1997A&A...317..448G

Query : 1997A&A...317..448G

1997A&A...317..448G - Astronomy and Astrophysics, volume 317448-458 (1997/1-2)

Be star surveys with CCD photometry. II. NGC 1818 and its neighbouring cluster in the Large Magellanic Cloud.

GREBEL E.K.

Abstract (from CDS):

As part of an ongoing photometric survey of young Magellanic Cloud clusters we identified Be stars in NGC 1818 and a nearby smaller cluster in the Large Magellanic Cloud. The neighbouring cluster does not appear to contain any evolved stars, and its sparsely populated main sequence does not extend to stars as massive as in NGC 1818. Both clusters are younger than the surrounding field population, but the current data do not allow to conclude whether NGC 1818 is a binary cluster or not. The small cluster is more heavily reddened than NGC 1818 indicating the presence of differential reddening, leftover gas and dust from the star formation process, or a larger distance. NGC 1818 does not seem to be significantly affected by differential reddening. We find both clusters to be rich in Be stars The field only contains very few Be stars as one would expect for a predominantly older population. NGC 1818 contains almost as many Be stars as the slightly younger SMC cluster NGC 330, while NGC 2004, a young LMC cluster, has a lower Be star content. We discuss problems in comparing Be star fractions in Magellanic Cloud clusters and Galactic open clusters and possible constraints on Be star theories.

Abstract Copyright: ∼

Journal keyword(s): galaxies: Magellanic Clouds - clusters: globular: individual: NGC 1818 (LMC) - galaxies: star clusters - stars: emission-line, Be - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/317/448): table2>

Nomenclature: Table 2: Cl* NGC 1818 GBe NN (Nos 1-72).

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 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
2 NGC 663 OpC 01 46 22.2 +61 12 53   7.78 7.1     ~ 269 0
3 NGC 869 OpC 02 18 57.0 +57 08 02           ~ 504 0
4 NGC 884 OpC 02 22 15.7 +57 08 59           ~ 503 0
5 NGC 1039 OpC 02 42 09.1 +42 44 02           ~ 467 0
6 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
7 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
8 NGC 1810 Cl* 05 03 23.680 -66 22 55.96   12.12 11.90     ~ 25 0
9 Cl* NGC 1818 GBE 71 * 05 03 58.651 -66 26 45.90   17.995 17.980     ~ 2 0
10 Cl* NGC 1818 GBE 68 * 05 04 01.329 -66 26 40.08   17.836 17.946     ~ 2 0
11 Cl* NGC 1818 GBE 9 * 05 04 01.590 -66 26 45.23   15.679 15.812     ~ 3 0
12 NGC 1818B Cl* 05 04 01.82 -66 26 46.1           ~ 3 0
13 Cl* NGC 1818 GBE 22 * 05 04 02.384 -66 26 41.44   16.478 16.583     ~ 5 0
14 Cl* NGC 1818 GBE 35 * 05 04 02.504 -66 26 48.06   17.176 17.185     ~ 4 0
15 Cl* NGC 1818 GBE 33 * 05 04 08.9603994277 -66 25 41.185673116 16.3038 17.056 17.162   17.162 ~ 3 0
16 Cl* NGC 1818 GBE 37 * 05 04 08.977 -66 26 00.05   17.047 17.192     ~ 5 0
17 Cl* NGC 1818 GBE 56 * 05 04 09.9 -66 26 07   17.6 17.68     ~ 1 0
18 Cl* NGC 1818 GBE 53 * 05 04 10.1 -66 26 08   17.59 17.63     ~ 2 0
19 Cl* NGC 1818 GBE 4 * 05 04 10.193 -66 26 17.26   15.108 15.062     ~ 5 0
20 Cl* NGC 1818 GBE 60 * 05 04 10.261 -66 25 33.47   17.755 17.876     ~ 2 0
21 Cl* NGC 1818 GBE 72 * 05 04 10.5 -66 26 09   18 18.02     ~ 1 0
22 Cl* NGC 1818 GBE 67 * 05 04 10.5 -66 25 51   17.94 17.94     ~ 1 0
23 Cl* NGC 1818 GBE 63 * 05 04 10.750 -66 25 38.71   17.83 17.806     ~ 2 0
24 Cl* NGC 1818 GBE 66 * 05 04 10.891 -66 25 24.20   17.886 17.933     ~ 3 0
25 Cl* NGC 1818 GBE 65 * 05 04 11.2 -66 26 04   17.79 17.83     ~ 1 0
26 Cl* NGC 1818 GBE 41 EB* 05 04 11.4803149860 -66 26 09.336639901   17.3 17.33     ~ 2 0
27 Cl* NGC 1818 GBE 13 * 05 04 11.487 -66 25 56.96   15.941 16.163     ~ 3 0
28 Cl* NGC 1818 GBE 49 * 05 04 11.846 -66 25 40.76   17.194 17.540     ~ 2 0
29 Cl* NGC 1818 GBE 59 * 05 04 11.9 -66 26 03   17.7 17.76     ~ 1 0
30 Cl* NGC 1818 GBE 36 * 05 04 11.9 -66 26 00   17.1 17.19     ~ 1 0
31 Cl* NGC 1818 GBE 54 * 05 04 12.0 -66 26 31   17.65 17.67     ~ 1 0
32 Cl* NGC 1818 GBE 18 * 05 04 12.102 -66 26 04.61   16.289 16.365     ~ 3 0
33 Cl* NGC 1818 GBE 39 * 05 04 12.106 -66 26 14.76   17.039 17.225     ~ 2 0
34 Cl* NGC 1818 GBE 25 * 05 04 12.398 -66 26 07.34   16.662 16.793     ~ 2 0
35 Cl* NGC 1818 GBE 61 * 05 04 12.5 -66 26 18   17.73 17.79     ~ 1 0
36 Cl* NGC 1818 GBE 48 * 05 04 12.5 -66 25 48   17.44 17.53     ~ 1 0
37 Cl* NGC 1818 GBE 20 * 05 04 12.6 -66 25 59   16.25 16.42     ~ 2 0
38 Cl* NGC 1818 GBE 27 * 05 04 12.7 -66 26 33   16.75 16.81     ~ 2 0
39 Cl* NGC 1818 GBE 47 * 05 04 12.8 -66 25 48   17.5 17.51     ~ 1 0
40 Cl* NGC 1818 GBE 38 * 05 04 12.853 -66 26 25.13   17.171 17.194     ~ 2 0
41 Cl* NGC 1818 GBE 28 * 05 04 12.9 -66 26 37   16.77 16.83     ~ 1 0
42 Cl* NGC 1818 GBE 7 * 05 04 13.015 -66 25 53.51   15.256 15.528     ~ 3 0
43 Cl* NGC 1818 GBE 12 * 05 04 13.1 -66 25 53   16.17 16.08     ~ 3 0
44 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 279 0
45 Cl* NGC 1818 GBE 16 * 05 04 13.3 -66 25 48   16.3 16.34     ~ 2 0
46 Cl* NGC 1818 GBE 40 * 05 04 13.4 -66 26 15   17.29 17.32     ~ 2 0
47 Cl* NGC 1818 GBE 14 * 05 04 13.6 -66 25 49   16.21 16.24     ~ 2 0
48 Cl* NGC 1818 GBE 30 * 05 04 13.658 -66 26 09.21   16.808 17.044     ~ 2 0
49 Cl* NGC 1818 GBE 3 * 05 04 13.771 -66 26 15.89   14.561 14.639     ~ 6 0
50 Cl* NGC 1818 GBE 19 * 05 04 13.9 -66 25 52   16.29 16.39     ~ 1 0
51 Cl* NGC 1818 GBE 26 * 05 04 13.909 -66 26 08.19   16.698 16.796     ~ 3 0
52 Cl* NGC 1818 GBE 8 * 05 04 14.153 -66 25 55.05   15.681 15.693     ~ 3 0
53 Cl* NGC 1818 GBE 5 * 05 04 14.264 -66 25 49.21   14.927 15.171     ~ 4 0
54 Cl* NGC 1818 GBE 62 * 05 04 14.3 -66 26 23   17.78 17.79     ~ 1 0
55 Cl* NGC 1818 GBE 34 * 05 04 14.351 -66 26 11.87   17.422 17.168     ~ 2 0
56 Cl* NGC 1818 GBE 29 * 05 04 14.396 -66 26 38.20   16.783 16.924     ~ 2 0
57 Cl* NGC 1818 GBE 23 * 05 04 14.421 -66 26 14.34   16.6 16.716     ~ 2 0
58 Cl* NGC 1818 GBE 1 * 05 04 14.493 -66 25 57.81   14.062 14.226     ~ 4 0
59 Cl* NGC 1818 GBE 51 * 05 04 14.8 -66 25 46   17.46 17.55     ~ 1 0
60 Cl* NGC 1818 GBE 6 * 05 04 15.0 -66 26 00   15.29 15.48     ~ 1 0
61 Cl* NGC 1818 GBE 43 * 05 04 15.165 -66 26 13.22   17.35 17.393     ~ 2 0
62 Cl* NGC 1818 GBE 2 * 05 04 15.239 -66 26 01.92   14.14 14.264     ~ 4 0
63 Cl* NGC 1818 KWBBE 1632 * 05 04 15.2830924489 -66 27 12.962657720 16.1724 17.348 17.40   17.315 ~ 6 0
64 Cl* NGC 1818 GBE 57 * 05 04 15.4 -66 26 20   17.68 17.74     ~ 1 0
65 Cl* NGC 1818 GBE 17 * 05 04 15.440 -66 25 45.63   16.14 16.346     ~ 4 0
66 Cl* NGC 1818 GBE 32 Pu* 05 04 15.6468383021 -66 26 23.195644212   16.903 17.118     ~ 3 0
67 Cl* NGC 1818 GBE 42 * 05 04 15.785 -66 25 43.38   17.306 17.362     ~ 2 0
68 Cl* NGC 1818 GBE 21 * 05 04 15.798 -66 26 06.67   16.44 16.572     ~ 2 0
69 Cl* NGC 1818 GBE 69 * 05 04 15.8 -66 26 10   17.9 17.96     ~ 1 0
70 Cl* NGC 1818 GBE 70 * 05 04 15.8 -66 25 54   17.78 17.96     ~ 1 0
71 Cl* NGC 1818 GBE 45 * 05 04 16.4 -66 26 48   17.38 17.41     ~ 1 0
72 Cl* NGC 1818 GBE 10 * 05 04 16.518 -66 26 01.34   15.619 15.819     ~ 4 0
73 Cl* NGC 1818 GBE 58 * 05 04 16.6 -66 26 17   17.7 17.75     ~ 1 0
74 Cl* NGC 1818 GBE 44 * 05 04 17.0 -66 25 10   17.39 17.40     ~ 1 0
75 Cl* NGC 1818 GBE 24 * 05 04 17.3 -66 26 21   16.71 16.73     ~ 2 0
76 Cl* NGC 1818 GBE 55 * 05 04 18.1 -66 25 51   17.62 17.68     ~ 1 0
77 Cl* NGC 1818 GBE 64 * 05 04 18.2 -66 26 22   17.75 17.81     ~ 1 0
78 Cl* NGC 1818 GBE 11 * 05 04 18.389 -66 26 08.28   15.785 15.875     ~ 2 0
79 Cl* NGC 1818 GBE 52 * 05 04 19.727 -66 27 20.44   17.505 17.620     ~ 2 0
80 Cl* NGC 1818 GBE 15 * 05 04 20.2655354184 -66 26 14.852666727 14.9870 16.269 16.293   16.085 ~ 6 0
81 Cl* NGC 1818 GBE 31 * 05 04 21.152 -66 26 25.71   16.972 17.115     ~ 2 0
82 Cl* NGC 1818 GBE 50 * 05 04 25.467 -66 26 34.71   17.453 17.544     ~ 2 0
83 KMHK 507 Cl* 05 04 45.540 -66 21 57.84   14.28 13.83     ~ 11 0
84 BRHT 27a Cl* 05 05 27.050 -66 29 38.03           ~ 10 0
85 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
86 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 281 0
87 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
88 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
89 M 41 OpC 06 46 03.1 -20 43 07   4.89 4.5     ~ 308 0
90 NGC 3766 OpC 11 36 13.5 -61 36 42   5.66 5.3     ~ 222 0
91 IC 2944 OpC 11 38 20.00 -63 22 22.0           ~ 191 0
92 NGC 4755 OpC 12 53 39.2 -60 22 07           ~ 300 0
93 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1

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