A peculiar young eruptive star in the dark cloud Lynds 1340

Abstract

We conducted a long-term optical photometric and spectroscopic monitoring of the strongly variable, accreting young sun-like star [KOS94] HA11, associated with the dark cloud Lynds 1340, that exhibited large amplitude (5-6 magnitudes in the I_C band) brightness variations on 2-3 years timescales, flat spectral energy distribution (SED), and extremely strong (300 < EW/Angstrom < 900) H alpha emission. In this Letter we describe the basic properties of the star, derived from our observations between 1999 and 2011, and put into context the observed phenomena. The observed variations in the emission spectra, near-infrared colors, and SED suggest that [KOS94] HA11 (spectral type: K7--M0) is an eruptive young star, possibly similar in nature to V1647 Ori: its large-scale photometric variations are governed by variable accretion rate, associated with variations in the inner disk structure. The star recently has undergone strong and rapid brightness variations, thus its further observations may offer a rare opportunity for studying structural and chemical rearrangements of the inner disk, induced by variable central luminosity.

15 pages, 4 figures, 1 table; accepted by ApJL

References in corpus (6)

• The outburst and nature of two young eruptive stars in the North America/Pelican Nebula Complex
• The 2008 extreme outburst of the young eruptive variable star Ex Lupi
• V1647 Orionis: One Year into Quiescence
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• The intermediate-mass star-forming region Lynds 1340. An optical view
• WISE photometry of EXor sources and candidates
• A long-lasting quiescence phase of the eruptive variable V1118 Ori
• The young stellar population of Lynds 1340. An infrared view
• New Candidate Eruptive Young Stars in Lynds 1340
• First X-ray dectection of the young variable V1180 Cas
• Protostellar Outflows in L1340
• Long-term Photometric Study of the Pre-main Sequence Star V1180 Cas