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[PNV J00422171+4112338] : PN in M31

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We performed optical low-dispersion spectroscopic observations of the possible nova in M31 ( PNV J00422171+4112338 ) on 2011 September 14.643UT using the 1.3m Araki telescope(+LOSA/F2). The total exposure time is 3600 sec.  The figure shows our spectrum of the object. The spectrum exhibits quite broad H-alpha and H-beta emission features. No other significant features are identified in our spectrum.  The FWHM of the H-alpha emission is about 4600 km/s ! This suggests that the object would be a very fast nova and a candidate of recurrent nova.  Such high expansion velocities are often observed in U Sco-type recurrent novae. The photometric observations are needed.

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