Spectroscopy of the Nova Sagitarii 2012 (PNV J17452791-2305213)
ATel #4094; V. F. Esipov (SAI MSU), K. V. Sokolovsky (ASC Lebedev/SAI MSU), and S. A. Korotkiy (Ka-Dar Obs.)
on 5 May 2012; 07:36 UT
Credential Certification: Kirill Sokolovsky (kirx@scan.sai.msu.ru)
Nova Sagitarii 2012 (CBET #3089; ATel #4061, #4088, #4093) was
observed spectroscopically with the 1.25m ZTE telescope of the
Crimean Laboratory, Moscow State University. Three intermediate
resolution spectra (R=2000) covering the range 4000-9000A were
obtained on April 24.04, 26.01, and 27.03 UT (3, 5 and 6 days after
the explosion). All spectra are dominated by broad H_alpha, H_beta
and OI emission corresponding to expansion velocities up to 6500km/s.
The estimated expansion velocities are slightly larger than those
reported on April 23 and 25 by C. Buil and K. Imamura (CBET #3089).
The presence of H_gamma and HeII 4686 lines is evident in the
April 26 spectrum.
Detection of HeII emission together with the flat-top shape of
emission lines, high expansion velocity and rapid lightcurve
evolution allows one to classify the object as a fast He/N type
nova (Williams 1992, AJ, 104, 725).
