1996A&A...306..125C


Query : 1996A&A...306..125C

1996A&A...306..125C - Astronomy and Astrophysics, volume 306, 125-133 (1996/2-1)

Ultraviolet ages of young clusters in the Magellanic Clouds.

CASSATELLA A., BARBERO J., BROCATO E., CASTELLANI V. and GEYER E.H.

Abstract (from CDS):

Following a previous investigation on the integrated UV colours of stellar clusters (Barbero et al. 1990), we study the calibration of the ultraviolet colour index C(15-31) in terms of cluster age, using observations by the International Ultraviolet Explorer of 29 young and populous clusters of the Large Magellanic Cloud (LMC), and of the Small Magellanic Cloud (SMC). The study is limited to the range of ages 5x106 to 8x108yr, which is free from contamination by Horizontal Branch stars. It is shown that in this range of ages the theoretical sequence C(15-31) vs. age agrees well with the one derived by combining the observed colour index C(15-31) with the ages determined via isochrone fitting to the colour-magnitude diagrams while systematic differences, which are discussed on here, exist with respect to the age calibration by Meurer, Cacciari and Freeman (1990). The present age calibration C(15-31) vs. log(t), provided in an analytical form, is finally used to determine the ages of the 29 clusters in our sample, including 13 objects for which no determination was avaiblable via the isochrone fitting method.

Abstract Copyright:

Journal keyword(s): galaxies: star clusters - Magellanic Clouds - stars: evolution - ultraviolet: stars

Simbad objects: 33

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Number of rows : 33
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10381 1
2 NGC 330 Cl* 00 56 20.59 -72 27 12.5 9.37 9.76 9.55   8.89 ~ 390 0
3 LHA 115-S 26 Cl* 00 57 30.00 -72 15 53.0 11.29       11.34 ~ 40 1
4 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 468 0
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6418 1
6 NGC 1711 Cl* 04 50 37.320 -69 59 01.72   11.22 11.10     ~ 111 0
7 NGC 1755 Cl* 04 55 16.390 -68 12 23.12   10.00 9.85     ~ 71 0
8 NGC 1774 Cl* 04 58 06.120 -67 14 27.40   10.96 10.76     ~ 36 0
9 HD 268850 AB* 05 02 21.4730341272 -66 06 38.294439372   11.83 11.55 12.43   ~ 88 0
10 NGC 1805 GlC 05 02 21.690 -66 06 39.43           ~ 108 0
11 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 250 0
12 NGC 1850 Cl* 05 08 50.190 -68 45 35.65   8.84 8.96     ~ 252 1
13 NGC 1855 Cl* 05 09 21.180 -68 50 39.56   10.18 10.39     ~ 76 0
14 NGC 1856 Cl* 05 09 30.290 -69 07 45.08   10.40 10.06     ~ 147 0
15 NGC 1866 GlC 05 13 38.920 -65 27 52.75           ~ 404 0
16 OGLE-CL LMC 316 Cl* 05 17 43.83 -69 34 06.1   11.59 11.48     ~ 15 0
17 OGLE-CL LMC 328 Cl* 05 18 11.41 -69 13 05.7   9.39 9.54     ~ 22 0
18 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16265 1
19 NGC 1951 Cl* 05 26 06.766752 -66 35 47.80500           ~ 33 0
20 NGC 1967 Cl* 05 26 43.320 -69 05 51.98   10.80 10.81     ~ 24 0
21 NGC 1968 As* 05 27 23 -67 28.3   8.29 8.22     ~ 39 0
22 NGC 1984 Cl* 05 27 40 -69 08.1   10.00 9.99     ~ 77 0
23 NGC 1983 Cl* 05 27 44 -68 59.1           ~ 52 0
24 NGC 1974 Cl* 05 27 59.00 -67 25 26.9     10.30     ~ 26 0
25 NGC 1994 Cl* 05 28 22.7 -69 08 32           ~ 47 0
26 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 270 0
27 NGC 2018 As* 05 31 24.00 -71 04 24.0   10.91 10.89     ~ 103 1
28 NGC 2041 Cl* 05 36 28.090 -66 59 29.73   10.58 10.36     ~ 38 0
29 NGC 2100 Cl* 05 42 07.200 -69 12 26.99   9.6       ~ 186 0
30 NGC 2134 Cl* 05 51 55.950 -71 05 53.57   11.05       ~ 72 0
31 NGC 2157 Cl* 05 57 35.430 -69 11 48.67   10.35 10.16     ~ 120 0
32 NGC 2164 OpC 05 58 55.900 -68 30 58.09   10.44 10.34     ~ 118 0
33 NGC 2214 OpC 06 12 57 -68 15.6   11.04 10.93     ~ 119 0

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