Refined classification for Orion A protostars Virtual Observatory Resource

Authors
  1. Lewis J.A.
  2. Lada C.J.
  3. Published by
    CDS
Abstract

In the list of young stellar objects (YSOs) compiled by Megeath et al. (2012, J/AJ/144/192) for the Orion A molecular cloud, only 44 out of 1208 sources found projected onto low extinction (A_K_<0.8mag) gas are identified as protostars. These objects are puzzling because protostars are not typically expected to be associated with extended low extinction material. Here, we use high resolution extinction maps generated from Herschel data, optical/infrared and Spitzer Space Telescope photometry and spectroscopy of the low extinction protostellar candidate sources to determine if they are likely true protostellar sources or contaminants. Out of 44 candidate objects, we determine that 10 sources are likely protostars, with the rest being more evolved YSOs (18), galaxies (4), false detections of nebulosity and cloud edges (9), or real sources for which more data are required to ascertain their nature (3). We find none of the confirmed protostars to be associated with recognizable dense cores and we briefly discuss possible origins for these orphaned objects.

Keywords
  1. young-stellar-objects
  2. molecular-clouds
  3. extinction
Bibliographic source Bibcode
2016ApJ...825...91L
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/825/91
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/825/91
Document Object Identifer DOI
doi:10.26093/cds/vizier.18250091

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/825/91
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/825/91
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/825/91
IVOA Table Access TAP
https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/825/91/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/825/91/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/825/91/table1?

History

2016-10-11T14:36:54Z
Resource record created
2016-10-11T14:36:54Z
Created
2017-12-05T05:10:21Z
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