2010CBET.2319....1H

Kamil Hornoch, Astronomical Institute, Ondrejov; Rubab Khan, Jonathan Bird, and Ondrej Pejcha, Department of Astronomy, Ohio State University; Peter Garnavich, Colin Littlefield, and Nancy Paul, University of Notre Dame; and Samia Bouzid, Rutgers University, report low-resolution optical spectroscopy (range 450-670 nm, resolution R = 1600) and optical photometry of M31N 2010-05a (cf. CBET 2305). Spectra were obtained using the OSMOS spectrograph and the VPH grism on the 2.4-m Hiltner telescope at MDM Observatory. Magnitude measurements were obtained from co-added R-band images taken with the OSMOS spectrograph and imager on the 2.4-m Hiltner telescope, with the Vatt4k imager on the 1.83-m Vatican Advanced Technology Telescope, and with the 0.65-m telescope (+ G2CCD-3200) at Ondrejov. A spectrogram taken by Bird on June 5.47 UT (8.43 days after its first optical detection by Hornoch et al.) exhibits H-alpha, H-beta, and Fe II emission lines. The HWZI of H-alpha and H-beta is about 2000 km/s. They did not see any trace of an He II 468.6-nm line. This suggests that the object is an "Fe II"-class nova. The following additional R-band magnitudes were obtained for M31N 2010-05a: June 5.024, 17.2 ± 0.1 (Hornoch and P. Hornochova, 0.65-m telescope); 5.468, 17.1 ± 0.1 (Bird, 2.4-m telescope); 6.038, 17.2 ± 0.1 (Hornoch and Hornochova); 6.473, 17.1 ± 0.1 (Bird); 7.464, 17.2 ± 0.1 (Bird); 8.044, 17.4 ± 0.25 (Hornoch and Hornochova); 9.036, 17.35 ± 0.1 (Hornoch); 9.459, 17.18 ± 0.03 (Garnavich, Littlefield, Paul, and Bouzid, 1.83-m telescope). The 1.83-m telescope image also shows M31N 2010-03a (cf. CBETs 2192, 2212) at R = 20.1 ± 0.2. The novae M31N 2010-02a (cf. CBETs 2190, 2192, 2212), 2010-03b (cf. CBET 2212), and 2010-04a (cf. CBET 2267) are not present on the same image down to R magnitudes 20.7, 20.6, and 20.5, respectively.