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Astron. Astrophys. 330, 492-504 (1998)

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Evolutionary status and age spread in the young LMC cluster NGC 1850A *

V. Caloi and A. Cassatella

Istituto di Astrofisica Spaziale C.N.R., C.P. 67, I-00044 Frascati, Italy

Received 10 July 1997 / Accepted 1 October 1997


IUE spectra have been obtained for 15 members of the very young LMC cluster NGC 1850A. The extinction law toward the cluster is similar to the one generally accepted for the 30 Dor region. We derive the effective temperatures and bolometric luminosities to estimate the age and mass for each star. An age spread of 2 to 10 Myr is estimated, suggesting a more or less continuous star formation process. The cluster contains at least four objects with mass [FORMULA] 55 [FORMULA], still close to the main sequence. The age of the main cluster NGC 1850 is estimated to be about 50 Myr.

Key words: clusters: globular: NGC 1850A(LMC) – Magellanic Clouds – stars: evolution – UV: stars – galaxies: star clusters

* Based on observations collected by the International Ultraviolet Explorer (IUE) at the Villafranca Satellite Tracking Station of the European Space Agency.

Send offprint requests to: V. Caloi

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© European Southern Observatory (ESO) 1998

Online publication: January 16, 1998