Spectroscopic confirmation of MASTER OT J061642.05+435617.9 as a dwarf nova
ATel #13578; Keisuke Isogai (Kyoto Univerisity, Okayama Observatory)
on 21 Mar 2020; 23:44 UT
Credential Certification: Keisuke Isogai (isogai@kusastro.kyoto-u.ac.jp)
Subjects: Optical, Cataclysmic Variable, Transient, Variables
I report on a spectrum of the optical transient MASTER OT J061642.05+435617.9 obtained on 2020-3-20.63 UT by using a fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi
et al. 2019) mounted on the 3.8-m telescope Seimei at Okayama Observatory of Kyoto University.
This object was discovered by MASTER team on 2020-03-18.92777 UT (Atel #13567). Because the outburst amplitude seems larger than 8 mag, they indicated this object is a possible nova. The obtained spectrum (please see the below link) shows a blue continuum with H beta absorption, and there are no clear signals of other lines. These features suggest that this object is a dwarf nova. Because the outburst amplitude is large, this object can be a WZ Sge-type one. Follow-up time-resolved photometry would show us an early superhump phase.
Spectrum of MASTER OT J061642.05+435617.9
