Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812505b&link_type=abstract
American Astronomical Society, AAS Meeting #218, #125.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present our preliminary results of an optical survey of the W4 star forming region. W4 is an H II region located at a distance of about 2 kpc. Its central young star-forming cluster, IC 1805, contains well-studied massive stars making this an ideal region for studying the relationship between high- and low-mass star formation. As part of the W3/W4/W5 star-forming complex, stellar populations in the W4 region provide an opportunity to study the possibility of triggered star formation. We have performed an optical imaging survey of these regions using the 90Prime imager at the Bok telescope. Our preliminary results focus on intermediate to low-mass populations of W4. This work is part of a larger project to study the star-formation history, initial mass function, and circumstellar disk evolution of the W3/W4/W5 complex. Our observations are sensitive down to about 0.5 solar masses. We select candidate pre-main sequence stars based on their location in V-I, V color-magnitude diagrams compared to model isochrones. Preliminary tests have found about 1500 candidate stars with initial age estimates less than 3 Myr. We use infra-red data from the 2MASS catalog and the Spitzer Space Telescope to estimate the circumstellar disk frequency as a function of age and mass in this region. X-ray data from the Chandra X-ray Observatory also help select candidate young stars. These candidates will be targeted for optical spectroscopy to better determine stellar masses and ages. Here we present the spatial distribution of both confirmed and candidate young stars in the W4 star-forming region.
Bagley Micaela
Bagley Micaela B.
Kim Jinyoung Serena
Meyer Michael R.
Sherry William Henry
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