ....129.2670R


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST06:43:26

2005AJ....129.2670R - Astron. J., 129, 2670-2691 (2005/June-0)

Hubble space telescope WFPC2 color-magnitude diagrams for globular clusters in M31.

RICH R.M., CORSI C.E., CACCIARI C., FEDERICI L., FUSI PECCI F., DJORGOVSKI S.G. and FREEDMAN W.L.

Abstract (from CDS):

We report new photometry for 10 globular clusters in M31, observed to a uniform depth of four orbits in F555W (V) and F814W (I) using WFPC2 on board the Hubble Space Telescope (HST). In addition, we have reanalyzed HST archival data of comparable quality for two more clusters. A special feature of our analysis is the extraordinary care taken to account for the effects of blended stellar images and the required subtraction of contamination from the field stellar populations in M31 in which the clusters are embedded. We thus reach 1 mag fainter than the horizontal branch (HB), even in unfavorable cases. We also show that an apparent peculiar steep slope of the HB for those clusters with blue HB stars is actually due to blends between blue HB stars and red giants. We present the color-magnitude diagrams (CMDs) and discuss their main features in comparison with the properties of the Galactic globular clusters. This analysis is augmented with CMDs previously obtained and discussed on eight other M31 clusters. We report the following significant results: (1) The loci of the red giant branches give reliable photometric metallicity determinations that generally compare very well with ground-based integrated spectroscopic and photometric measures, as well as giving good reddening estimates. (2) The HB morphologies follow the same behavior with metallicity as the Galactic globular clusters, with indications that the second-parameter effect can be present in some clusters of our sample. However, at [Fe/H]≃-1.7 we observe a number of clusters with red HB morphology such that the HB type versus [Fe/H] relationship is offset from that of the Milky Way (MW) and resembles that of the Fornax dwarf spheroidal galaxy. One explanation for the offset is that the most metal-poor M31 globular clusters are younger than their MW counterparts by 1-2 Gyr; further study is required. (3) The MV(HB) versus [Fe/H] relationship has been redetermined, and the slope (∼0.20) is very similar to the values derived from RR Lyrae stars in the MW and the LMC. The zero point of this relation (MV=0.51 at [Fe/H]=-1.5) is based on the assumed distance modulus (m-M)0(M31)=24.47±0.03, and is consistent with the distance scale that places the LMC at (m-M)0(LMC)=18.55.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: Messier Number: M31 - Galaxies: Star Clusters - Galaxies: Stellar Content - Galaxy: Globular Clusters: General

Simbad objects: 40

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Number of rows : 40

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3628 0
2 NAME Mayall II GlC 00 32 46.53 +39 34 40.5   14.564 13.807 13.208 12.684 ~ 374 1
3 RX J0036.3+4053 GlC 00 36 20.86 +40 53 37.1 17.190 17.033 16.35 15.787 15.40 ~ 55 0
4 BA 3-17 GlC 00 39 33.72 +40 31 14.7 16.338 16.209 15.362 14.803 14.39 ~ 78 0
5 Bol 6 GlC 00 40 26.4828316304 +41 27 26.653846594 16.940 16.490 15.74 14.970 14.52 ~ 82 0
6 Bol 12 GlC 00 40 32.4598109034 +41 21 44.200706344 15.990 15.860 15.17 14.620 14.14 ~ 75 0
7 Bol 338 GlC 00 40 58.871 +40 35 47.41 15.123 15.034 14.168 13.621 13.27 ~ 73 0
8 Bol 27 GlC 00 41 14.524 +40 55 51.19 16.669 16.486 15.642 15.104 14.55 ~ 63 0
9 KWC 42 GlC 00 41 18.7265887650 +40 57 15.632022093 19.743 18.754 17.436 16.574 15.729 ~ 41 0
10 Bol 343 GlC 00 41 43.1011408698 +40 12 22.414305198 17.230 17.080 16.69 15.910 15.42 ~ 69 0
11 Bol 45 GlC 00 41 43.11 +41 34 20.1 17.059 16.665 15.727 15.140 14.63 ~ 98 0
12 2MASS J00415300+4047096 GlC 00 41 53.008 +40 47 09.65 15.986 15.776 14.967 14.474 14.03 ~ 75 0
13 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2038 2
14 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11267 1
15 Bol 468 GlC 00 43 12.55 +39 47 57.3 18.490 18.490 17.788 17.200 16.626 ~ 35 0
16 NAME Mayall IV GlC 00 43 17.85 +39 49 13.2 15.900 15.710 15.219 14.639 14.122 ~ 82 0
17 2E 166 GlC 00 44 29.560 +41 21 35.72 15.50 15.000 14.220 13.679 13.02 ~ 127 0
18 Bol 233 GlC 00 44 42.12 +41 43 54.5 16.552 16.404 15.615 15.144 14.593 ~ 48 0
19 Bol 240 GlC 00 45 25.0383976564 +41 06 22.131507926 16.030 15.930 15.210 14.730 14.210 ~ 76 0
20 Bol 379 GlC 00 45 58.8309005030 +40 42 31.400600234 17.460 17.032 16.183 15.560 14.936 ~ 74 0
21 Bol 384 GlC 00 46 21.9300523115 +40 16 59.647551658 17.370 16.743 15.752 15.260 14.564 ~ 62 0
22 BA 3-8 GlC 00 46 27.016 +42 01 52.75 16.554 16.355 15.541 14.997 14.435 ~ 86 0
23 Bol 405 GlC 00 49 39.80 +41 35 29.8 16.220 15.930 15.195 14.656   ~ 61 0
24 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 947 0
25 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 970 0
26 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15288 1
27 NGC 2808 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1285 0
28 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2305 0
29 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 353 0
30 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1811 0
31 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2041 0
32 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1935 0
33 NGC 6356 GlC 17 23 34.99 -17 48 46.9   10.01 7.42     ~ 324 1
34 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1829 1
35 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 546 0
36 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 796 1
37 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1829 2
38 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1844 0
39 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2951 0
40 NAME Local Group GrG ~ ~           ~ 7231 0

    Equat.    Gal    SGal    Ecl

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2021.04.15-06:43:26

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