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Spectroscopy of nova 2009-08a in M31 in rebrightening

ATel #2208; A. Valeev, E. Barsukova, O. Sholukhova (Special Astrophysical Observatory, Russia), A. Medvedev (Sternberg Institute, Moscow), K. Hornoch, P. Kusnirak (Astronomical Institute, Ondrejov, Czech Republic), W. Pietsch (MPE, Germany), S. Fabrika (Special Astrophysical Observatory, Russia)
on 22 Sep 2009; 23:46 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Barsukova E.A. (bars@sao.ru)

Subjects: Optical, Cataclysmic Variable, Nova

We obtained low resolution spectra of the optical nova candidate N2009-08a in M31 (RA=00 42 58.06, Dec=+41 17 29.8, J2000). It was discovered by W. Pietsch et al. on 2009 Aug 4.03 with 17.6 R(ATEL#2147). The spectrum has been taken on Sept. 18.03.

The nova has shown rebrightening, the brightness evolution in R-band from images taken by using the 0.65-m telescope at Ondrejov: Aug. 29.941, 18.3; 30.866, 18.3; 31.884, 18.0; Sept. 1.978, 17.8; 5.913, 17.8; 6.893, 18.4; 8.857, 18.5; 9.767, 18.2; 19.951, 18.3 with an uncertainty of 0.1 - 0.15 mag. The nova magnitude during our spectroscopy (V-band, Sept. 18.025) was 18.39 +/-0.04.

The spectra have been taken with the Russian 6-m telescope (BTA) equipped with the SCORPIO spectral camera. The spectral range was 374-783 nm, resolution 1.27 nm. The spectrum of N2009-08a is of the FeII-type. The spectrum is very similar to that of N2008-10b (ATEL#1871), which showed a rebrightening effect as well. Emissions of hydrogen, non-blended FeII lines and NaI D1,2 lines have P Cyg line profiles. Equivalent widths of H-alpha and H-beta emissions are 47 and 11 nm, their widths corrected for spectral resolution are 1330 and 1230 km/s, their emission component heliocentric radial velocities are -300 and -400 km/s respectively. Absorption components in the P Cyg line profiles of H-alpha, H-beta and three strongest FeII lines (492.39, 501.84 and 516.90 nm show the same velocities, -2000 km/s in the absorption peak, -2550 km/s in the absorption blue edge and -1550 km/s in the steep transition between emission and absorption components.

Spectrum of M31N 2009-08a