Sub-clustering Among the Low Mass Members of the Orion OB1b Association II

Details Sub-clustering Among the Low Mass Members of the Orion OB1b Association II Sub-clustering Among the Low Mass Members of the Orion OB1b Association II

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..139s&link_type=abstract

NOAO Proposal ID #1999B-0139

Computer Science

Scientific paper

Low mass star formation occurs primarily in OB associations (Walter et al. 1999). Studies of OB associations are crucial to our understanding of the environment in which a typical low mass star is born. Two of the most important environmental factors which are likely to affect the course of low mass star formation in an OB association are: the distance from the O and B stars; and the spatial density of young stars. Both of these factors are strongly affected by the degree to which low mass stars cluster around the O and B stars. The best places to study low mass star formation are the Orion OB1a and OB1b sub- associations. These are fossil star formation regions where star formation is complete and there is very little extinction (Walter et al. 1999). Walter et al. (1998) found a cluster of low mass pre-main sequence stars around the O9.5V star σ Orionis. We have expanded the photometric survey to cover the regions around ζ, (epsilon), (delta) Orionis, and a few fields between those stars. We propose to complete our survey of the Orion OB1b sub-association by including areas away from the O and B stars of the Orion OB1b sub-association. This will allow us to develop a better picture of star formation throughout the OB1b sub-association.

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