V392 Persei entering the post-nova eruption nebula phase

ATel #11872; M. J. Darnley (LJMU)
on 19 Jul 2018; 17:30 UT
Credential Certification: Matt Darnley (M.J.Darnley@ljmu.ac.uk)

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Here we report that the 2018 classical nova eruption from the known dwarf nova V392 Per has apparently entered the post-nova eruption nebular phase (see, ATel #11588, #11590, #11594, #11601, #11605, #11617, #11647, #11846 for further details; also see CBAT, ARAS, and Darnley & Starrfield 2018).

Unlike the our previous LT spectra (ATel #11601 and #11846), this spectrum was taken with the SPRAT instrument on the LT (R~350).

This new spectrum, as with the previous, show Balmer emission from Hα - Hδ and an array of He I lines. However, these lines have now been joined by extremely strong [O III] lines at 4363, 4959 and 5007 Å, and He II (4686 Å). The [O III] (5007) line rivals Hα in brightness; [O III] (4363) and He II (4686) are stronger than Hβ. The [O III] lines are double-peaked, whereas the H I, He I, and He II lines retain the triple peaked structure reported in ATel #11846, the width of the [O III] lines are consistent with those of H I.

The first Swift observations of this system are imminent, we strongly encourage follow-up observations, particularly high-resolution optical spectroscopy.