H-alpha detection of M31 novae candidates AT2022ouu and AT2022oyb

ATel #15520; G. Goranov (Sofia University, Bulgaria), E. Ovcharov (Sofia University, Bulgaria), T. Petkova, M. Russeva, G. Atanasova, A. Hristova, A. Valcheva (Sofia University, Bulgaria), P. Nedialkov (Sofia University, Bulgaria)
on 22 Jul 2022; 08:39 UT
Credential Certification: Evgeni Ovcharov (evgeni@phys.uni-sofia.bg)

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We report H-alpha photometry of M31 novae AT2022ouu (=PNV J00423928+4115169) (ATel #15516) and AT2022oyb (PNV J00422940+4115430) (ATel #15512). The images were obtained with a 35 cm Newton telescope + CCD SBIG 11000M at Space and Earth Sciences Summer School “Prof. Marin Bachevarov”, Osogovo mountain, Bulgaria. The H-alpha and R-band magnitudes are:

AT2022ouu
2022 July 19.9512 UT, Ha=15.61+/-0.13 (3x180s)
2022 July 20.9507 UT, Ha=15.84+/-0.13 (3x300s)
2022-July 20.9623 UT, R=16.36+/-0.19 (3x300s)

AT2022oyb
2022 July 19.9512 UT, Ha=16.51+/-0.14 (3x180s)
2022 July 20.9507 UT, Ha=16.53+/-0.13 (3x300s)
2022-July 20.9623 UT, R=17.23+/-0.14 (3x300s)

The presence of H-alpha excess for the nova candidates strongly supports their classification as novae.

The observations and image processing are carried out during the ongoing student Space and Earth Sciences Summer School “Prof. Marin Bachevarov” at Osogovo mountain, Bulgaria, organized by Department of Astronomy, Sofia University.

The work was partially supported by NSF Bulgaria grant DN18/10-11.12.2017 and the Ministry of Education and Science of the Republic of Bulgaria, National RI Roadmap Project DO1-383/18.12.2020.