2010CBET.2391....2H

Kamil Hornoch, Astronomical Institute, Ondrejov; Jose L. Prieto, Carnegiei Observatories; and Ondrej Pejcha, Department of Astronomy, Ohio State University, report low-resolution optical spectroscopy (range 370-930 nm, resolution 0.7 nm) and optical photometry of M31N 2010-06a, M31N 2010-06b, and M31N 2010-07a. Spectra were obtained by Prieto with the APO 3.5-m telescope (+ DIS) on July 18 UT. Magnitude measurements were obtained from co-added R-band images taken with the 0.65-m telescope (+ G2CCD-3200) at Ondrejov. The spectrograms are posted at the following website URL: http://users.obs.carnegiescience.edu/jose/novae_m31.pdf.

A spectrogram of M31N 2010-06a, taken by Prieto 21 days after its first optical detection by Hornoch, exhibits prominent emission lines of Balmer series, Fe II, and O I (777.4- and 844.6-nm), confirming the object as an "Fe II"-class nova. The FWHM of the H-alpha is 1600 km/s. The following additional R-band magnitudes were measured for M31N 2010-06a by Hornoch: June 29.022 UT, 17.4 ± 0.1 (P. Zasche); 29.034, 17.35 ± 0.1 (Zasche); 30.003, 17.05 ± 0.1 (Hornoch); 30.022, 16.9 ± 0.1 (Hornoch); July 1.022, 17.25 ± 0.1 (M. Wolf); 2.997, 17.25 ± 0.1 (Hornoch and Hornochova); 3.025, 17.1 ± 0.1 (Hornoch and Hornochova); 4.005, 17.2 ± 0.1 (Hornoch); 4.031, 17.1 ± 0.1 (Hornoch); 4.956, 17.1 ± 0.1 (Hornoch); 7.036, 18.0 ± 0.15 (Hornoch); 8.060, 17.8 ± 0.1 (Zasche); 9.011, 17.65 ± 0.1 (Hornoch and Wolf); 9.035, 17.6 ± 0.1 (Hornoch and Wolf); 14.050, 17.95 ± 0.1 (Hornoch, Wolf, and Hornochova); 15.010, 17.95 ± 0.1 (Hornoch and Wolf); 17.062, 18.05 ± 0.1 (Hornoch and Hornochova).

A spectrogram of M31N 2010-06b, taken by Prieto 21 days after its first optical detection by Hornoch, shows prominent emission lines of Balmer series, Fe II, and O I (777.4-nm and 844.6-nm) as well as emission of Ca II near-IR triplet confirming the object as an "Fe II"-class nova. The FWHM of the H-alpha is 760 km/s. The following additional R-band magnitudes were measured for M31N 2010-06b: June 29.022 UT, 18.9 ± 0.15 (Zasche); 30.003, 18.8 ± 0.1 (Hornoch); July 1.022, 18.55 ± 0.15 (Wolf); 2.997, 17.65 ± 0.1 (Hornoch and Hornochova); 4.005, 17.8 ± 0.1 (Hornoch); 4.956, 18.4 ± 0.15 (Hornoch); 7.036, 19.3 ± 0.2 (Hornoch); 8.060, 19.4 ± 0.15 (Zasche); 9.011, 19.4 ± 0.15 (Hornoch and Wolf); 14.050, 19.5 ± 0.25 (Hornoch, Wolf, and Hornochova); 15.010, 19.4 ± 0.15 (Hornoch and Wolf); 17.062, 19.2 ± 0.15 (Hornoch and Hornochova).

A spectrogram of M31N 2010-07a, taken by Prieto 11 days after its first optical detection by Hornoch, shows prominent emission lines of Balmer series, Fe II, O I (777.4-nm and 844.6-nm), and Ca II near-infrared emission triplet with strong P-Cygni absorption features. The FWHM of the H-alpha is 1000 km/s. This suggests that the object is young "Fe II"-class nova. The following additional R-band magnitudes were measured for M31N 2010-07a: July 9.011 UT, 17.45 ± 0.1 (Hornoch and Wolf); 9.035, 17.35 ± 0.1 (Hornoch and Wolf); 14.050, 17.75 ± 0.1 (Hornoch, Wolf, and Hornochova); 15.010, 17.55 ± 0.1 (Hornoch and Wolf); 17.062, 17.3 ± 0.1 (Hornoch and Hornochova).