Young stars near CG30 in the Gum Nebula Virtual Observatory Resource

Authors
  1. Yep A.C.
  2. White R.J.
  3. Published by
    CDS
Abstract

We have conducted a high-dispersion (R~34000) optical spectroscopic study of 10 young stars near the cometary globule CG 30 in the Gum Nebula, a diffuse HII region home to at least 32 cometary globules. All 10 spectroscopically observed stars at the nebula's northern edge are of low mass (spectral types M4.5-K5), have broad H{alpha} emission, and show spectral veiling. Eight of the 10 are classical T Tauri stars. We spectroscopically measure the photospheric properties of CG 30 IRS 4 inside CG 30. Though embedded, CG 30 IRS 4 is T Tauri-like, with relatively slow projected rotation and moderate veiling. Undepleted Li absorptions, strong H{alpha} emissions, and positions well above the main sequence on an H-R diagram suggest that the 10 stars are <~1Myr old. Using our measurements, previous spectroscopy, and previous photometry of 11 other young stars in the area, we determine stellar, kinematic, and accretion properties of a total of 21 young stars. Shared radial velocities, proper motions, distances, and ages suggest that 14 of the young stars (including CG 30 IRS 4) are kinematically related to CG 30. From Gaia DR2 distances to six of these stars, we derive a distance of 358.1+/-2.2pc to the cometary globule complex CG 30/31/38. The CG 30 association has an accretor fraction of 29%+/-14%, low for quiescent clusters of similar age but consistent with other irradiated clusters. The Gum Nebula's moderate radiation environment (G_0_=6.6_-2.7_^+3.2^ at CG 30) may be strong enough to shorten disk lifetimes.

Keywords
  1. pre-main-sequence-stars
  2. radial-velocity
  3. stellar-spectral-types
  4. stellar-ages
  5. line-intensities
Bibliographic source Bibcode
2020ApJ...889...50Y
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/889/50
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/889/50
Document Object Identifer DOI
doi:10.26093/cds/vizier.18890050

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/889/50
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/889/50
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/889/50
IVOA Table Access TAP
http://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).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/50/spsample?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/50/spsample?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/50/spsample?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/50/table67?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/50/table67?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/50/table67?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/50/table8?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/50/table8?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/50/table8?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/50/table9?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/50/table9?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/50/table9?

History

2021-11-10T13:20:56Z
Resource record created
2021-11-10T13:20:56Z
Created
2022-09-21T09:19:05Z
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