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Spectroscopic confirmation of PNV J00431504+4120506 as a classical nova

ATel #10596; E. A. Barsukova, A. F. Valeev (Special Astrophysical Observatory, Russia), V. P. Goranskij (SAI, Moscow University), M. Henze (IEEC/CSIC), A. W. Shafter (SDSU), K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic)
on 25 Jul 2017; 11:16 UT
Credential Certification: Barsukova E.A. (bars@sao.ru)

Subjects: Optical, Nova

We report optical spectroscopy of the M31 nova candidate PNV J00431504+4120506 (AT2017fog, ATel #10588). The data were obtained on 2017 July 22.013 UT using the Russian BTA telescope equipped with the SCORPIO spectrograph. The total exposure was 1.5 ks. The spectra were taken with a spectral resolution of 4.7 Å in the spectral range of 4046 - 5841 Å and with the signal to noise ratio of 40. Photometry of the object was obtained before and immediately after the spectroscopy. The values of B = 16.70 ± 0.05, V = 16.57 ± 0.05, Rc = 16.46 ± 0.05. The spectrum has a blue continuum of a hot star. Hβ and Hγ lines have P Cyg profiles along with the following Fe II lines: 4128, 4179, 4233, 4303, 4924, 5018, 5169, 5198, 5235, 5276, 5317 Å. The heliocentric radial velocity of emission components of the P Cyg profiles equals to -200 km/s. The absorption minima are shifted from these emission maxima by 650 km/s to the blue side, while absorptions spread of 1000 km/s. We classified this nova as a Fe II class nova, in the system of Williams (1992), at maximum brightness.

The spectrum of the Nova