Guo, Zhen, Lucas, P. W., Kurtev, R., Borissova, J., Contreras Peña, C., Yurchenko, S. N., Smith, L. C., Minniti, D., Saito, R. K., Bayo, A., and others. (2024) Spectroscopic confirmation of high-amplitude eruptive YSOs and dipping giants from the VVV survey. Monthly Notices of the Royal Astronomical Society, 528 (2). pp. 1769-1788. ISSN 0035-8711. E-ISSN 1365-2966. (doi:10.1093/mnras/stad3700) (KAR id:104789)
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Language: English 
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| Official URL: https://doi.org/10.1093/mnras/stad3700 |
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Abstract
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 Ks > 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 ( Ks and 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
| Item Type: | Article |
|---|---|
| DOI/Identification number: | 10.1093/mnras/stad3700 |
| Additional information: | For the purpose of open access, the author(s) has applied a Creative Commons Attribution (CC BY) licence to any Author Accepted Manuscript version arising |
| Uncontrolled keywords: | stars: AGB and post-AGB; stars: pre-main-sequence; stars: protostar; stars: variables: T Tauri, Herbig Ae/Be; infrared: stars |
| Subjects: | Q Science > QB Astronomy > QB460 Astrophysics |
| Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
| Funders: | Science and Technology Facilities Council (https://ror.org/057g20z61) |
| Depositing User: | Dirk Froebrich |
| Date Deposited: | 29 Jan 2024 10:51 UTC |
| Last Modified: | 05 Nov 2024 13:10 UTC |
| Resource URI: | https://kar.kent.ac.uk/id/eprint/104789 (The current URI for this page, for reference purposes) |
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