2020AJ....160..278D -
Astron. J., 160, 278-278 (2020/December-0)
Periodic eruptive variability of the isolated pre-main-sequence star V347 Aurigae.
DAHM S.E. and HILLENBRAND L.A.
Abstract (from CDS):
V347 Aurigae is associated with the small dark cloud L1438 and appears to be an isolated pre-main-sequence star located at distance d ≃ 200 pc. Multi-epoch, archival photometry reveals periodic brightness variations with amplitude V ≃ 2.0 mag occurring on timescales of ∼160 days that have persisted for decades. Regular-cadence, optical imaging of the source with the Zwicky Transient Facility shows that a small reflection nebula illuminated by V347 Aur also fluctuates in brightness, at times fading completely. Multi-epoch, Keck/HIRES data suggests the presence of two distinct spectral components: a prominent emission-line-dominated spectrum with a heavily veiled continuum correlated with the bright photometric state, and an M-type absorption line spectrum associated with quiescence. All spectra exhibit strong Balmer and He I line emission, consistent with accretion, as well as high velocity emission arising from the forbidden transitions of [O I], [N II], and [S II] that are generally associated with collimated jets and disk winds. There is no evidence in existing high-dispersion spectroscopy or high-resolution imaging for binarity of V347 Aur. The repeating outburst events are possibly linked to accretion instabilities induced by an undetected companion or a structure within the circumstellar disk that periodically increases the mass accretion rate. V347 Aur is perhaps analogous to an EXor-type variable, though more regularly recurring.
Abstract Copyright:
© 2020. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Pre-main sequence stars - Circumstellar disks - T Tauri stars - Young stellar objects - Accretion - Stellar accretion disks
Status at CDS
:
Examining the need for a new acronym.
Simbad objects:
31
Full paper
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