Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546329b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #463.29; Bulletin of the American Astronomical Society, Vol. 36, p.1115
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the preliminary results of a panchromatic study of the cluster NGC 3603 based on observations obtained with the Wide Field Camera 3 (WFC3) on board the HST. The data cover an area of about 2' x 2' in various broad- and narrow-band filters at visible and near infrared wavelengths (V, R, Halpha, I, J, H). We use these data to derive accurate photometry and build colour-magnitude diagrams and luminosity functions that allow us to study the properties of star formation in this field. The observations reveal a population of very red objects with excess Halpha emission that we classify as bona-fide PMS stars. Comparison with theoretical evolutionary tracks indicates an age of 1 - 3 Myr and masses in the range from 0.2 to 2 Msolar. Thanks to their Halpha emission, we can separate these objects from older field stars and determine their initial mass function and how it varies with position inside the cluster.
This paper is based on Early Release Science observations made by the WFC3 Scientific Oversight Committee. We are grateful to the Director of the Space Telescope Science Institute for awarding Director's Discretionary time for this programme.
Andersen Morten
Beccari Giacomo
de Marchi Guido
Paresce Francesco
Sirianni Marco
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