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H-alpha confirmation of two recent disc novae in M 31

ATel #3499; V. Burwitz (Max-Planck-Institut fuer extraterrestrische Physik, MPE, Observatorio Astronomico de Mallorca, OAM), M. Henze (MPE), W. Pietsch (MPE), S. Holmes (The Open University, OU), U. Kolb (OU), C. A. Haswell (OU) J. Rodriguez (OAM)
on 19 Jul 2011; 09:21 UT
Credential Certification: Wolfgang Pietsch (wnp@mpe.mpg.de)

Subjects: Optical, Nova

Referred to by ATel #: 3533

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).

In the images we detect the following nova candidates for which we give CBAT name, time of observation (UT), position, filter, and magnitude in the table below.

 
Name                   2011-07-     RA           Dec      Filter  Mag 

PNV J00412307+4106174 5.056 00h41m23.06s +41°06'17.3" Cl 19.4 PNV J00412307+4106174 5.082 00h41m23.09s +41°06'17.5" R 19.2 PNV J00412307+4106174 5.115 00h41m22.95s +41°06'17.3" HA 17.7
PNV J00420269+4102545 5.056 00h42m02.73s +41°02'54.5" Cl 19.3 PNV J00420269+4102545 5.082 00h42m02.69s +41°02'54.7" R 19.1 PNV J00420269+4102545 5.115 00h42m02.74s +41°02'54.3" HA 17.5
We also report additional magnitudes obtained for the following nova reported in ATel #3486:
PNV J00430685+4115308 5.056 00h43m06.85s +41°15'30.7" Cl 16.8 PNV J00430685+4115308 5.082 00h43m06.85s +41°15'30.8" R 16.8 PNV J00430685+4115308 5.115 00h43m06.85s +41°15'31.0" HA 16.3

The significant H-alpha detections of PNV J00412307+4106174 (30 days after 1st detection on 2011 06 05.799 by Nishiyama and Kabashima, private communication) and PNV J00420269+4102545 (38 days after 1st detection on 2011 05 28.441, Pietsch et al., CBAT-TOCP page) clearly support classifying them as novae (see also ATels #2234 and #1602).

Positions (J2000, accuracy of 0.3") and magnitudes (accuracy of 0.3mag) given for all 3 filters are obtained from photometric solutions using the positions and R magnitudes given in the Local Group Galaxy Survey M 31 catalogue (Massey et al. 2006, AJ, 131, 2478).