Spectroscopic identification of ASASSN-15qi as an FU Ori-like object
ATel #8147; Hiroyuki Maehara (Okayama Astrophysical Observatory, NAOJ), Kazuya Ayani (Bisei Astronomical Observatory), Ryosuke Itoh, Koji Takata, Koji S. Kawabata (Hiroshima University)
on 10 Oct 2015; 00:07 UT
Credential Certification: Hiroyuki Maehara (h.maehara@oao.nao.ac.jp)
Subjects: Optical, Transient, Variables, Young Stellar Object
We report spectroscopic observations of the optical transient
ASASSN-15qi. This object was discovered by the All-Sky Automated
Survey for Supernovae (ASAS-SN or "Assassin") at V=13.64 mag on
2015-10-03.27 and was classified as a possible YSO based on its
association with an HII region (ASAS-SN Transients list;
Shappee et al. 2014, ApJ, 788, 48).
The object is identical to IPHAS J225608.82+583104.1 (r=16.66,
i=15.59) and 2MASS J22560882+5831040 (J=13.704, H=12.923, K=12.647).
We obtained low resolution spectra of the object with the 1.01-m
telescope at Bisei Astronomical Observatory, Japan (Oct 8.53;
range: 400-800 nm; R=1300 at H-alpha) and the 1.5-m Kanata telescope
+ HOWPol at Higashi-Hiroshima Observatory, Japan (Oct 8.499;
450-900 nm; R=400). These spectra are dominated by H-alpha emission
line (E.W. = -4.0 nm). H-beta and Ca II IR triplet (849.8, 854.2,
and 866.2) lines are also in emission. Both H-alpha and H-beta
emission lines have "P Cyg" profiles. The absorption component of
H-alpha line is blue-shifted by about 500 km/s relative to the
emission peak. Fe II 492.4, 501.8, Mg I 516.7 and/or Fe II 516.9,
Na I D, and DIB 628.4 lines are seen in absorption. Fe II and Na I D
lines are blue-shifted by about 300 km/s with respect to the rest
wavelength. These features suggest that this object is likely an
FU Ori- or EX Lup-like object.