VMC XXXVI. Young stellar variability in LMC Virtual Observatory Resource

Authors
  1. Zivkov V.
  2. Oliveira J.M.
  3. Petr-Gotzens M.G.
  4. Rubele S.
  5. Cioni M.-R.L.,van Loon J.T.
  6. de Grijs R.
  7. Emerson J.
  8. Ivanov V.D.
  9. Marconi M.,Moretti M.I.
  10. Ripepi V.
  11. Niederhofer F.
  12. Sun N.-C.
  13. Published by
    CDS
Abstract

Studies of young stellar objects (YSOs) in the Galaxy have found that a significant fraction exhibits photometric variability. However, no systematic investigation has been conducted on the variability of extragalactic YSOs. Here we present the first variability study of massive YSOs in an ~1.5 square degree region of the Large Magellanic Cloud (LMC). The aim is to investigate whether the different environmental conditions in the metal-poor LMC (~0.4-0.5Z_{sun}_) have an impact on the variability characteristics. Multi-epoch near-infrared (NIR) photometry was obtained from the VISTA Survey of the Magellanic Clouds (VMC) and our own monitoring campaign using the VISTA telescope. By applying a reduced {Chi}-square-analysis, stellar variability was identified. We found 3062 candidate variable stars from a population of 362425 stars detected. Based on several Spitzer studies, we compiled a sample of high-reliability massive YSOs: a total of 173 massive YSOs have NIR counterparts (down to Ks~18.5mag) in the VMC catalogue, of which 39 display significant (>3{sigma}) variability. They have been classified as eruptive, fader, dipper, short-term variable, and long-period variable YSOs based mostly on the appearance of their Ks-band light curves. The majority of YSOs are aperiodic; only five YSOs exhibit periodic light curves. The observed amplitudes are comparable or smaller than those for Galactic YSOs (only two Magellanic YSOs exhibit {Delta}Ks>1mag), not what would have been expected from the typically larger mass accretion rates observed in the Magellanic Clouds.

Keywords
  1. Magellanic Clouds
  2. Variable stars
  3. Photometry
Bibliographic source Bibcode
2020MNRAS.494..458Z
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/494/458
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/494/458

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/494/458
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/494/458
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/494/458
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/MNRAS/494/458/tablea3?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/494/458/tablea3?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/494/458/tablea3?

History

2020-12-17T10:40:21Z
Resource record created
2020-12-17T10:40:21Z
Created
2022-12-14T07:46:27Z
Updated

Contact

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CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
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