Other
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..294s&link_type=abstract
NOAO Proposal ID #2001B-0294
Other
Scientific paper
OB associations are the typical natal environment of low-mass stars in our galaxy. Assuming a field inital mass functin, up to 90% of all stars < 10^7 years old are in OB associations (Walter et al. 2000; Preibisch & Zinnecker 2000). Models of low-mass star formation are generally based on observations of isolated stars in relatively calm T associations, not the much more energetic environments OB associations. The high spatial density of stars may affect the binary fraction as well as the lifetime and size of protoplanetary disks. Strong winds, UV radiation, and supernova blast waves erode protoplanetary disks and drive off gas that might otherwise accrete onto a low-mass PMS star. This may lead to fractions of very low-mass stars, brown dwarfs and planetary systems which differ from those in T associations. DeZeeuw et al. (1999) list only 17 OB associations within 1kpc of the sun. These associations are the best available laboratories to observe the typical natal environment of low-mass stars, yet many of these associations are virtually unstudied. One is the OB association Collinder 121 (Cr121 ), located 590pc from the Sun. We propose to use the CTIO 0.9m telescope to survey the low-mass PMS population between 0.04 and 2M_&sun;. These BVRI observations will compliment our proposed X-ray observations (M> 0.3M_&sun;) and extend our sample of PMS stars to below the hydrogen burning limit.
Sherry William Henry
Walter Frederick M.
Wolk Scott J.
No associations
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