J/MNRAS/494/458 VMC XXXVI. Young stellar variability in LMC (Zivkov+, 2020)
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., Sun N.-C.
<Mon. Not. R. Astron. Soc. 494, 458-486 (2020)>
=2020MNRAS.494..458Z 2020MNRAS.494..458Z (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry
Keywords: techniques: photometric - stars: pre-main-sequence -
stars: variables: general - galaxies: individual: LMC -
infrared: stars
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☉) 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 Χ-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 (>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.
Description:
Near-infrared photometric parameters for 3062 variable star candidates
in the Large Magellanic Cloud are presented. The data is based on
multi-epoch observations with the 4.1m VISTA telescope using the Y, J,
and K_s bands. For each source catalogue ID, equatorial coordinates,
magnitudes in YJK_s bands, the band(s) in which the source was
identified as variable, amplitudes in J and Ks, and type of variable
according to OGLE (if applicable) are given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea3.dat 100 3062 Properties of the LMC 7_5 variables
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See also:
II/351 : VISTA Magellanic Survey (VMC) catalog (Cioni+, 2011)
Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ID Catalogue ID
9- 20 F12.9 deg RAdeg Right ascension (J2000.0)
22- 34 F13.9 deg DEdeg Declination (J2000.0)
36- 42 F7.3 mag Ymag ?=-99.999 Apparent magnitude in Y filter
44- 50 F7.3 mag Jmag ?=-99.999 Apparent magnitude in J filter
52- 58 F7.3 mag Ksmag ?=-99.999 Apparent magnitude in Ks filter
60- 63 A4 --- VarBands Band(s) in which the variability was identified
65- 74 F10.7 mag Jamp ?=-1.0 Observed amplitude in J filter
76- 85 F10.7 mag Ksamp ?=-1.0 Observed amplitude in Ks filter
87-100 A14 --- VarType ?=- Type of variable according to OGLE
database (1)
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Note (1): For long period variables (LPV) the OGLE-III database was used.
All other types are based on data from the OGLE-IV database.
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Acknowledgements:
Viktor Zivkov, viktor.zivkov(at)web.de
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(End) Patricia Vannier [CDS] 20-Apr-2020