Photometry in the cometary globule Ori I-2 Virtual Observatory Resource

Authors
  1. Mookerjea B.
  2. Sandell G.
  3. Published by
    CDS
Abstract

We investigate the young stellar population in and near the cometary globule Ori I-2. The analysis is based on deep Nordic Optical Telescope R-band and H{alpha} images, JCMT SCUBA 450 and 850um images combined with near-infrared Two Micron All Sky Survey (2MASS) photometry and mid-infrared archival Spitzer images obtained with the Infrared Array Camera (IRAC; 3.6, 4.5, 5.8, and 8um), and MIPS (24 and 70um) instruments. We identify a total of 125 sources within the 5'x5' region imaged by the IRAC. Of these sources, 87 are detected in the R-band image and 51 are detected in the 2MASS. Ori I-2 shows clear evidence of triggered star formation with four young low-luminosity pre-main-sequence (PMS) stars embedded in the globule. At least two, possibly as many as four, additional low-mass PMS objects were discovered in the field which are probably part of the young {sigma} Orionis cluster. Among the PMS stars which have formed in the globule, MIR-54 is a young, deeply embedded Class 0/I object; MIR-51 and 52 are young Class II sources, while MIR-89 is a more evolved, heavily extincted Class II object with its apparent colors mimicking a Class 0/I object. The Class 0/I object MIR-54 coincides with a previously known IRAS source and is a strong submillimeter source. It is most likely the source for the molecular outflow and the large parsec-scale Herbig-Haro (HH) flow. However, the nearby Class II source, MIR-52, which is strong a H{alpha} emission line star, also appears to drive an outflow approximately aligned with the outflow from MIR-54, and because of the proximity of the two outflows, either star could contribute. MIR-89 appears to excite a low-excitation HH object, HH 992, discovered for the first time in this study.

Keywords
  1. infrared-photometry
  2. molecular-clouds
  3. h-ii-regions
  4. pre-main-sequence-stars
Bibliographic source Bibcode
2009ApJ...706..896M
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/706/896
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/706/896
Document Object Identifer DOI
doi:10.26093/cds/vizier.17060896

Access

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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/706/896
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http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/706/896/table1?

History

2012-01-12T09:36:31Z
Resource record created
2012-01-12T09:36:31Z
Created
2018-02-01T11:50:43Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr