[IAUC] CBET 2391: 20100724 : NOVAE IN M31
quai en cfa.harvard.edu
quai en cfa.harvard.edu
Sab Jul 24 12:30:45 ART 2010
Electronic Telegram No. 2391
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director: Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
Sciences; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbat en iau.org; cbatiau en eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html
NOVAE IN M31
Kamil Hornoch, Astronomical Institute, Ondrejov; and Jesus M. Corral-
Santana and Jorge Casares, Instituto de Astrofisica de Canarias and
Universidad de La Laguna, report Sloan r' and narrow-band H_alpha photometry
of recently discovered transients in M31 designated M31N 2010-06a, M31N
2010-06b, M31N 2010-06c, M31N 2010-06d, and M31N 2010-07a. Sloan r' and
narrow-band H_alpha CCD frames were taken by Corral-Santana with the 2.54-m
Isaac Newton Telescope (+ WFC) at La Palma on July 10.200, 10.210, and 11.210
UT. When comparing measurements in Sloan r' and H_alpha, they notice strong
excess in H_alpha emission, suggesting that these objects are novae. The
only exception is M31N 2010-07a, but the measurements for this object are
fully consistent with a young nova having still weak H_alpha emission.
Sloan r' and [H_alpha] magnitudes measured by Hornoch for M31N 2010-06a
(cf. CBET 2341): July 10.200 UT, r' = 17.86 +/- 0.05; 10.210, [H_alpha] =
16.25 +/- 0.07; 11.210, r' = 18.05 +/- 0.05. Magnitudes for M31N 2010-06b
(cf. CBET 2342): July 10.200, r' = 19.48 +/- 0.08; 10.210, [H_alpha] = 17.7
+/- 0.1; 11.210, r' = 19.54 +/- 0.06. Magnitudes for M31N 2010-06c (cf.
CBET 2343): July 10.200, r' = 18.89 +/- 0.06; 10.210, [H_alpha] = 16.63 +/-
0.07; 11.210, r' = 18.95 +/- 0.04. Magnitudes for M31N 2010-06d (cf. CBET
2347): July 10.200, r' = 19.31 +/- 0.07; 10.210, [H_alpha] = 18.1 +/- 0.1;
11.210, r' = 19.24 +/- 0.06. Magnitudes for M31N 2010-07a (cf. CBET 2358):
July 10.200, r' = 17.31 +/- 0.05; 10.210, [H_alpha] = 17.34 +/- 0.08;
11.210, r' = 17.91 +/- 0.04.
Kamil Hornoch, Astronomical Institute, Ondrejov; Jose L. Prieto, Carnegie
Observatories; and Ondrej Pejcha, Department of Astronomy, Ohio State
University, report low-resolution optical spectroscopy (range 370-930 nm,
resolution 0.7 nm) and optical photometry of M31N 2010-06a, M31N 2010-06b, and
M31N 2010-07a. Spectra were obtained by Prieto with the APO 3.5-m telescope
(+ DIS) on July 18 UT. Magnitude measurements were obtained from co-added
R-band images taken with the 0.65-m telescope (+ G2CCD-3200) at Ondrejov.
The spectrograms are posted at the following website URL:
http://users.obs.carnegiescience.edu/jose/novae_m31.pdf.
A spectrogram of M31N 2010-06a, taken by Prieto 21 days after its first
optical detection by Hornoch, exhibits prominent emission lines of Balmer
series, Fe II, and O I (777.4- and 844.6-nm), confirming the object as an "Fe
II"-class nova. The FWHM of the H-alpha is 1600 km/s. The following
additional R-band magnitudes were measured for M31N 2010-06a by Hornoch:
June 29.022 UT, 17.4 +/- 0.1 (P. Zasche); 29.034, 17.35 +/- 0.1 (Zasche);
30.003, 17.05 +/- 0.1 (Hornoch); 30.022, 16.9 +/- 0.1 (Hornoch); July 1.022,
17.25 +/- 0.1 (M. Wolf); 2.997, 17.25 +/- 0.1 (Hornoch and Hornochova);
3.025, 17.1 +/- 0.1 (Hornoch and Hornochova); 4.005, 17.2 +/- 0.1 (Hornoch);
4.031, 17.1 +/- 0.1 (Hornoch); 4.956, 17.1 +/- 0.1 (Hornoch); 7.036, 18.0
+/- 0.15 (Hornoch); 8.060, 17.8 +/- 0.1 (Zasche); 9.011, 17.65 +/- 0.1
(Hornoch and Wolf); 9.035, 17.6 +/- 0.1 (Hornoch and Wolf); 14.050, 17.95
+/- 0.1 (Hornoch, Wolf, and Hornochova); 15.010, 17.95 +/- 0.1 (Hornoch and
Wolf); 17.062, 18.05 +/- 0.1 (Hornoch and Hornochova).
A spectrogram of M31N 2010-06b, taken by Prieto 21 days after its
first optical detection by Hornoch, shows prominent emission lines of
Balmer series, Fe II, and O I (777.4-nm and 844.6-nm) as well as emission
of Ca II near-IR triplet confirming the object as an "Fe II"-class nova.
The FWHM of the H-alpha is 760 km/s. The following additional R-band
magnitudes were measured for M31N 2010-06b: June 29.022 UT,
18.9 +/- 0.15 (Zasche); 30.003, 18.8 +/- 0.1 (Hornoch); July 1.022,
18.55 +/- 0.15 (Wolf); 2.997, 17.65 +/- 0.1 (Hornoch and Hornochova);
4.005, 17.8 +/- 0.1 (Hornoch); 4.956, 18.4 +/- 0.15 (Hornoch); 7.036,
19.3 +/- 0.2 (Hornoch); 8.060, 19.4 +/- 0.15 (Zasche); 9.011,
19.4 +/- 0.15 (Hornoch and Wolf); 14.050, 19.5 +/- 0.25 (Hornoch, Wolf,
and Hornochova); 15.010, 19.4 +/- 0.15 (Hornoch and Wolf); 17.062,
19.2 +/- 0.15 (Hornoch and Hornochova).
A spectrogram of M31N 2010-07a, taken by Prieto 11 days after its first
optical detection by Hornoch, shows prominent emission lines of Balmer series,
Fe II, O I (777.4-nm and 844.6-nm), and Ca II near-infrared emission triplet
with strong P-Cygni absorption features. The FWHM of the H-alpha is 1000
km/s. This suggests that the object is young "Fe II"-class nova. The
following additional R-band magnitudes were measured for M31N 2010-07a:
July 9.011 UT, 17.45 +/- 0.1 (Hornoch and Wolf); 9.035, 17.35 +/- 0.1
(Hornoch and Wolf); 14.050, 17.75 +/- 0.1 (Hornoch, Wolf, and Hornochova);
15.010, 17.55 +/- 0.1 (Hornoch and Wolf); 17.062, 17.3 +/- 0.1 (Hornoch and
Hornochova).
Hornoch also reports additional R-band photometry of recent M31 novae as
measured by himself from images taken with the 0.65-m telescope at Ondrejov.
Magnitudes for M31N 2010-05a (cf. CBETs 2305, 2319, and 2341): June 27.034
UT, 18.2 +/- 0.15 (Hornoch); 28.040, 18.1 +/- 0.1 (Hornoch and P. Hornochova);
29.034, 18.4 +/- 0.2 (P. Zasche); 30.022, 18.55 +/- 0.15 (Hornoch); July 3.025,
18.4 +/- 0.15 (Hornoch and Hornochova); 4.031, 18.6 +/- 0.15 (Hornoch).
Magnitudes for M31N 2010-06c (cf. CBET 2343): June 28.014 UT, 17.5 +/-
0.1 (Hornoch and Hornochova); 29.022, 17.45 +/- 0.1 (Zasche); 30.003, 17.65
+/- 0.1 (Hornoch); July 1.022, 17.75 +/- 0.1 (Wolf); 2.997, 18.05 +/- 0.1
(Hornoch and Hornochova); 4.005, 18.3 +/- 0.1 (Hornoch); 4.956, 18.2 +/- 0.15
(Hornoch); 7.036, 18.7 +/- 0.2 (Hornoch); 8.060, 18.55 +/- 0.1 (Zasche).
Magnitudes for M31N 2010-06d (cf. CBET 2347): July 2.997 UT, 18.6 +/-
0.15 (Hornoch and Hornochova); 3.025, 18.4 +/- 0.1 (Hornoch and Hornochova);
4.005, 17.7 +/- 0.1 (Hornoch); 4.031, 17.75 +/- 0.1 (Hornoch); 4.956, 17.5
+/- 0.1 (Hornoch); 7.036, 19.2 +/- 0.2 (Hornoch); 8.060, 19.2 +/- 0.15
(Zasche).
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2010 CBAT
2010 July 24 (CBET 2391) Daniel W. E. Green
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