Spitzer and X-ray Observations of Star Forming Regions
First Author:
Scott Wolk
Email: swolk AT cfa.harvard.edu
Harvard-Smithsonian Center for Astrophysics
60 Garden Street
Cambridge MA, 02138 USA
Coauthors:
Abstract
We examine the properties of several embedded clusters within 2 kpc using data the Spitzer Space Telescope supplemented by data from theXMM-Newton and Chandra X-ray observatories. The clouds range from massive star forming regions - RCW38, RCW108, through large complexes (e.g. L1641) to smaller clusters (e.g. LkHa 101, IRAS20050). We use surveys of entire molecular clouds to understand the range and distribution of cluster membership, size, and surface density. The data demonstrate clearly that there is a continuum of star-forming environments, from relative isolation to dense clusters. Using the combined Spitzer and X-ray data allows a very accurate assessment of cluster size. In L1641, we estimate total number of Class III objects to be as high as 1400. Combined with the Spitzer identified sources we determine that there are nearly 2000 PMS stars south of the ONC. In other regions, we have detected differences in the spatial distributions of Class II and Class III objects (a.k.a. classical and naked T Tauri stars). Comparison of the class fraction as a function of cluster age is crucial to understanding disk evolution. We are performing detailed X-ray analysis of objects identified via Spitzer data as transition disks. These analysis allow us to start the process of understanding the high energy environment in this crucial planetbuilding stage.
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