Spectral evolution of M31N 2009-10b
ATel #2251; E. Barsukova, V. Afanasiev, S. Fabrika, A. Valeev (Special Astrophysical Observatory, Russia), K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), W. Pietsch (MPE, Germany)
on 22 Oct 2009; 12:41 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Barsukova E.A. (bars@sao.ru)
We obtained spectra of the nova N2009-10b in M31 (RA=00 42 20.81, Dec=+41 16 44.2). It was discovered by Koichi Itagaki on Oct. 10.629, http://www.cfa.harvard.edu/iau/CBAT_M31.html#2009-10b.
The spectrum has been taken with the SCORPIO spectral camera on Oct. 19.936 in a spectral range 382-838 nm with resolution 1.3 nm. We confirm the FeII type of the nova suspected in ATEL#2248, however the spectrum changed. We observe very strong and asymmetric HI emissions with extended red wings and many strong FeII lines without P Cyg absorption components. NaI D1,2 and OI (777.3 nm) show P Cyg-type line profiles with their absorption peak at -1300 km/s. Equivalent widths of H-alpha and H-beta emissions are 19 and 9 nm, their widths corrected for the spectral resolution are FWHM = 1500 and 1800 km/s. A full width at zero intensity in H-alpha line is about of 6000 km/s. Heliocentric radial velocities of H-alpha, H-beta and H-gamma line peaks are -300, -120, -80 km/s respectively. The radial velocities of FeII, CaII K and NaI D1,2 lines are â80 km/s.
The nova brightness has been estimated in the same observations: Oct. 19.957 UT 16.98 +/-0.04 (B-band); 19.958, 16.46 +/-0.03(V-band); 19.960, 15.76 +/-0.04 (R-band).
Link to the spectrum of nova M31N 2009-10b
