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Spectroscopy of nova 2011-10d and photometry of nova candidate 2011-10e in M31

ATel #3725; E. Barsukova, S. Fabrika (Special Astrophysical Observatory, Russia), K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), T. Fatkhullin, O. Sholukhova (Special Astrophysical Observatory, Russia), W. Pietsch (MPE, Germany)
on 29 Oct 2011; 17:10 UT
Credential Certification: Barsukova E.A. (bars@sao.ru)

Subjects: Optical, Cataclysmic Variable, Nova, Variables

Referred to by ATel #: 3727, 3728, 4503, 5607, 5611, 5627

We have taken low resolution spectrum of the optical nova M31N 2011-10d (the first spectrum description is in ATel #3699) on 2011 October 26.94 UT. The spectrum was taken with the Russian 6-m BTA telescope equipped with the SCORPIO spectral camera. The spectral range was 405-585 nm, resolution 0.5 nm. We confirm the FeII-type of the nova. The spectrum shows blue continuum with very strong hydrogen and FeII emission lines with P Cyg profiles. The hydrogen and brightest FeII lines have heliocentric radial velocity of -240 +/-10 km/s. All the lines show two systems of absorption components, the high velocity one -3300 km/s and the low velocity one -1400 km/s in three hydrogen lines and -1100 km/s in the FeII lines. All the velocities were measured as center of gravity of the component profiles. Equivalent width of H_beta emission is 2.0 nm, its width (with taking into account the spectral resolution) FWHM = 680 km/s, HWZI = 2450 km/s.

The nova brightness estimates in R-band from images taken by K. Hornoch, P. Kusnirak with the 0.65-m telescope at Ondrejov observatory: Oct. 21.739 UT, 17.20 +/-0.07; 22.107, 16.78 +/-0.06; from images taken by K. Hornoch with the same telescope: 22.726, 17.30 +/-0.06; 23.109, 17.45 +/-0.08. The nova magnitudes during the spectroscopy were Oct. 26.932, V=17.79 +/-0.06; 26.960, B=18.29 +/-0.05.

We present brightness estimates of nova candidate M31N 2011-10e (= PNV J00452885+4154094), discovered 2011/10/22.460 by Stanislav Korotkiy and Leonid Elenin in M31 at R.A. = 00h45m28.85s, Decl. = +41d54m09.3s. The candidate brightness in R-band from images taken by K. Hornoch with the 0.65-m telescope at Ondrejov observatory: Oct. 23.121, 18.18 +/-0.08; from images taken with the 6-m BTA telescope: Oct. 26.969, V = 21.1 +/-0.16; 26.973, B = 20.9 +/-0.15. A finding chart of the M31N 2011-10e: http://jet.sao.ru/~bars/NOVA_M31/m31-2011-10e_B-band.jpg

Spectrum of M31N 20011-10d