Spectroscopic classification of ASASSN-19oa as a dwarf nova
ATel #12842; E. Aydi (MSU), T. W.-S. Holoien, K. Decker French (Carnegie), L. Chomiuk, A. Kawash, K. Sokolovsky, J. Strader (MSU), K. Z. Stanek, C. S. Kochanek, J. Shields, C. M. Basinger, P. Vallely (OSU), B. J. Shappee (Univ. of Hawaii)
on 5 Jun 2019; 17:58 UT
Credential Certification: Elias Aydi (eaydi@saao.ac.za)
Subjects: Optical, Binary, Cataclysmic Variable, Star, Transient
Referred to by ATel #: 12853
The optical transient ASASSN-19oa,
was discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN: Shappee et al. 2014; Kochanek et al. 2017) on 2019-06-3.17 UT. We obtained a low-resolution spectrum of ASASSN-19oa on 2019-06-3.96 UT using the Du Pont 2.5-m telescope at Las Campanas Observatory. The observation was of 2x600 s exposure and covers the wavelength range of 3800-9500 A. The spectrum shows a blue continuum with Balmer absorption lines and weak Halpha in emission. We also detect weak He I emission lines at 4438 and 7065 A. The overall spectrum is characteristic of a dwarf nova outburst.
