0.38-2.5 micron spectroscopy of the recurrent nova V3890 Sagittarii

ATel #13059; Richard Rudy, John Subasavage, Kirk Crawford, David Gutierrez, Ray Russell, Sloane Wiktorowicz (The Aerospace Corporation)
on 31 Aug 2019; 01:45 UT
Credential Certification: Richard Rudy (richard.j.rudy@aero.org)

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Optical and IR spectra from 0.38-2.5 microns (resolution: 6-30 angstroms) of the recurrent nova V3890 Sagittarii were obtained 2019 August 30.18 (UT) with the Aerospace Corporation's 1.0 m telescope using its Visible and Near-Infrared Imaging Spectrograph (VNIRIS). Our observations show changes from the spectrum of Strader et. al. (#ATel 13047) from 2 days previous. The broad absorption on the wing of H-alpha is no longer apparent and the spectrum displays weak Fe II emission and strong O I lines. The lines remain very broad with full width zero intensities reaching 10,000 km/sec. The reddening derived from the O I lines at 0.8446, 1.1287, and 1.3165 microns is E(B-V) = 0.5 +- 0.2. The nova is very bright. We derive infrared magnitudes from our spectroscopy for J, H, and K of 6.6, 6.4, and 6.0, respectively, and a V magnitude of 8.9.