Most of these novae are of the "Fe II" type in the classification system of Williams (1992). The only clear exceptions are M31 Nova 2006 #12, M33 Nova 2007 #01, M31N 2007-12b, M31N 2007-12d, M31N 2008-11a, and M33N 2009-01a, which are of the He/N type. Note the broad emission lines indicating a higher expansion velocities in these novae. (Nova M31 2007 10a and Nova M31 2007-11b are peculiar in that they have very narrow emission, but show He I lines.) M31N 2012-09a is likely a recurrent nova with previous eruptions being M31N 1984-07a and M31N 2004-11f (note the very broad emission line component clearly visible at H-alpha).
This material is based upon work supported by the National Science Foundation under Grant No. 0607682. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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