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First results from XILO: XMM-Newton Investigations in the Lambda Orionis star forming region

Published online by Cambridge University Press:  21 October 2010

B. Stelzer
Affiliation:
INAF - Osservatorio Astronomico di Palermo, 90134 Palermo, Italy email: [email protected]
D. Barrado y Navascues
Affiliation:
LAEFF - INTA, 28691 Villanueva de la Canada, Spain
N. Huelamo
Affiliation:
LAEFF - INTA, 28691 Villanueva de la Canada, Spain
M. Morales-Calderon
Affiliation:
LAEFF - INTA, 28691 Villanueva de la Canada, Spain
A. Bayo
Affiliation:
LAEFF - INTA, 28691 Villanueva de la Canada, Spain
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The λ Orionis star formation region (1-6 Myr, 400 pc) is a complex of star-forming clouds surrounded by a molecular ring with ~ 5° radius which was probably formed by a supernova explosion (Dolan & Mathieu 2002). For a complete picture of star formation, believed to be determined by the supernova blast, the large-scale distribution of the pre-main sequence population in λ Ori needs to be examined. We have embarked on a multi-wavelength study (XMM-Newton/X-ray, CFHT/optical, Spitzer/IR) of selected areas within this intriguing star-forming complex that enables us to identify young stars and brown dwarfs. Our study comprises various areas within the cloud complex as shown in Fig.1. This data set is among the most extended X-ray surveys carried out with XMM-Newton in a coherent star-forming environment. The XMM-Newton observations combined with optical and IR data reveal the low-mass stellar population down to ~ 0.4 M. For this mass-limited sample, our preliminary analysis confirms the anomalously low disk-fraction of the central star cluster Coll 69, the Eastern extension of its low-mass population pointing towards B 35, and the concentration of young stars in front of B 35. The analysis of the ‘on-cloud field' of B 35 (white in the figure) will show if the cloud is currently forming stars. This will be crucial for determining the star-forming history in the whole λ Ori region.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010