Spectroscopic Classification of TCP J18433189+1011051 as a Dwarf Nova Outburst
ATel #16304; Kenta Taguchi, Miho Kawabata (Kyoto University), Jingyuan Zhao, Xing Gao (Xingming Observatory)
on 23 Oct 2023; 04:32 UT
Credential Certification: Keisuke Isogai (isogai@kusastro.kyoto-u.ac.jp)
Subjects: Optical, Cataclysmic Variable, Transient, Variables
We report the spectroscopic classification of TCP J18433189+1011051.
We obtained its spectra by the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8 m Seimei telescope (Kurita et al. 2020) at Okayama Observatory of Kyoto University on 2023-10-20.50 UT using the VPH-blue grism (covering 4100 - 8500 Å, resolution ∼ 500), and by using a Alpy 600 spectrograph mounted on the 0.6-m f/8 Ritchey-Chretien telescope at Xingming Observatory on 2023-10-21.56338 UT.
As reported to CBAT, this object was discovered at 14.0 mag (unfiltered) on 2023-10-19.4788 UT by Yuji Nakamura.
The spectrum by Seimei/KOOLS-IFU is dominated by a blue continuum, with a weak emission line of Hα and an absorption line of Hβ.
Consistently with it, the spectrum by Xingming Observatory shows a blue continuum with a weak Hα emission line and Hβ, Hγ, Hδ, Hε, and other absorption lines.
Considering the spectral features and the ZTF light curve, we conclude this object is a dwarf nova.
Spectrum by Seimei/KOOLS-IFU
