Publication Date
2010
Journal or Book Title
The Astrophysical Journal
Abstract
Early Release Science observations of the cluster NGC 3603 with the WFC3 on the refurbished Hubble Space Telescope allow us to study its recent star formation history. Our analysis focuses on stars with Hα excess emission, a robust indicator of their pre-main sequence (PMS) accreting status. The comparison with theoretical PMS isochrones shows that 2/3 of the objects with Hα excess emission have ages from 1 to 10 Myr, with a median value of 3 Myr, while a surprising 1/3 of them are older than 10 Myr. The study of the spatial distribution of these PMS stars allows us to confirm their cluster membership and to statistically separate them from field stars. This result establishes unambiguously for the first time that star formation in and around the cluster has been ongoing for at least 10-20 Myr, at an apparently increasing rate.
DOI
https://doi.org/10.1088/0004-637X/720/2/1108
Pages
1108-
Volume
720
Issue
2
Recommended Citation
Beccari, G; Spezzi, L; De Marchi, G; Parseces, F; Young, E; Andersen, M; Panagia, N; Balick, B; and Calzetti, D, "PROGRESSIVE STAR FORMATION IN THE YOUNG GALACTIC SUPER STAR CLUSTER NGC 3603" (2010). The Astrophysical Journal. 948.
https://doi.org/10.1088/0004-637X/720/2/1108
Comments
This is the pre-published version harvested from ArXiv. The published version is located at http://iopscience.iop.org/0004-637X/720/2/1108/