New young star candidates in CG4 and Sa101

L. M. Rebull, C. H. Johnson, V. Hoette, J. S. Kim, S. Laine, M. Foster, R. Laher, M. Legassie, C. R. Mallory, K. McCarron, W. H. Sherry

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The CG4 and Sa101 regions together cover a region of ∼0.5deg 2 in the vicinity of a "cometary globule" that is part of the Gum Nebula. There are seven previously identified young stars in this region; we have searched for new young stars using mid- and far-infrared data (3.6-70 μm) from the Spitzer Space Telescope, combined with ground-based optical data and near-infrared data from the Two Micron All Sky Survey. We find infrared excesses in all six of the previously identified young stars in our maps and identify 16 more candidate young stars based on apparent infrared excesses. Most (73%) of the new young stars are Class II objects. There is a tighter grouping of young stars and young star candidates in the Sa101 region, in contrast to the CG4 region, where there are fewer young stars and young star candidates, and they are more dispersed. Few likely young objects are found in the "fingers" of the dust being disturbed by the ionization front from the heart of the Gum Nebula.

Original languageEnglish (US)
Article number25
JournalAstronomical Journal
Volume142
Issue number1
DOIs
StatePublished - Jul 2011
Externally publishedYes

Keywords

  • circumstellar matter
  • infrared: stars
  • stars: formation
  • stars: pre-main sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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