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Spectroscopic Classification of ASASSN-18dw as a Dwarf Nova

ATel #11366; J. R. Thorstensen (Dartmouth College)
on 27 Feb 2018; 18:09 UT
Credential Certification: Jose L. Prieto (jose.prietok@mail.udp.cl)

Subjects: Optical, Cataclysmic Variable, Transient

We obtained an optical spectrum (range 4200-7550 Angs., FWHM resolution = 3.5 Angs.) of ASASSN-18dw (ATel #11359, #11362) on UT 2018 Feb. 27.09 with ModSpec mounted on the MDM 2.4m telescope at KPNO. The spectrum shows a blue continuum with weak, broad H-alpha and H-beta absorption, with narrow emission cores, at z=0. The spectrum also shows the interstellar Na D doublet in absorption with EW=0.9 Angstroms. The spectrum of ASASSN-18dw is consistent with a dwarf nova in outburst.