Computer Science
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sfet.confe..53s&link_type=abstract
"Star Formation in the Era of Three Great Observatories, meeting abstracts from the conference held July 13-15, 2005 in Cambridg
Computer Science
Scientific paper
The sigma Ori cluster is a cluster low-mass stars within the Orion OB1b group. At a age of about 3 Myrs, Orion OB1b is a fossil star forming region. Star formation is complete and the natal gas/dust has been cleared away. We use broad band photometry to statistically identify the low-mass pre-main sequence population of the Sigma Ori cluster. We find about 140 cluster members with masses between 0.2 and 1.0 Msun. We use likely members of the cluster to estimate a radius of 3 to 5 pc and a total mass of about 225 Msun. Photometric observations of low-mass cluster members (V>15) are very difficult in the inner 30" of the cluster because the 5 stars of the Sigma Ori multiple system are very bright (V=3.8 to V=6.7). We coadded a series of roughly half second V and I band exposures to create high dynamic range images that we could use to search for faint cluster members close to the central O star of the cluster. We report one new likely cluster member in the central 15" of the cluster.
Sherry William
Walter Frederick
Wolk Scott
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