2010CBET.2283....1T

G. Tovmassian, D. Clark, and S. Zharikov, Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, conducted 2.5 hours of spectrophotometry of the object announced on CBET 2273 (see also CBETs 2275 and 2277) – starting on May 10.4 UT, with the 2.1-m telescope (+ Boller & Chivens spectrograph; 1200 lines/mm grating; resolution FWHM 0.13 nm, range 370-500 nm). The spectra show broad absorption lines of H and He, with small central emission in the cores of the lines, typical of the spectra of dwarf novae at the plateau of outburst. The central emission peak increases in strength towards H_beta of the Balmer series but is strongest in the He II line. The Bowen complex of N III, C III, and C IV is also visible in emission. Measurements of radial velocities of the lines confirm the binary nature of the object. The period determination is very rough at 82 ± 5 minutes, based on only 25 spectra obtained with 60-s exposure times and covering continuously about one full orbital period. The deduced period confirms the dwarf-nova nature of the object and argues strongly in favor of a WZ Sge classification – as such objects are known to undergo super-outbursts with amplitude of approximately 8 magnitudes.