2002A&A...386..576E

Query : 2002A&A...386..576E

2002A&A...386..576E - Astronomy and Astrophysics, volume 386576-582 (2002/5-1)

The blue to red supergiant ratio in young clusters at various metallicities.

EGGENBERGER P., MEYNET G. and MAEDER A.

Abstract (from CDS):

We present new determinations of the blue to red supergiant ratio (B/R) in young open clusters at various metallicities. For this purpose, we examine the HR diagrams of 45 clusters in the Galaxy and of 4 clusters in the Magellanic Clouds. The identification of supergiants is based on spectroscopic measurements (with photometric counts to check the results). The new counts confirm the increase of the B/R ratio when the metallicity increases with the following normalized relation: (B/R)/((B/R)☉)≃0.05.e3(Z)/(Z☉_)^, where Z☉=0.02 and (B/R)☉ is the value of B/R at Z☉ which depends on the definition of B and R and on the age interval considered (e.g. for spectroscopic counts including clusters with logage between 6.8 and 7.5, (B/R)☉≃3 when B includes O, B and A supergiants).

Abstract Copyright: ∼

Journal keyword(s): stars: evolution - stars: supergiants - galaxies: Magellanic Clouds

Simbad objects: 56

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Number of rows : 56
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 SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
3 NGC 457 OpC 01 19 32.4 +58 16 40   6.97 6.4     ~ 259 2
4 M 103 OpC 01 33 21.1 +60 39 13   7.72 7.4     ~ 212 0
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
6 NGC 654 OpC 01 44 01.5 +61 53 06   7.34 6.5     ~ 206 0
7 NGC 663 OpC 01 46 22.2 +61 12 53   7.78 7.1     ~ 269 0
8 NGC 869 OpC 02 18 57.0 +57 08 02           ~ 504 0
9 NGC 884 OpC 02 22 15.7 +57 08 59           ~ 503 0
10 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
11 NGC 957 OpC 02 33 25.4 +57 33 13   8.34 7.6     ~ 110 0
12 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 279 0
13 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
14 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 281 0
15 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
16 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
17 NGC 2100 Cl* 05 42 07.200 -69 12 26.99           ~ 195 0
18 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
19 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
20 Cl Collinder 121 OpC 06 56 20 -24 43.8   3.02 2.6     ~ 156 0
21 Cl Collinder 135 OpC 07 17 23.6 -36 57 23           ~ 124 0
22 NGC 2384 OpC 07 25 10 -21 01.3   7.47 7.4     ~ 80 0
23 NGC 2414 OpC 07 33 10.7 -15 26 56   8.33 7.9     ~ 87 0
24 NGC 2439 OpC 07 40 46.5 -31 41 36   7.31 6.9     ~ 150 0
25 Cl Ruprecht 55 OpC 08 12 27 -32 35.0   8.14 7.8     ~ 55 1
26 IC 2581 OpC 10 27 29.3 -57 37 31   4.79 4.3     ~ 143 0
27 NGC 3293 OpC 10 35 50.3 -58 14 04           ~ 327 0
28 Cl Bochum 10 OpC 10 42 14.2 -59 08 44   6.40 6.2     ~ 86 0
29 Cl Collinder 228 OpC 10 44 00 -60 05.2           ~ 211 0
30 Cl Trumpler 15 OpC 10 44 43.6 -59 22 07           ~ 229 0
31 Cl Trumpler 18 OpC 11 11 21.4 -60 38 36           ~ 98 0
32 NGC 3590 OpC 11 13 02.0 -60 47 22           ~ 91 0
33 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
34 NGC 3766 OpC 11 36 13.5 -61 36 42   5.66 5.3     ~ 222 0
35 IC 2944 OpC 11 38 20.00 -63 22 22.0           ~ 191 0
36 NGC 4755 OpC 12 53 39.2 -60 22 07           ~ 300 0
37 NGC 5281 OpC 13 46 25.8 -62 55 00   6.15 5.9     ~ 92 0
38 Cl Pismis 20 OpC 15 15 23.5 -59 04 23   8.69 7.8     ~ 103 0
39 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 0
40 Cl Trumpler 27 OpC 17 36 20 -33 31.0   8.24 6.7     ~ 100 1
41 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
42 M 20 OpC 18 02 42 -22 58.3           ~ 456 1
43 NGC 6523 Cl* 18 03.2 -24 23           ~ 187 1
44 NGC 6530 OpC 18 04 31 -24 21.5           ~ 443 0
45 NGC 6604 OpC 18 18 03 -12 14.5           ~ 146 0
46 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
47 M 18 OpC 18 19 56.2 -17 04 21           ~ 93 0
48 NGC 6664 OpC 18 36 32.4 -08 11 23   8.81 7.8     ~ 135 0
49 NGC 6823 OpC 19 43 11.3 +23 18 32   7.71 7.1     ~ 279 2
50 NGC 6871 OpC 20 06 07.9 +35 46 45   5.43 5.2     ~ 237 0
51 Cl Berkeley 87 OpC 20 21 35.0 +37 25 14           ~ 141 0
52 NGC 6910 OpC 20 23 12.2 +40 46 16           ~ 202 0
53 M 29 OpC 20 23 42.9 +38 29 25   7.30 6.6     ~ 256 0
54 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1
55 NGC 7235 OpC 22 12 20.5 +57 16 13   8.58 7.7     ~ 119 0
56 NGC 7419 OpC 22 54 19.0 +60 48 50     13.0     ~ 113 0

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