2001ApJ...559..851W

Query : 2001ApJ...559..851W

2001ApJ...559..851W - Astrophys. J., 559, 851-863 (2001/October-1)

Identification and analysis of young star cluster candidates in M31.

WILLIAMS B.F. and HODGE P.W.

Abstract (from CDS):

We present a method for finding clusters of young stars in M31 using broadband WFPC2 data from the HST data archive. Applying our identification method to 13 WFPC2 fields, covering an area of ∼60 arcmin2, has revealed 79 new candidate young star clusters in these portions of the M31 disk. Most of these clusters are small (≲5 pc), young (∼10-200 Myr) star groups located within large OB associations. We have estimated the reddening values and the ages of each candidate individually by fitting isochrones to the stellar photometry. We provide a catalog of the candidates including rough approximations of their reddenings and ages. We also look for patterns of cluster formation with galactocentric distance, but our rough estimates are not precise enough to reveal any clear patterns.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual (M31) - Galaxies: Spiral - Galaxies: Stellar Content - Galaxy: Open Clusters and Associations: General

VizieR on-line data: <Available at CDS (J/ApJ/559/851): table1.dat table4.dat>

Nomenclature: Table 4: M31SCC JHHMMSS+DDMMSSa N=80.

Simbad objects: 93

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Number of rows : 93
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 315 GlC 00 39 48.570 +40 31 30.45 16.304 16.581 16.090 15.755 15.298 ~ 54 1
2 M31SCC J003952+403141 Cl* 00 39 52.43 +40 31 41.3   20.41 20.25     ~ 3 0
3 M31OC J004000+403326 GlC 00 40 00.0113118360 +40 33 26.278910172   19.53 19.29     ~ 9 1
4 Bol 318 GlC 00 40 00.86 +40 34 08.0 16.845 17.236 16.915 16.751 16.472 ~ 37 1
5 M31SCC J004001+403420 Cl* 00 40 01.54 +40 34 20.1   20.83 20.51     ~ 3 0
6 Bol 319 GlC 00 40 02.9978476176 +40 33 57.931244604 17.453 17.775 17.379 17.123 16.705 ~ 42 1
7 M31SCC J004004+403440 Cl* 00 40 04.66 +40 34 40.5   21.10 21.01     ~ 3 0
8 M31SCC J004006+403508 Cl* 00 40 06.78 +40 35 08.4           ~ 3 0
9 M31GC J004010+403625 Gl? 00 40 10.2776194800 +40 36 26.167923756 18.573 18.833 18.433 18.161 17.704 ~ 13 0
10 M31SCC J004012+403632 Cl* 00 40 12.01 +40 36 32.6           ~ 2 0
11 M31SCC J004012+403617 Cl* 00 40 13.032 +40 36 19.27 18.763 19.27 18.711 18.427 17.998 ~ 5 0
12 M31SCC J004013+403815 Cl* 00 40 13.5946984877 +40 38 16.917761494 19.737   19.640 19.286 18.860 ~ 4 0
13 KWC 4 Gl? 00 40 15.371 +40 36 54.64 18.241 18.460 18.095 17.846 17.401 ~ 15 0
14 M31SCC J004032+403320 Cl* 00 40 32.93 +40 33 20.4           ~ 2 0
15 M31SCC J004033+403308a Cl* 00 40 33.28 +40 33 08.6           ~ 2 0
16 M31SCC J004033+403326 Cl* 00 40 33.46 +40 33 26.9           ~ 2 0
17 M31SCC J004033+403319 Cl* 00 40 33.48 +40 33 19.1           ~ 1 0
18 M31SCC J004033+403308b Cl* 00 40 33.51 +40 33 08.4           ~ 1 0
19 M31SCC J004033+403346 Cl* 00 40 33.70 +40 33 46.7           ~ 1 0
20 M31SCC J004034+403351 Cl* 00 40 34.62 +40 33 51.6   22.69 21.77   20.08 ~ 2 0
21 M31SCC J004035+403420 Cl* 00 40 35.45 +40 34 20.2           ~ 1 0
22 M31SCC J004035+403251 Cl* 00 40 35.51 +40 32 51.2           ~ 1 0
23 M31SCC J004039+403210 Cl* 00 40 39.35 +40 32 10.8           ~ 1 0
24 M31SCC J004040+403223 Cl* 00 40 40.43 +40 32 23.5           ~ 1 0
25 M31SCC J004040+403256 Cl* 00 40 40.67 +40 32 57.0           ~ 1 0
26 M31SCC J004041+403222 Cl* 00 40 41.35 +40 32 22.9           ~ 1 0
27 M31SCC J004117+403720 Cl* 00 41 17.21 +40 37 20.6           ~ 1 0
28 M31SCC J004119+403748 Cl* 00 41 19.57 +40 37 48.8           ~ 1 0
29 M31SCC J004121+403638 Cl* 00 41 21.37 +40 36 38.8           ~ 1 0
30 M31SCC J004123+403726 Cl* 00 41 23.89 +40 37 27.0           ~ 2 0
31 Bol 342 GlC 00 41 24.084 +40 36 47.01 17.939 18.205 17.881 17.691 17.442 ~ 44 1
32 M31SCC J004125+403723 Cl* 00 41 25.92 +40 37 23.7           ~ 1 0
33 M31SCC J004158+405738 Cl* 00 41 58.57 +40 57 38.5   21.80 21.69   21.37 ~ 2 0
34 M31SCC J004204+405826 Cl* 00 42 04.85 +40 58 26.4           ~ 1 0
35 KHM31 167 Cl* 00 42 05.59 +40 57 14.3   18.07 17.98   17.72 ~ 2 0
36 2MASS J00420568+4057031 As* 00 42 05.6921867952 +40 57 03.276045792   17.8 15.32 15.4 14.798 ~ 6 0
37 KHM31 168 Cl* 00 42 05.80 +40 56 59.1   21.24 20.77   19.69 ~ 2 0
38 M31SCC J004206+405649 Cl* 00 42 06.23 +40 56 49.4           ~ 1 0
39 M31SCC J004207+405801 Cl* 00 42 07.11 +40 58 01.3   18.74 18.70   18.53 ~ 2 0
40 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
41 M31SCC J004441+412701 Cl* 00 44 41.192 +41 27 02.80 18.37       18.75 ~ 7 0
42 [JSD2012] PC 1119 Cl* 00 44 41.328 +41 51 37.42 20.77 21.17 21.12   21.40 ~ 6 0
43 M31SCC J004441+415239 Cl* 00 44 41.625 +41 52 39.30 19.12       19.58 ~ 8 0
44 M31OC J004442+415122 Cl* 00 44 41.840 +41 51 22.73 20.60 20.66 20.26   19.07 ~ 9 0
45 M31OC J004442+415237 Cl* 00 44 42.265 +41 52 36.96 19.47 19.76 19.51   19.54 ~ 7 0
46 KHM31 210 Cl* 00 44 42.501 +41 51 53.41 19.59 20.28 20.11   19.78 ~ 8 0
47 M31SCC J004444+412749 Cl* 00 44 44.86 +41 27 49.3           ~ 1 0
48 M31SCC J004445+412800 Cl* 00 44 45.07 +41 28 00.5           ~ 1 0
49 M31SCC J004445+415121 Cl* 00 44 45.39 +41 51 21.4           ~ 1 0
50 M31SCC J004445+415208 Cl* 00 44 45.68 +41 52 08.6           ~ 1 0
51 M31SCC J004445+415107 Cl* 00 44 45.73 +41 51 07.9   22.01 21.58     ~ 2 0
52 M31SCC J004447+415238 Cl* 00 44 47.052 +41 52 38.47 20.81       20.27 ~ 5 0
53 KHM31 537 Cl* 00 44 47.300 +41 28 23.92 17.46 18.62 18.68   18.46 ~ 7 0
54 M31SCC J004447+412843 Cl* 00 44 47.762 +41 28 41.92 16.90       18.44 ~ 5 0
55 Bol 368 GlC 00 44 47.80 +41 51 09.1 17.851 18.288 18.05 18.035 17.839 ~ 40 1
56 KHM31 229 Cl* 00 44 48.43 +41 29 25.1   22.27 22.06     ~ 2 0
57 KHM31 541 Cl* 00 44 49.067 +41 30 34.98 18.89 20.05 19.70   19.21 ~ 8 0
58 M31SCC J004449+412924 Cl* 00 44 49.25 +41 29 25.0           ~ 1 0
59 M31SCC J004449+415131 Cl* 00 44 49.86 +41 51 31.4           ~ 1 0
60 M31OC J004450+415211 Cl* 00 44 50.267 +41 52 11.27 20.93 20.80 20.57   19.99 ~ 7 0
61 M31SCC J004450+412917 Cl* 00 44 50.38 +41 29 18.0           ~ 1 0
62 M31SCC J004450+412914 Cl* 00 44 51.021 +41 29 15.53 17.05       18.84 ~ 5 0
63 M31SCC J004451+412924 Cl* 00 44 51.32 +41 29 24.8   17.82 17.80     ~ 2 0
64 M31SCC J004451+412911 Cl* 00 44 51.74 +41 29 11.4           ~ 1 0
65 M31SCC J004452+415144 Cl* 00 44 52.35 +41 51 44.2           ~ 1 0
66 M31SCC J004453+412927 Cl* 00 44 53.52 +41 29 27.8           ~ 1 0
67 M31SCC J004455+413127 Cl* 00 44 55.90 +41 31 27.2           ~ 1 0
68 M31SCC J004456+413121 Cl* 00 44 56.02 +41 31 21.5           ~ 1 0
69 M31SCC J004457+413123 Cl* 00 44 57.73 +41 31 23.3           ~ 1 0
70 M31SCC J004458+413049 Cl* 00 44 58.97 +41 30 49.2   20.17 20.35     ~ 2 0
71 M31SCC J004500+413057 * 00 45 00.93 +41 30 57.7   19.41 19.07     ~ 3 0
72 M31SCC J004503+413408 Cl* 00 45 03.82 +41 34 08.5           ~ 1 0
73 KHM31 257 Cl* 00 45 03.967 +41 34 46.99   21.36 20.76   19.33 ~ 5 0
74 M31SCC J004506+413406 Cl* 00 45 06.32 +41 34 07.0           ~ 1 0
75 M31SCC J004506+413545 Cl* 00 45 06.73 +41 35 45.8           ~ 1 0
76 M31SCC J004509+413643 Cl* 00 45 09.82 +41 36 43.3           ~ 1 0
77 M31SCC J004509+413649 Cl* 00 45 09.82 +41 36 49.8           ~ 1 0
78 M31OC J004510+413646 As* 00 45 10.388 +41 36 46.40 16.58 18.35 18.36   17.80 ~ 8 0
79 [H81] B-312 As* 00 45 11.8 +41 37 13           ~ 1 0
80 [JSD2015] AP 955 Cl* 00 45 11.851 +41 37 12.54 16.84 18.52 17.67   17.29 ~ 8 0
81 M31SCC J004512+413715 Cl* 00 45 12.31 +41 37 15.8           ~ 2 0
82 M31SCC J004512+413716 Cl* 00 45 12.504 +41 37 16.98 17.35 18.21 17.61   16.12 ~ 6 0
83 M31SCC J004512+413723 Cl* 00 45 12.78 +41 37 23.4           ~ 1 0
84 M31SCC J004512+413727 Cl* 00 45 12.893 +41 37 28.61   20.35 20.03     ~ 6 0
85 M31SCC J004513+413735 As* 00 45 13.43 +41 37 36.0 17.53 18.10 17.60   16.89 ~ 11 1
86 KHM31 571 Cl* 00 45 14.127 +41 37 44.23 17.82 19.10 18.94   18.66 ~ 7 0
87 M31SCC J004514+413724 Cl* 00 45 14.3437296264 +41 37 24.901006764 18.62 20.28 21.73   18.95 ~ 11 0
88 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
89 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
90 [H81] B-306 As* ~ ~           ~ 1 0
91 [H81] B-301 As* ~ ~           ~ 1 0
92 [H81] B-310 As* ~ ~           ~ 1 0
93 [H81] B-298 As* ~ ~           ~ 1 0

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