H-alpha observations of M31 candidate nova AT2021ypn
ATel #14913; A. Valcheva (Sofia University, Bulgaria), M. Minev (Sofia University; IA and NAO, BAS, Bulgaria), E. Ovcharov (Sofia University, Bulgaria), A. Vinokurov (SAO RAS), P. Nedialkov (Sofia University, Bulgaria)
on 13 Sep 2021; 20:36 UT
Credential Certification: Antoniya Valcheva (valcheva@phys.uni-sofia.bg)
Subjects: Optical, Nova, Transient
We report strong H-alpha emission of M31 nova candidate AT 2021ypn (= PSP21H) discovered on 2021/09/11.602 UT by Xingming Observatory Sky Survey (XOSS).
H-alpha observations were taken on 2021 Sept 11.914 UT with the FoReRo2 focal reducer at the 2m RCC telescope at the NAO Rozhen, Bulgaria. The transient H-alpha magnitude is 15.71 ± 0.03 mag obtained from 3x300 sec co-added CCD frames. Magnitudes in B and R standard filters are also available, respectively, 16.79 ± 0.02 mag (5x240 sec; 2021 Sept 11.909 UT) and 16.39 ± 0.01 mag (5x120 sec; 2021 Sept 11.905 UT). H-alpha and R-band images can be found here.
The H-alpha brightness of the transient strongly supports its classification as nova.
This work was partially supported by the Ministry of Education and Science of the Republic of Bulgaria, National RI Roadmap Project D01-383/18.12.2020 and NSF Bulgaria grant DN18/10-11.12.2017. The work was performed as part of the government contract of the SAO RAS approved by
the Ministry of Science and Higher Education of the Russian Federation.
