Visible and infrared spectroscopy of the nova ASASSN-19mo
ATel #12809; Richard J. Rudy, John P. Subasavage
on 28 May 2019; 02:40 UT
Credential Certification: Richard Rudy (richard.j.rudy@aero.org)
Subjects: Infra-Red, Optical, Nova
Referred to by ATel #: 12817
Optical and IR spectra from 0.47-2.5 microns (resolution: 6-30 angstroms) of ASASSN-19mo (ATel #12795) were obtained 2019 May 25.43 and 27.36 (UT) with the Aerospace Corporation's 1.0 m telescope using its Visible and Near-Infrared Imaging Spectrograph (VNIRIS). Infrared as well as optical Fe II lines, plus the presence of numerous low excitation emission lines including C I, N I, O I, Na I, and Ca II, confirm the classification of this object as an Fe II nova. In the two days separating our observations, the P-Cygni profiles went from noticeable to undetectable. This was true for the C I and O I lines as well as the H I Balmer, Paschen, and Brackett series features. There is no indication of dust formation yet so the significant extinction noted by Aydi et al. (ATel #12795) is interstellar in origin. We observe a continuum that rises to the red to about 1.1 micron, suggesting a reddening of E(B-V) > 1.5 magnitudes.
