[IAUC] CBET 2136: 20100120 : M31N 2010-01a

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                                                  Electronic Telegram No. 2136
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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M31N 2010-01a
     Further to CBET 2127, K. Hornoch, Astronomical Institute, Ondrejov; J.
Prieto, Carnegie Observatories; and R. Khan and O. Pejcha, Department of
Astronomy, Ohio State University, report additional low-resolution optical
spectroscopy (range 400-750 nm, resolution 1.4 nm) and optical photometry of
M31N 2010-01a.  Spectra were obtained using the Boller & Chivens CCD
Spectrograph on the 2.4-m Hiltner telescope at MDM Observatory; a spectrogram
of M31N 2010-01a, taken by Prieto and Khan on 2010 Jan. 15.09 UT (3.96 days
after its first optical detection made by V. Burwitz et al.) shows evolution
with respect to their previous observation --- namely, the P-Cyg profiles
disappeared and the spectrum is dominated by strong emission lines of the
Balmer series up to at least H-epsilon, and emission lines of iron.  The
object is thus confirmed as an "Fe II"-class nova in its early decline
phase.  The HWZI of H-alpha and H-beta is about 2500 km/s.  Magnitude
measurements were obtained from images taken with RETROCAM on the 2.4-m
Hiltner telescope; additional Sloan magnitudes for M31N 2010-01a measured
by Hornoch from 2.4-m telescope images taken by Prieto and Khan:  Jan.
14.082, g' = 16.71 +/- 0.09; 14.087, r' = 16.54 +/- 0.03; 15.096, g' =
16.99 +/- 0.10; 15.100, r' = 16.86 +/- 0.04.


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                         (C) Copyright 2010 CBAT
2010 January 20                  (CBET 2136)              Daniel W. E. Green