SIMBAD references

2005AJ....129.1564K - Astron. J., 129, 1564-1579 (2005/March-0)

Low-mass star formation in the Gum nebula: the CG 30/31/38 complex.


Abstract (from CDS):

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 (O 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 Wλ(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.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - ISM: H II Regions - ISM: Globules - Stars: Formation - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

Nomenclature: Table 1: KWW XRS NN (Nos 1-13). Table 2: KWW NNNN N=16 among 2205.

Status at CDS:  

Simbad objects: 35

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