Infrared spectroscopy of eruptive variable protostars from VVV

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dc.contributor.authorContreras Peña, C.
dc.contributor.authorLucas, P.W.
dc.contributor.authorKurtev, R.
dc.contributor.authorMinniti, D.
dc.contributor.authorCaratti o Garatti, A.
dc.contributor.authorMarocco, F.
dc.contributor.authorThompson, M.A.
dc.contributor.authorFroebrich, D.
dc.contributor.authorKumar, M.
dc.contributor.authorStimson, W.
dc.contributor.authorNavarro Molina, C.
dc.contributor.authorBorissova, J.
dc.contributor.authorGledhill, T.
dc.contributor.authorTerzi, R.
dc.date.accessioned2017-09-14T18:39:23Z
dc.date.available2017-09-14T18:39:23Z
dc.date.issued2017-03
dc.descriptionIndexación: Web of Science; Scopus.es_CL
dc.description.abstractIn a companion work (Paper I), we detected a large population of highly variable Young Stellar Objects (YSOs) in the Vista Variables in the Via Lactea (VVV) survey, typically with class I or flat spectrum spectral energy distributions and diverse light-curve types. Here we present infrared spectra (0.9-2.5 mu m) of 37 of these variables, many of them observed in a bright state. The spectra confirm that 15/18 sources with eruptive light curves have signatures of a high accretion rate, either showing EXor-like emission features (Delta v = 2 CO, Br gamma.) and/or FUor-like features (Delta v = 2 CO and H2O strongly in absorption). Similar features were seen in some long-term periodic YSOs and faders but not in dippers or short-term variables. The sample includes some dusty Mira variables (typically distinguished by smooth Mira-like light curves), two cataclysmic variables and a carbon star. In total, we have added 19 new objects to the broad class of eruptive variable YSOs with episodic accretion. Eruptive variable YSOs in our sample that were observed at bright states show higher accretion luminosities than the rest of the sample. Most of the eruptive variables differ from the established FUor and EXor subclasses, showing intermediate outburst durations and a mixture of their spectroscopic characteristics. This is in line with a small number of other recent discoveries. Since these previously atypical objects are now the majority amongst embedded members of the class, we propose a new classification for them as MNors. This term (pronounced emnor) follows V1647 Ori, the illuminating star of McNeil's Nebula.es_CL
dc.description.urihttps://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2802
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Volume 465, Issue 3, 1 March 2017es_CL
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.otherhttps://doi.org/10.1093/mnras/stw2802
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/4242
dc.language.isoenes_CL
dc.publisherOXFORD UNIV PRESSes_CL
dc.subjectStars: AGB and post-AGBes_CL
dc.subjectStars: low-masses_CL
dc.subjectStars: pre-main-sequencees_CL
dc.subjectStars: protostarses_CL
dc.subjectStars: variables: T Tauri, Herbig Ae/Bees_CL
dc.subjectInfrared: starses_CL
dc.titleInfrared spectroscopy of eruptive variable protostars from VVVes_CL
dc.typeArtículoes_CL
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