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Confirmation of two recent optical nova candidates in M 31

ATEL # 2165; M. Henze, F. Kaduk, V. Burwitz, W. Pietsch (Max-Planck-Institut fuer extraterrestrische Physik, MPE), G. Papamastorakis, P. Reig (FORTH & Dept. of Physics, University of Crete), A. Strigachev (Inst. of Astronomy, Bulgarian Academy of Sciences)
on 18 Aug 2009; 21:34 UT
Distributed as an Instant Email Notice (Nova)
Password Certification: Vadim Burwitz (

Subjects: Optical, Nova

We report the confirmation of two nova candidates in M31 recently reported to us by K. Hornoch (see also D. Bishop's website at The objects were detected on three and two consecutive dithered stacked CCD images, obtained on 2009 Aug 13.05 and 13.08, respectively, with the 1.3m Ritchey Chretien f/7.5 telescope at Skinakas Observatory, Crete, Greece, using an Andor DZ436-BV CCD Camera (with a Marconi 2k x 2k chip with 13.5 microns sq. pixels) and a broad (75 Angstrom wide) H-alpha filter. Both objects are clearly visible on the individual images. The positions obtained for the nova candidates are RA = 00h42m41.22s, Dec = 41d17'01.3" and RA = 00h42m46.76, Dec = 41d15'37.3" (J2000, accuracy of 0.3"), which are 35" west, 52" north and 28" east, 32" south of the core of M 31, respectively. We determined magnitudes of 17.3 and 16.6, respectively, from a photometric solution using R magnitudes (see also ATel #1602) of the Local Group Survey M 31 catalogue (Massey et al. 2006, AJ, 131, 2478). The limiting magnitude at both candidate positions is 18.0. No objects are visible at the candidate positions on H-alpha images obtained with the same Telescope and camera on 2009 August 04.04 and 04.07 (limiting magnitude at both candidate positions 18.5).

Furthermore, we report H-alpha photometry using the Skinakas camera as above, of nova M31N 2008-07a (2009 Aug 13.05; 17.9, compare ATels #1609, #1773, #2147), and the nova candidates M31N 2009-02b (2009 Aug 13.06; 18.4, compare ATel #1935, #2147), M31N 2009-05a (2009 Aug 13.08; 16.5), and M31N 2009-05b (2009 Aug 13.06; 18.0), as well as the new candidate reported in ATel #2147 (2009 Aug 13.03; 17.2)

All magnitudes given are obtained from a photometric solution using R magnitudes of the Local Group Survey M 31 catalogue (see above). There is no entry in VizieR/CDS for the new objects and no minor planet could be found on the positions using the MPC/IAU Minor Planet Checker (see ).

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