On the evolutionary status of the LMC cluster NGC 2004

Details On the evolutionary status of the LMC cluster NGC 2004 On the evolutionary status of the LMC cluster NGC 2004

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295...63c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 1, p. 63-74

Astronomy and Astrophysics

Astronomy

11

Globular Clusters, Magellanic Clouds, Stellar Evolution, Stellar Luminosity, Stellar Temperature, Bolometers, Color-Magnitude Diagram, Hertzsprung-Russell Diagram, Iue, Spectrum Analysis, Star Formation, Ultraviolet Astronomy

Scientific paper

IUE observations of hot stars in the Large Magellanic Cloud (LMC) young cluster NGC 2004 have been used to derive effective temperatures and bolometric luminosities well below the turn-off. No star is found close to the upper main sequence. Massive stars appear arranged on a vertical sequence at temperatures much lower than those of the Zero-Age Main Sequence (ZAMS). Among the fainter objects, three lie on the ZAMS, and some may be in a pre-MS phase. The presence of red giants at luminosities much lower than that of the evolved blue giants, together with stars still approaching the main sequence, suggests a star formation process much more continuous in time than generally suspected.

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