Low-mass star formation in the gum nebula: The CG 30/31/38 complex

Jinyoung Serena Kim, Frederick M. Walter, Scott J. Wolk

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We present photometric and spectroscopic results for the low-mass pre-main-sequence (PMS) stars with spectral types K-M in the cometary globule (CG) 30/31/38 complex. We obtained multiobject high-resolution spectra for the targets selected as possible PMS stars from multiwavelength photometry. We identified 11 PMS stars brighter than V = 16.5 with ages ≲5 Myr at a distance of approximately 200 pc. The spatial distribution of the PMS stars, CG clouds, and ionizing sources (0 stars and supernova remnants) suggests a possible triggered origin of the star formation in this region. We confirm the youth of the photometrically selected PMS stars using the lithium abundances. The radial velocities of the low-mass PMS stars are consistent with those of the cometary globules. Most of the PMS stars show weak Hα emission with W λ(Hα) < 10 Å. Only one out of the 11 PMS stars shows a moderate near-IR excess, which suggests a short survival time (t < 5 Myr) of circumstellar disks in this star-forming environment. In addition, we find five young late-type stars and one Ae star that have no obvious relation to the CG 30/31/38 complex. We also discuss a possible scenario of the star formation history in the CG 30/31/38 region.

Original languageEnglish (US)
Pages (from-to)1564-1579
Number of pages16
JournalAstronomical Journal
Volume129
Issue number3
DOIs
StatePublished - Mar 2005
Externally publishedYes

Keywords

  • Circumstellar matter
  • H II regions
  • ISM: globules
  • Stars: formation
  • Stars: low-mass, brown dwarfs
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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