Bibcode
Kun, M.; Szegedi-Elek, E.; Moór, A.; Ábrahám, P.; Acosta-Pulido, J. A.; Apai, D.; Kelemen, J.; Pál, A.; Rácz, M.; Regály, Zs.; Szakáts, R.; Szalai, N.; Szing, A.
Bibliographical reference
The Astrophysical Journal Letters, Volume 733, Issue 1, article id. L8 (2011).
Advertised on:
5
2011
Citations
19
Refereed citations
17
Description
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 mag in the I C band) brightness
variations on 2-3 years timescales, flat spectral energy distribution
(SED), and extremely strong (300lsim EW/Å <~ 900) Hα
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.
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