TY - JOUR
T1 - Spectroscopic confirmation of high-amplitude eruptive YSOs and dipping giants from the VVV survey
AU - Guo, Zhen
AU - Lucas, P. W.
AU - Kurtev, R.
AU - Borissova, J.
AU - Peña, C. Contreras
AU - Yurchenko, S. N.
AU - Smith, L. C.
AU - Minniti, D.
AU - Saito, R. K.
AU - Bayo, A.
AU - Catelan, M.
AU - Alonso-García, Javier
AU - Garatti, A. Caratti o
AU - Morris, C.
AU - Froebrich, D.
AU - Tennyson, J.
AU - Maucó, K.
AU - Aguayo, A.
AU - Miller, N.
AU - Muthu, H. D. S.
N1 - © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/
PY - 2024/2/1
Y1 - 2024/2/1
N2 - 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 multidecade FUor-type outbursts. Here, we present a near-infrared spectroscopic follow-up study of 33 high-amplitude (most with ΔKs > 4 mag) variable sources discovered by the Vista Variables in the Via Lactea (VVV) survey. Based on the spectral features, 25 sources are classified as eruptive young stellar objects (YSOs), including 15 newly identified FUors, six with long-lasting, but EXor-like bursts of magnetospheric accretion and four displaying outflow-dominated spectra. By examining the photometric behaviours of eruptive YSOs, we found most FUor-type outbursts have higher amplitudes (ΔKs and ΔW2), faster eruptive time-scales and bluer infrared colours than the other outburst types. In addition, we identified seven post-MS variables apparently associated with deep dipping events and an eruptive star with deep aluminium monoxide absorption bands resembling those seen in the V838 Mon stellar merger.
AB - 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 multidecade FUor-type outbursts. Here, we present a near-infrared spectroscopic follow-up study of 33 high-amplitude (most with ΔKs > 4 mag) variable sources discovered by the Vista Variables in the Via Lactea (VVV) survey. Based on the spectral features, 25 sources are classified as eruptive young stellar objects (YSOs), including 15 newly identified FUors, six with long-lasting, but EXor-like bursts of magnetospheric accretion and four displaying outflow-dominated spectra. By examining the photometric behaviours of eruptive YSOs, we found most FUor-type outbursts have higher amplitudes (ΔKs and ΔW2), faster eruptive time-scales and bluer infrared colours than the other outburst types. In addition, we identified seven post-MS variables apparently associated with deep dipping events and an eruptive star with deep aluminium monoxide absorption bands resembling those seen in the V838 Mon stellar merger.
KW - astro-ph.SR
KW - infrared: stars
KW - stars: AGB and post-AGB
KW - stars: pre-main-sequence
KW - stars: variables: T Tauri, Herbig Ae/Be
KW - stars: protostar
UR - http://www.scopus.com/inward/record.url?scp=85184209310&partnerID=8YFLogxK
U2 - 10.1093/mnras/stad3700
DO - 10.1093/mnras/stad3700
M3 - Article
SN - 1365-2966
VL - 528
SP - 1769
EP - 1788
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
M1 - stad3700
ER -