EDP Sciences
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Volume 405, Number 2, July II 2003
Page(s) 563 - 569
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20030640

A&A 405, 563-569 (2003)
DOI: 10.1051/0004-6361:20030640

Young stars in the periphery of NGC 6822

P. Battinelli1, S. Demers2 and B. Letarte2

1  INAF, Osservatorio Astronomico di Roma Viale del Parco Mellini 84, 00136 Roma, Italia
2  Département de Physique, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada
    e-mail: demers@astro.umontreal.ca, bruno@astro.rug.nl

(Received 5 February 2003 / Accepted 25 March 2003 )

Taking advantage of the wide ( $42'\times 28'$) field of the CFH12K camera, we survey the young star population of NGC 6822 to unprecedented radial distances. We determine the age of the young stars by employing Gallart's et al. (1996b) method based on the presence of stars in different boxes in the CMD. We find that star formation took place up to ~200 Myr ago in a wide area not always matching the current HI cloud. A ~50 Myr old association is identified, next to the HI void where no young stars are seen.

Key words: galaxies: individual: NGC 6822 -- galaxies: stellar content -- galaxies: structure

Offprint request: P. Battinelli, battinel@oarhp1.rm.astro.it

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