1995A&A...298..427B

Query : 1995A&A...298..427B

1995A&A...298..427B - Astronomy and Astrophysics, volume 298427-437 (1995/6-2)

NGC 1978 in the LMC: the cluster and surrounding field.

BOMANS D.J., VALLENARI A. and DE BOER K.S.

Abstract (from CDS):

We present deep BVRI CCD photometry of the Large Magellanic Cloud cluster NGC 1978 and of fields immediately to the west. From the study of the colour-magnitude diagram and the luminosity function we derive for NGC 1978 an age of slightly more than 2Gyr and a metallicity of [Fe/H]=-0.4. NGC 1978 is, for a globular cluster, rather elliptical which had been explained by a merger origin. No age structure inside NGC 1978 was found, which limits this possibility to a merger of roughly coeval subunits. In the field indications for a higher star formation rate at 1x108 and 6x108yr exist 8' west of the cluster, while no such phases can be found near the cluster. At ages older than 2Gyr the star formation rate appears to have been the same in all analysed fields. On a broader scale, NGC 1978 seems to be one of the oldest of the LMC intermediate age clusters. A coherent redetermination of the ages of the oldest clusters of this age group underlines a sudden enhancement of the cluster formation rate in the LMC about 2 Gyr ago.

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Journal keyword(s): Magellanic Clouds - galaxies: star clusters - galaxies: stellar content - stars: luminosity function, mass function - globular clusters: individual: NGC 1978

Simbad objects: 23

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Number of rows : 23
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 HD 2007 * 00 24 13.0275861168 -16 46 12.051990192   9.67 9.46     A3III 28 0
2 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
3 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
4 KMHK 7 Cl* 04 32 38.640 -72 20 24.57     14.2     ~ 12 0
5 NGC 1651 GlC 04 37 32.530 -70 35 08.71   12.99 12.28     ~ 125 0
6 KMHK 213 Cl* 04 52 53.270 -71 39 26.18   13.73 13.44     ~ 11 0
7 NGC 1831 GlC 05 06 16.12 -64 55 06.9   11.52 11.18     ~ 167 0
8 ESO 85-63 Cl* 05 17 32.25 -63 25 14.6   14.43 13.65     ~ 14 0
9 ESO 119-61 Cl* 05 22 35.42 -61 52 45.9           ~ 12 0
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
11 KMHK 891 Cl* 05 24 17 -76 12.6   14.72 14.12     ~ 11 0
12 2MASX J05283953-7337514 GlC 05 28 39.531 -73 37 51.45   14.14 13.42     ~ 52 0
13 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 317 0
14 NAME LMC 4 Supergiant Shell sh 05 31 33 -66 40.5           ~ 183 0
15 NAME Hodge 4 GlC 05 32 25.64 -64 44 07.7     13.33     ~ 52 0
16 NAME E 2 Cl* 05 36 21.63 -61 47 19.0           ~ 15 0
17 NGC 2173 GlC 05 57 58 -72 58.7   12.74 11.88     ~ 148 0
18 ESO 121-3 Cl* 06 02 03.32 -60 31 25.6   14.91 14.04     ~ 118 0
19 NGC 2203 Cl* 06 04 42.17 -75 26 15.8   12.80 11.29     ~ 54 0
20 NGC 2193 Cl* 06 06 17.31 -65 05 55.5   14.13 13.42     ~ 48 0
21 ESO 86-61 Cl* 06 08 15 -62 59.3   14.94 14.15     ~ 38 0
22 NGC 2241 Cl* 06 22 53 -68 55.5   14.02 13.25     ~ 16 0
23 NGC 2257 Cl* 06 30 12.62 -64 19 40.0   13.24 12.62     ~ 228 0

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