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On the incidence of episodic accretion in Class I YSOs from VVV
Carlos Contreras Peña, Philip W. Lucas, Zhen Guo +1
Episodic accretion is one of the competing models to explain the observed luminosity spread in young stellar clusters. These short-lived high accretion events could also have a str…
The most variable VVV sources: eruptive protostars, dipping giants in the Nuclear Disc and others
P. W. Lucas, L. C. Smith, Z. Guo +16
We have performed a comprehensive search of a VISTA Variables in the Via Lactea (VVV) database of 9.5 yr light curves for variable sources with mag, aiming to provide…
Spectroscopic confirmation of high-amplitude eruptive YSOs and dipping giants from the VVV survey
Zhen Guo, P. W. Lucas, R. Kurtev +17
During the pre-main-sequence (pre-MS) evolution stage of a star, significant amounts of stellar mass are accreted during episodic accretion events, such as multi-decade FUor-type o…
The 2022-2023 accretion outburst of the young star V1741 Sgr
Michael A. Kuhn, Lynne A. Hillenbrand, Michael S. Connelley +12
V1741 Sgr (= SPICY 71482/Gaia22dtk) is a Classical T Tauri star on the outskirts of the Lagoon Nebula. After at least a decade of stability, in mid-2022, the optical source brighte…
High energy gamma-ray sources in the VVV survey -- II. The AGN counterparts
Laura G. Donoso, Ana Pichel, Laura D. Baravalle +9
We identified Active Galactic Nuclei (AGN) candidates as counterparts to unidentified gamma-ray sources (UGS) from the Fermi-LAT Fourth Source Catalogue at lower Galactic latitudes…