Computer Science
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.208w&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Computer Science
Stellar Spectroscopy
Scientific paper
We report on a multiwavelength study of a partially embedded region of star formation centered on the Herbig Be star LkHα 101. Using two 40 ks Chandra observations, we detect 213 X-ray sources in the field. We combine the X-ray data with 2MASS near-IR observations and Spitzer IRAC and MIPS 24 micron observations to obtain a complete picture of the cluster. A total of 158 of the X-ray sources have infrared counterparts. Of these, we find 9 protostars, 48 Class II objects, 5 transition objects and 72 Class III objects. From the Spitzer data we identify an additional 10 protostars, 53 Class II objects and 4 transition disk candidates which are not detected by Chandra. We obtained optical spectra of a sample of these objects. Combining the X-ray, Spitzer and spectral data, we obtain independent estimates of cluster distance and the total cluster size - excluding protostars. We obtain consistent distance estimates of 510^{+100}_{-40} pc and a total cluster size of 255^{+50}_{-25} stars. We find the Class II:III ratio is about 5:7 with some evidence that the Class III sources are spatially more dispersed. The cluster appears very young with three sites of active star formation and a median age of about 1 Myr.
Bourke Tyler L.
Gutermuth Robert
Megeath Thomas S.
Osten Rachel
Spitzbart Bradley D.
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