Zivkov, V, Oliveira, JM ORCID: https://orcid.org/0000-0002-0861-7094, Petr-Gotzens, MG, Rubele, S, Cioni, M-RL, van Loon, JT ORCID: https://orcid.org/0000-0002-1272-3017, de Grijs, R, Emerson, J, Ivanov, VD, Marconi, M, Moretti, MI, Ripepi, V, Niederhofer, F and Sun, N-C (2020) The VMC survey – XXXVI. Young stellar variability in the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 494 (1). 458 -486.

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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 $\sim 1.5\, \mathrmdeg^2$ region of the Large Magellanic Cloud (LMC). The aim is to investigate whether the different environmental conditions in the metal-poor LMC ($\sim 0.4\!-\!0.5\, \mathrmZ_ødot $) 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 $K_s\sim 18.5\,$mag) 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 $Δ K_s\gt 1\,$mag), not what would have been expected from the typically larger mass accretion rates observed in the Magellanic Clouds.

Item Type: Article
Additional Information: This article has been accepted for publication in the Monthly Notices of the Royal Astronomical Society © 2020, published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: techniques: photometric; stars: pre-main-sequence; stars: variables: general; galaxies: individual: LMC; infrared: stars
Subjects: Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 28 May 2020 10:51
Last Modified: 11 Jun 2020 10:03
URI: https://eprints.keele.ac.uk/id/eprint/8050

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