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H-alpha Confirmation of Six Novae in M31

ATel #5503; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), A. Manilla-Robles (ING, La Palma and University of La Laguna, Tenerife, Spain), V. Tudor, O. Vaduvescu (ING, La Palma, Spain), G. Ramsay (Armagh Observatory, Northern Ireland)
on 23 Oct 2013; 20:31 UT
Credential Certification: Allen W. Shafter (aws@nova.sdsu.edu)

Subjects: Optical, Nova, Transient

We obtained four 200-s narrow-band H-alpha and four 100-s Sloan r'-band CCD frames of the central region of M31 on 2013 Oct. 20.851 and 20.865 UT, respectively, with the 2.5-m Isaac Newton Telescope + WFC at La Palma under ~1.5" seeing. The single frames were co-added and the co-added images were used for photometry of 8 M31 nova candidates (see the table below). Of these, 6 have not yet been spectroscopically confirmed, namely PNV J00424239+4117190 (ATel #5475), PNV J00430954+4115399 (ATel #5468), PNV J00424654+4117006 (ATel #5450), TCP J00430048+4112366 (CBAT TOCP) , TCP J00431492+4119128 (ATel #5384, #5385), and PNV J00424974+4117303 (ATel #5265).

The following magnitudes were obtained:

 
  TOCP designation     CBAT designation   H-alpha mag      Sloan r' mag     Notes 
 
PNV J00424239+4117190   M31N 2013-10e?   15.51 +/- 0.03   17.84 +/- 0.10 
PNV J00430954+4115399   M31N 2013-10c?   17.95 +/- 0.07   19.2  +/- 0.15 
PNV J00424654+4117006   M31N 2013-10b?   16.37 +/- 0.04   18.5  +/- 0.15 
PNV J00432422+4118192   M31N 2013-10a    15.85 +/- 0.03   18.09 +/- 0.08    (1) 
TCP J00430048+4112366   M31N 2013-09c?   17.35 +/- 0.06   19.8  +/- 0.15 
TCP J00431492+4119128   M31N 2013-09a?   17.43 +/- 0.06   19.8  +/- 0.2 
PNV J00424974+4117303   M31N 2013-08b?   17.09 +/- 0.05   19.9  +/- 0.2 
PNV J00425987+4120379   M31N 2013-06b?   17.84 +/- 0.07   20.5  +/- 0.25    (2) 
 
(1) "Fe II" spectroscopic-class nova, see ATel #5442, CBET #3673 
(2) For references see ATel #5157, #5172, #5173 

Significant excess H-alpha emission is present in all 8 objects, strongly supporting their identification as novae.

This work is based on observations made with the Isaac Newton Telescope (INT) operated on the island of La Palma by the Isaac Newton Group (ING) in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias (IAC).