Spectroscopic confirmation of high-amplitude eruptive YSOs and dipping giants from the VVV survey

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dc.contributor.authorGuo, Zhen
dc.contributor.authorLucas, P. W.
dc.contributor.authorKurtev, R.
dc.contributor.authorBorissova, J.
dc.contributor.authorPena, C. Contreras
dc.contributor.authorYurchenko, S. N.
dc.contributor.authorSmith, L. C.
dc.contributor.authorMinniti, D.
dc.contributor.authorSaito, R. K.
dc.contributor.authorBayo, A.
dc.contributor.authorCatelan, M.
dc.contributor.authorAlonso-Garcia, J.
dc.contributor.authorGaratti, A. Caratti o
dc.contributor.authorMorris, C.
dc.contributor.authorFroebrich, D.
dc.contributor.authorTennyson, J.
dc.contributor.authorMauco, K.
dc.contributor.authorAguayo, A.
dc.contributor.authorMiller, N.
dc.contributor.authorMuthu, H. D. S.
dc.date.accessioned2025-01-20T17:05:40Z
dc.date.available2025-01-20T17:05:40Z
dc.date.issued2024
dc.description.abstractDuring 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 Delta K-s > 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 (Delta K-s and Delta W2), 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.
dc.description.funderFONDECYT
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stad3700
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stad3700
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90740
dc.identifier.wosidWOS:001153798300013
dc.issue.numero2
dc.language.isoen
dc.pagina.final1788
dc.pagina.inicio1769
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectstars: AGB and post-AGB
dc.subjectstars: pre-main-sequence
dc.subjectstars: protostar
dc.subjectstars: variables: T Tauri, Herbig Ae/Be
dc.subjectinfrared: stars
dc.titleSpectroscopic confirmation of high-amplitude eruptive YSOs and dipping giants from the VVV survey
dc.typeartículo
dc.volumen528
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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