2020MNRAS.494..458Z -
Mon. Not. R. Astron. Soc., 494, 458-486 (2020/May-1)
The VMC survey - XXXVI. Young stellar variability in the Large Magellanic Cloud.
ZIVKOV V., OLIVEIRA J.M., PETR-GOTZENS M.G., RUBELE S., CIONI M.-R.L., VAN LOON J.T., DE GRIJS R., EMERSON J., IVANOV V.D., MARCONI M., MORETTI M.I., RIPEPI V., NIEDERHOFER F. and SUN N.-C.
Abstract (from CDS):
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 deg2 region of the Large Magellanic Cloud (LMC). The aim is to investigate whether the different environmental conditions in the metal-poor LMC (∼0.4-0.5 Z☉) 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 χ2-analysis, stellar variability was identified. We found 3062 candidate variable stars from a population of 362 425 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 (>3σ) 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 ΔKs>1mag), not what would have been expected from the typically larger mass accretion rates observed in the Magellanic Clouds.
Abstract Copyright:
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
techniques: photometric - stars: pre-main-sequence - stars: variables: general - galaxies: individual: LMC - infrared: stars
VizieR on-line data:
<Available at CDS (J/MNRAS/494/458): tablea3.dat>
Nomenclature:
Table A3: [ZOP2020] NNNNNNN N=3062 among (Nos 103-1914219).
Simbad objects:
857
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