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Spectroscopy and photometry of novae M31N 2013-10d and M31N 2013-10g

ATel #5543; S. Fabrika, E. A. Barsukova, A. F. Valeev, O. Sholukhova (Special Astrophysical Observatory, Nizhnij Arkhyz), M. Henze (ESA/ESAC, Spain), A. W. Shafter (SDSU), K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic)
on 4 Nov 2013; 19:55 UT
Credential Certification: Sergei Fabrika (fabrika@sao.ru)

Subjects: Optical, Binary, Nova, Transient

Referred to by ATel #: 5569

We report optical spectroscopy and photometry of the recent M31 nova candidates 2013-10d (= CSS131014:004421+405522 = PNV J00442132+4055220; ATel #5475) and 2013-10g (= iPTF13dum = PNV J00432496+4121219; ATels #5502, #5522). The spectra were taken on 2013 Nov. 1.72 UT (2013-10d) and 2013 Nov. 1.69 UT (2013-10g) using the Russian BTA telescope equipped with the SCORPIO spectrograph. Spectra were taken with spectral resolution of 5 Å in spectral range 4050 - 5850 Å. The nova M31N 2013-10d belongs to He/N class. The spectrum shows very strong and broad hydrogen emission lines, NII, NIII, HeI and HeII. The Hβ line in not symmetrical, and it is notably stronger in its red part. The line's width is FWHM = 1600 km/s, its equivalent width is EW ~ 660 Å. For the second nova M31N 2013-10g we have a photometry taken before spectroscopy B = 18.22 ± 0.07, V = 17.80 ± 0.02, Rc = 17.45 ± 0.01. This nova belongs to the Fe II class. The spectrum shows strong hydrogen lines and a forest of Fe II emission lines. The hydrogen lines and some of the Fe II lines have P Cyg type profiles with narrow absorption components. An expansion velocity measured as separation between a bottom of absorption and emission peak in these lines is 1300 km/s. The Hβ line has FWHM = 1500 km/s and EW = 48 Å.

Spectrum of the novae