2012CBET.3228....2D

M. Dennefeld, Institute d'Astrophysique de Paris and University of Paris 6; M. Valentini, University of Liege; A. Siviero and A. Pizzella, University of Padova; L. Tomasella, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova; and the NEON school (cf. IAUC 7664) students M. Cortes (Spain), N. Ozel (Belgium), and A. Rajpurohit (France), report that a spectrogram of PNV J23272715+0855391, obtained on Sept. 13.87 UT with the 1.82-m Copernico telescope (+ Afosc spectrograph; range 350-820 nm, resolution 1.3 nm), suggests that this is a dwarf nova. The spectrum shows a strong blue continuum, with Balmer lines in absorption, and a weak H_alpha emission inside the absorption. A weak He II (468.6 nm) emission line is possibly present. No other emission is seen and no P Cyg profiles detected. The Ca II doublet (393.3-396.7 nm) is also seen in absorption. The spectrum best resembles an object designated by Liu and Hu (2000, Ap.J. Supp. 128, 387) as "Cet1", also known as PG 0240+066 in the master catalogue of cataclysmic variables by Downes et al. (1997, PASP 109, 345).