H-alpha confirmation of three novae in M31
ATel #7789; E. Ovcharov, M. Minev, V. Bozhilov, P. Nedialkov, A. Valcheva (University of Sofia, Bulgaria), P. Nikolov (IA-NAO, BAS)
on 12 Jul 2015; 15:27 UT
Credential Certification: Evgeni Ovcharov (evgeni@phys.uni-sofia.bg)
We report strong excess in H-alpha emission of four novae, three of which have not been spectroscopically confirmed yet. The objects are: PNV J00424660+4117553 = 2015-05a? (ATel#7492); PNV J00431911+4116082 = 2015-05b? (ATel#7554, ATel#7564, ATel#7580, ATel#7586); PNV J00423445+4116443 = 2015-05c? (ATel#7603); PNV J00431983+4123071 = 2015-06b? (ATel#7713). The last reported nova in M31 - PNV J00424534+4119303 =2015-07a? (ATel#7766) is not visible in all R and H-alpha images.
The observations are carried out during two nights with the 2m RCC telescope at Rozhen NAO, Bulgaria, equiped with focal reducer FoReRo2.
The obtained magnitudes are:
2015-05a
2015 July 11.041 UT, Ha=18.14+/-0.19, (3x180s)
2015 July 11.035 UT, R=[18.5, (1x120s)
2015 July 12.024 UT, Ha=17.31+/-0.06, (5x180s)
2015 July 12.014 UT, R=[19.3, (9x60s)
2015-05b (spectroscopically confirmed as FeII type nova)
2015 July 11.041 UT, Ha=17.45+/-0.05, (3x180s)
2015 July 11.035 UT, R=[19.5, (1x120s)
2015 July 12.024 UT, Ha=17.79+/-0.05, (5x180s)
2015 July 12.014 UT, R=[20.0, (9x60s)
2015-05c
2015 July 11.041 UT, Ha=16.24+/-0.04, (3x180s)
2015 July 11.035 UT, R=[18.5, (1x120s)
2015 July 12.024 UT, Ha=16.19+/-0.03, (5x180s)
2015 July 12.014 UT, R=18.41+/-0.11, (9x60s)
2015-06b
2015 July 11.041 UT, Ha=16.81+/-0.04, (3x180s)
2015 July 11.035 UT, R=[19.5, (1x120s)
2015 July 12.024 UT, Ha=16.80+/-0.03, (5x180s)
2015 July 12.014 UT, R=19.56+/-0.09, (9x60s)
2015-07a
2015 July 11.041 UT, Ha=[19.0, (3x180s)
2015 July 11.035 UT, R=[19.0, (1x120s)
2015 July 12.024 UT, Ha=[19.3, (3x180s)
2015 July 12.014 UT, R=[19.8, (9x60s)
The strong H-alpha emission, relative to the faint R-band magnitude for all four objects, strongly supports their classification as novae.
