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Photometric variability of massive young stellar objects

Teixeira, G. D. C., Kumar, M.S.N., Smith, L., Lucas, P.W., Morris, C., Borissova, J., Monteiro, M. J. P. F. G., Carattie o Garatti, A., Contreras Peña, C., Froebrich, Dirk, and others. (2018) Photometric variability of massive young stellar objects. Astronomy and Astrophysics, 619 . Article Number 41. ISSN 0004-6361. E-ISSN 1432-0746. (doi:10.1051/0004-6361/201833667) (KAR id:69124)

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The Vista Variables in the Via Lactea (VVV) survey has allowed for an unprecedented number of multi-epoch observations of the southern Galactic plane. In a recent paper, 13 massive young stellar objects (MYSOs) have already been identified within the highly variable (?Ks > 1 mag) YSO sample of another published work. This study aims to understand the general nature of variability in MYSOs. Here we present the first systematic study of variability in a large sample of candidate MYSOs. We examined the data for variability of the putative driving sources of all known Spitzer extended green objects (EGOs; 270) and bright 24 ?m sources coinciding with the peak of 870 ?m detected ATLASGAL clumps (448), a total of 718 targets. Of these, 190 point sources (139 EGOs and 51 non-EGOs) displayed variability (IQR > 0.05, ?Ks > 0.15 mag). 111 and 79 light-curves were classified as periodic and aperiodic respectively. Light-curves have been sub-classified into eruptive, dipper, fader, short-term-variable and long-period-variable-YSO categories. Lomb-Scargle periodogram analysis of periodic light-curves was carried out. 1–870 ?m spectral energy distributions of all the variable sources were fitted with YSO models to obtain the representative properties of the variable sources. 41% of the variable sources are represented by > 4 M? objects, and only 6% were modelled as > 8 M? objects. The highest-mass objects are mostly non-EGOs, and deeply embedded, as indicated by nearly twice the extinction when compared with EGO sources. By placing them on the HR diagram we show that most of the lower mass, EGO type objects are concentrated on the putative birth-line position, while the luminous non-EGO type objects group around the zero-age-main-sequence track. Some of the most luminous far infrared (FIR) sources in the massive clumps and infrared quiet driving sources of EGOs have been missed out by this study owing to an uniform sample selection method. A high rate of detectable variability in EGO targets (139 out of 153 searched) implies that near-infrared variability in MYSOs is closely linked to the accretion phenomenon and outflow activity.

Item Type: Article
DOI/Identification number: 10.1051/0004-6361/201833667
Uncontrolled keywords: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Dirk Froebrich
Date Deposited: 17 Sep 2018 12:27 UTC
Last Modified: 03 Sep 2021 14:00 UTC
Resource URI: (The current URI for this page, for reference purposes)
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