Optical observations of Nova V2362 Cyg
ATel #792; K. Czart, M. Lewandowski, G. Maciejewski, T. Tomov, M. Mikolajewski, A. Niedzielski (Torun Centre for Astronomy, Torun, Poland)
on 10 Apr 2006; 05:21 UT
Credential Certification: Andrzej Niedzielski (firstname.lastname@example.org)
Subjects: Optical, Cataclysmic Variable, Nova, Star
We report on optical spectral observations and V brightness estimate obtained with 60/90 cm Schmidt-Cassegrain telescope and the SAVS camera of the Nicolaus Copernicus University Observatory in Piwnice.
The spectrum obtained on April 6.05 UT (3400-7050AA, resolution of 4A) shows numerous absorption lines (HI, FeII, CaII
among the others) and in the range between H-delta and H9 resembles typical A5-A7 supergiant photosphere. The only emission seen in the spectrum is P-Cygni component of H-alpha (intensity of 1.2 relative to continuum, RV=-55 km/s with absorption component at RV=-680 km/s). The other hydrogen lines (H-beta to H12) appear in absorption only and have mean RV of -550 km/s. Similar RV show the absorptions of ionized metals such as FeII and CaII (-595 km/s).
On Apr. 7.05 UT an estimate of V=8.80 mag was obtained with the SAVS camera (Niedzielski et al.2003 AcA 53, 281).
In the spectra of April 7.10 UT (3750-4750AA and 5750-6750AA, resolution of 2 A) all HI lines from H-alpha to H8 are seen in emission and show weak absorption components. Also present are wide blends of NII 6168A + OI 6157A and probably 74rd multiplet of FeII (6148A, 6238A and 6456A) seen as emissions with weak absorption components. H-alpha emission is the strongest line (intensity of 2.5 relative to continuum, RV=-110 km/s, FWHM about 1850 km/s) and shows clearly presence of two absorption components: one at -770 km/s, and second at -1750 km/s. HeI 5876 is now present in absorption and has two components with RV of -800 and -1700 km/s.
The spectra of April 8.06 UT (4050-5050AA and 5720-6720AA, resolution 2A) are very similar to those of April 7.10. H-alpha emission component intensity is 3.2 times continuum, H-beta 2.5. The absorption components of H-alpha show RV of -800 and -1795 km/s (in H-beta the RV of absorption components is -882 and -1733 km/s respectively). The mean RV of the absorption components of other lines present in the spectrum is -880 and -1730 km/s. The NaI D1 and D2 interstellar lines are clearly resolved in the spectra with a mean equivalent with about 0.8 A corresponding to a distance of about 1.5 kpc (Allen 1973, Astrophysical Quantities).