Detected H-alpha emission from the nova candidate AT 2024koe
ATel #16657; A. Valcheva (University of Sofia, Bulgaria), M. Minev, A. Kostov (IA and NAO, BAS, Bulgaria), P. Nedialkov (University of Sofia, Bulgaria)
on 15 Jun 2024; 19:45 UT
Credential Certification: Antoniya Valcheva (valcheva@phys.uni-sofia.bg)
Subjects: Optical, Nova, Transient
We report the detection of a strong H-alpha emission from the recent M31 nova candidate AT 2024koe (M31N 2024-06a) discovered by Balaji Kumar (GEOTS) on 2024 June 08.41239 UT.
Our observations were carried out with the 2m RCC telescope at Rozhen NAO, Bulgaria, equipped with the focal reducer FoReRo2 and narrowband H-alpha filter (FWHM of 3 nm). H-alpha and R-band magnitudes were obtained from 3x300 sec (see here ) and 5x120 sec co-added frames, respectively. The photometric calibration was performed using Massey et al. (2007, 2016) and the magnitudes are shown below:
# Date UT, Filter, Magnitude, Error
2024 June 12.01500 UT, Ha=16.15 ± 0.05 mag
2024 June 12.02569 UT, R =17.34 ± 0.01 mag
The strong H-alpha emission detected in AT 2024koe confirms that the transient is a nova. Spectroscopic observations are encouraged to reveal the nova's spectroscopic class.
This study is financed by the European Union-NextGenerationEU, through the National Recovery and Resilience Plan of the Republic of Bulgaria, project SUMMIT BG-RRP-2.004-0008-C01.
