2004MNRAS.355..475B

Query : 2004MNRAS.355..475B

2004MNRAS.355..475B - Mon. Not. R. Astron. Soc., 355, 475-484 (2004/December-1)

The young open cluster Markarian 50.

BAUME G., VAZQUEZ R.A. and CARRARO G.

Abstract (from CDS):

We report on a deep CCD UBV(RI)Cphotometric survey in the region of the young open cluster Markarian 50. The new photometric data allow us to extend the cluster membership down to V~ 17.5, about 2 mag deeper than any previous investigation. On the basis of these data we derive a distance d= 3460±350 pc (VO-MV= 12.7±0.2), which turns out to be only slightly lower than previous estimates. The cluster presents differential reddening, with E(B-V) values ranging from 0.69 to 1.1. The brightest member (HD 219460) is a double star, which we separate photometrically for the first time, providing individual magnitudes and colours for each component. One of them is a Wolf-Rayet (WR) star and, according to evolutionary models, the mass of its progenitor should be greater than ∼20 M☉. The age obtained for the cluster is 7.5±2 Myr and the mass function for the most massive stars (M > 1 M☉) presents a slope x~ 1.0.

Abstract Copyright: 2004 RAS

Journal keyword(s): stars: imaging - stars: individual: HD 219460 - stars: individual: WR 157 - stars: luminosity function, mass function - stars: Wolf-Rayet - open clusters and associations: individual: Markarian 50

Nomenclature: Table 3: Cl* Mrk 50 BVC NNN N=61 among (Nos 1-129).

CDS comments: Table 3: in WEBDA database, objects 'Cl* Mrk 50 BVC NNNN' among (Nos 2-1097), only those with a cross-identification 'Cl Mrk 50 NN' are in SIMBAD.

Simbad objects: 77

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Number of rows : 77
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 IC 1590 OpC 00 52 49.2 +56 37 42           ~ 70 0
2 PG 0231+051 WD* 02 33 41.3574299856 +05 18 43.649856216 14.562 15.776 16.096 16.267 16.639 DAO.6 149 0
3 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
4 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
5 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 0
6 Cl HM 1 OpC 17 19 00 -38 49.0           ~ 52 0
7 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
8 NGC 7510 OpC 23 11 03.7 +60 34 40   8.77 7.9     ~ 107 1
9 Cl Basel 3 43 * 23 14 51.3053253912 +60 30 40.547442312   12.81 11.62     ~ 3 0
10 Cl Basel 3 7 * 23 14 52.9645247016 +60 25 56.658110952   15.03 14.25     ~ 3 0
11 Cl Basel 3 4 * 23 14 53.7303241848 +60 27 16.069708620   16.95 15.94     ~ 2 0
12 Cl Basel 3 5 * 23 14 53.7389414184 +60 26 31.429655988   16.97 15.98     ~ 2 0
13 Cl Basel 3 8 * 23 14 54.5747797944 +60 24 51.184127772   15.12 14.32     ~ 3 0
14 Cl Basel 3 3 * 23 14 56.5113527304 +60 27 46.112996556   16.43 15.46     ~ 3 0
15 Cl Basel 3 6 * 23 14 57.7528181472 +60 26 19.342469940   16.67 15.91     ~ 3 0
16 Cl Basel 3 1 * 23 14 59.9038731552 +60 27 15.412272660 12.43 12.78 12.33     B1.5V 15 0
17 Cl Basel 3 2 * 23 15 00.1972530792 +60 27 41.474376936   14.79 13.34     ~ 3 0
18 Cl Basel 3 9 * 23 15 00.5747653824 +60 24 52.861183704   16.29 15.59     ~ 3 0
19 Cl Basel 3 38 * 23 15 02.7188177880 +60 28 23.551288140   15.82 15.08     ~ 5 0
20 Cl Basel 3 37 * 23 15 03.70 +60 27 49.0   17.28 15.96     ~ 2 0
21 Cl Basel 3 10 * 23 15 04.8954122016 +60 25 25.009369896   16.13 15.64     ~ 6 0
22 Cl Basel 3 29 * 23 15 07.5342271608 +60 26 40.563054564   15.72 14.81     ~ 3 0
23 Cl Basel 3 36 * 23 15 07.7419417632 +60 28 07.809056688   13.40 12.72     F5V 4 0
24 Cl Basel 3 28 * 23 15 08.7857639808 +60 26 04.999576812   14.91 14.10     ~ 3 0
25 BD+59 2682 * 23 15 08.9444809344 +60 25 16.414082580   11.3 11.1     A0 9 0
26 Cl Basel 3 12 * 23 15 09.7115772600 +60 25 29.482484952   14.14 13.67     ~ 6 0
27 Cl Basel 3 34 * 23 15 10.1632525656 +60 27 38.648246328   17.03 15.70     ~ 2 0
28 Cl Basel 3 44 * 23 15 10.5127984632 +60 30 10.150420572   13.90 12.45     ~ 3 0
29 Cl Basel 3 39 * 23 15 10.6314120792 +60 29 06.128743704   17.00 15.98     ~ 3 0
30 Cl Basel 3 13 * 23 15 11.1532463760 +60 25 00.059331432   16.87 16.09     ~ 4 0
31 Cl Mrk 50 31 * 23 15 11.9353998432 +60 26 46.634136396 11.58 11.85 11.09     B2 17 0
32 Cl Basel 3 45 * 23 15 12.0420508704 +60 30 23.917660704   14.25 13.21     ~ 3 0
33 HD 219460 ** 23 15 12.39033 +60 27 01.8129 10.23 10.51 9.89 9.563   B1II+WN4.5 135 0
34 HD 219460A * 23 15 12.3995306290 +60 27 01.845560649   10.97 10.57     B0.7II 128 0
35 Cl* Mrk 50 BVC 129 * 23 15 12.4534575672 +60 26 25.742088312   17.99 16.96     ~ 3 1
36 HD 219460B WR* 23 15 12.5454190406 +60 27 01.000751310   11.32 10.75     WN5 12 0
37 Cl Basel 3 27 * 23 15 12.7454334192 +60 26 10.871816964   14.12 13.40     ~ 3 0
38 Cl Basel 3 26 * 23 15 12.7454334192 +60 26 10.871816964   14.56 13.90 13.35   B3V 4 0
39 Cl Basel 3 40 * 23 15 12.7595123616 +60 29 06.102793428   16.43 15.67     ~ 3 0
40 Cl Basel 3 35 * 23 15 12.7758497808 +60 27 48.643872948   15.82 15.10     ~ 3 0
41 Cl Basel 3 33 * 23 15 13.1110077912 +60 27 29.035905300   16.43 15.48     ~ 3 0
42 Cl* Mrk 50 BVC 6 * 23 15 13.2088515840 +60 26 21.676671708   12.50 11.91     B1.5V 5 1
43 GSC 04279-02247 ** 23 15 13.21 +60 26 21.7 12.23 12.48 11.90     B2V 8 1
44 Cl* Mrk 50 BVC 23 * 23 15 13.5058178406 +60 27 00.004066169       13.73   ~ 3 0
45 Cl* Mrk 50 BVC 22 * 23 15 13.8819521952 +60 27 00.882471816       13.78   ~ 3 0
46 Cl Mrk 50 62 ** 23 15 13.89 +60 27 00.9   13.69 12.93     B3V 4 0
47 Cl Basel 3 30 * 23 15 14.4012884592 +60 26 18.266558136 12.55 12.91 12.42     B2V 14 0
48 Cl Mrk 50 OpC 23 15 14.5 +60 26 25   9.09 8.5     ~ 56 0
49 Cl Basel 3 32 * 23 15 14.8866846096 +60 27 22.584918132   13.61 12.85     ~ 3 0
50 Cl Basel 3 21 * 23 15 15.5411404512 +60 25 25.328099784   16.92 16.18     ~ 5 0
51 Cl Basel 3 14 * 23 15 15.5744720088 +60 23 32.771154588   16.51 15.86     ~ 2 0
52 Cl Basel 3 15 * 23 15 15.5856905448 +60 24 00.861474600   16.57 15.58     ~ 2 0
53 Cl Basel 3 25 * 23 15 16.4383416336 +60 26 21.764223276   14.34 13.79     B3V 8 0
54 LS III +60 56 * 23 15 16.6801114608 +60 26 07.239684984 10.7 11.14 10.68     B5 18 0
55 Cl Basel 3 20 * 23 15 16.9109128656 +60 24 58.445874684   13.45 12.71     ~ 3 0
56 Cl Mrk 50 22 * 23 15 17.5506858624 +60 25 56.281933020   16.64 16.07     ~ 6 0
57 Cl Basel 3 24 * 23 15 18.1084154064 +60 26 05.512537464   14.64 14.04     B8V 8 0
58 Cl Basel 3 41 * 23 15 18.19 +60 29 00.4   16.93 15.90     ~ 2 0
59 Cl Basel 3 16 * 23 15 18.5982982560 +60 24 18.061821000   13.50 12.94     ~ 3 0
60 Cl Basel 3 42 * 23 15 19.2239424408 +60 29 25.857170088   13.69 12.84     ~ 3 0
61 Cl Basel 3 60 * 23 15 20.0857606776 +60 25 57.316263096   16.99 16.25     ~ 4 0
62 Cl Basel 3 46 * 23 15 20.0986715616 +60 31 00.801039648   14.07 13.30     ~ 3 0
63 Cl Basel 3 57 * 23 15 20.5063420344 +60 26 54.724924356   16.69 15.90     ~ 3 0
64 Cl Basel 3 59 * 23 15 22.1247488112 +60 26 02.356492632   16.99 16.07     ~ 2 0
65 Cl Mrk 50 51 * 23 15 23.1482039880 +60 30 59.722423920   16.60 15.58     ~ 2 0
66 Cl Basel 3 55 * 23 15 24.8282237088 +60 27 54.300290040   15.59 14.82     ~ 3 0
67 Cl Basel 3 52 * 23 15 25.1510560608 +60 30 28.782290628   16.53 15.73     ~ 2 0
68 Cl Basel 3 19 * 23 15 27.4072512672 +60 24 48.258944028   15.44 14.97     ~ 3 0
69 Cl Basel 3 17 * 23 15 27.6511041288 +60 23 44.465692272   12.62 12.25     B0.5III 5 0
70 Cl Basel 3 53 * 23 15 28.7806104552 +60 30 06.953794488   16.71 15.83     ~ 2 0
71 Cl Basel 3 54 * 23 15 30.8469183000 +60 29 11.277083004   16.75 15.80     ~ 2 0
72 Cl Basel 3 18 * 23 15 30.8797349784 +60 23 41.417698740   14.70 14.20     ~ 3 0
73 Cl Basel 3 56 * 23 15 31.1759626152 +60 27 02.544218856   15.97 15.13     ~ 3 0
74 Cl Basel 3 58 * 23 15 32.1140634240 +60 25 48.931725864   15.62 14.84     ~ 3 0
75 LBN 111.14-00.72 HII 23 16 03.94 +60 02 00.9           ~ 102 2
76 SH 2-157 A HII 23 16.1 +60 02           ~ 10 0
77 Ass Cas OB 2 As* 23 20 +60.9           ~ 69 0

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