H-alpha emission of M31 nova candidate M31N 2022-07e
ATel #15537; A. Valcheva (Sofia University, Bulgaria), P. Nedialkov (Sofia University, Bulgaria), E. Ovcharov (Sofia University, Bulgaria)
on 3 Aug 2022; 16:30 UT
Credential Certification: Antoniya Valcheva (valcheva@phys.uni-sofia.bg)
Subjects: Optical, Nova, Transient
Referred to by ATel #: 15569
We report strong H-alpha emission of the recent nova candidate M31N 2022-07e (= AT2022puk) (= XM77MZ) (= PNV J00425697+4116333). The transient is located at RA (J2000)=00h42m56s.97, Dec (J2000)=+41o16'33".3 and was independently discovered by Mi Zhang and Xing Gao (Xingming Observatory Sky Survey (XOSS)) on July 26.860 UT, by Valcheva et al. (ATel #15529) on July 26.9510 UT and by Hornoch and Kucakova (ATel #15532) on July 27.083 UT.
Our observations in the narrow-band H-alpha (FWHM of 3 nm) were carried out in the direct focus at the 2m RCC telescope at NAO Rozhen, Bulgaria. (Discovery image can be found here). The photometry shows that M31N 2022-07eâs H-alpha emission is slowly raising towards maximum. The magnitudes were obtained from 3x300 sec co-added images and are as follows:
2022 Aug 01.9679 UT Ha=15.97±0.02
2022 Aug 03.0391 UT Ha=15.78±0.02.
Additional R-band magnitudes are also available:
2022 Aug 01.9494 UT R=17.93±0.03 (5x120 sec)
2022 Aug 02.9399 UT R=18.08±0.03 (3x120 sec).
The strong H-alpha emission of M31N 2022-07e highly supports its classification as nova in M31 and spectral observations are recommended to determine its spectroscopic class.
The work was partially supported by the Ministry of Education and Science of the Republic of Bulgaria, National RI Roadmap Project DO1-383/18.12.2020 and NSF Bulgaria grant DN18/10-11.12.2017.
