NOVA CYGNI 2001 N°2 (V2275 CYGNI)
The discovery was made by Akihiko Tago, Okayama, Japan, on Aug. 18.599 and Aug. 18.603 UT (IAUC 7686).
Spectrum of Nova Cyg 2001 N°2 for the date Aug. 20.866 UT. Stacking of 34 two-minutes individual images. The calibration (bias, flat-field, wavelength calibration and response curve of instrument) was done using usual procedures in Iris and VisualSpec. The spectra is normalised to unity for the wavelength 6670 angstroms. R mag around 6.2. The P-Cygni profile of H-alpha is clearly visible.
Fast evolution of H-alpha line. The interval
of time between this two spectra is only 2 hours 45 minutes.
Long term evolution of the H-alpha emission. Expansion velocity measured for August 23.9 is about 3400 km/s (FWHM of H-alpha profile).
Equivalent width versus time for the H-alpha line.
Download spectra data (ASCII format):