Burwitz, V.; Henze, M.; Pietsch, W.; Holmes, S.; Kolb, U.; Haswell, C. A. and Rodriguez, J.
H-alpha confirmation of two recent disc novae in M 31.
The Astronomer's Telegram, 3499 p. 1.
We obtained a set of 11x180s, 11x120s, and 11x60s dithered stacked CCD images of M 31, respectively, using Baader broad (7nm wide) H-alpha, Baader R and Baader clear (Cl) filters on 2011 July 5 with the Open University PIRATE Planewave CDK17 0.43m Dall-Kirkham f/6.7 telescope at the Observatorio Astronomico de Mallorca, Costitx, Spain, using an SBIG STX 16803 CCD Camera (with a Marconi 4k x 4k chip with 9 microns sq. pixels).
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