2007CBET.1035....1S

P. Skoda, J. Kubat, V. Votruba, M. Slechta, Z. Podskalsky, and M. Kartak, Astronomical Institute, Ondrejov, Czech Republic, report spectra of N Vul 2007 were obtained with the Ondrejov 2-m telescope. A coude spectrum (resolving power 13000, 0.025 nm/pixel, range 625-675 nm) on Aug. 15.003 UT shows a broad-emission (FWHM = 2600 km/s) H_alpha profile (relative emission strength 6.9 times that of the continuum) with a central absorption at +500 km/s and shallow P-Cyg absorption at the blue edge of H_alpha. The He I 667.8-nm line has two peaks (relative emission strengths 1.7 and 2.0 times that of the continuum) with maxima placed at -1490 and +1430 km/s (± 50 km/s), respectively. On the similar spectrum from Aug. 15.99, this 3300-km/s-wide line has an almost-flat top, and the small absorption on the left side of the H_alpha profile has disappeared. The high-resolution spectrum obtained with the Ondrejov echelle spectrograph (resolving power about 40000, 0.008 nm/pixel, range 450-800 nm) on Aug. 15.10 confirms the emission nature of He I lines 492.2-, 501.5-, 504.8-, 587.6-, 667.8-, and 706.5-nm with peak maximum placed at 1450 km/s (± 80 km/s).