POSTER PAPER 4.10
Triggered Low Mass Star Formation in the Gum Nebula: CG30/31/38 and CG4/6/SA101
Jinyoung Serena Kim, Frederick M. Walter, Scott J. Wolk
Institute: Dept. of Physics and Astronomy, State University of New York, Stony Brook, NY 11794-3800, USA
Institute: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Contact Email: serena@mail.ess.sunysb.edu
Abstract:
High mass stars can terminate low mass star formation (LMSF). However
the strong UV radiation, winds, and shocks can also trigger LMSF by
collapsing the denser cores of evaporating molecular clouds. Cometary
globules (CG) are these clouds with head-tail geometry, often seen in
HII regions in association with young stars.
High mass stars can terminate low mass star formation (LMSF), but can also
trigger it. The Gum Nebula is an excellent site to study how
high mass stars influence LMSF. The nebula contains SNRs, OB stars,
and cometary globules (CGs).
We present multi-wavelength photometric studies of selected regions
in CG30/31/38 and optical photometry on CG4/6/SA101.
We identify loci of likely pre-main sequence (PMS) stars
as well as near-IR excess sources from their color-magnitude and color-color
diagrams. CG4/6/SA101 is near Gamma2 Vel and Vela OB2, which may have
influenced its LMSF.
The X-ray sources around CG30/31/38 outline the heads of the CGs
pointing toward central ionizing sources. We find two parallel loci of candidate
PMS stars in which older ones may have disks while younger ones ( < 2Myr) may not.
This region has probably been influenced by Zeta Pup and/or the progenitor
of Vela SNR.
Index Keywords: Zeta Pup; Gamma2 Vel; Pre-main Sequence Stars; Cometary Globules
Previous: Jeffries
Next: Hempel
Up: Poster Index
Up: Top Index
Manuscript submitted: 2001-Sep-27
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.