HST Observations of the Field Star Population in the Large Magellanic Cloud

Details HST Observations of the Field Star Population in the Large Magellanic Cloud HST Observations of the Field Star Population in the Large Magellanic Cloud

1997-05-20

arxiv.org/abs/astro-ph/9705149v1

Astronomy and Astrophysics

Astrophysics

18 pages, 7 figures: only 3 available ellectronically - complete copies by request from elson@ast.cam.ac.uk

Scientific paper

We present $V$ and $I$ photometry, obtained with the Hubble Space Telescope, for $\sim 15,800$ stars in a field in the inner disk of the Large Magellanic Cloud. We confirm previous results indicating that an intense star formation event, probably corresponding to the formation of the LMC disk, occurred a few times $10^9$ years ago. We find a small but real difference between our field and one further out in the disk observed by Gallagher et al (1996): either star formation in the inner disk commenced slightly earlier, or the stars are slightly more metal rich. We also find evidence for a later burst, around 1 Gyr ago, which may correspond to the formation of the LMC bar. About 5% of the stars in our field are substantially older than either burst, and are probably members of an old disk or halo population with age $\sim 12$ Gyr.

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