Spectroscopic confirmation and photometry of the nova candidate AT 2024ynw
ATel #16874; A. S. Vinokurov, A. S. Sarkisyan (SAO RAS)
on 25 Oct 2024; 11:57 UT
Credential Certification: Alexander Vinokurov (vinokurov@sao.ru)
Subjects: Optical, Nova, Transient
We present the results of optical photometry and spectroscopy of PNV J00430343+4118310 (= AT 2024ynw), a nova candidate in M31 discovered a few days ago (ATel #16869, #16870). Three V band images with 10 sec exposures and the two spectra with 600 sec exposures (spectral resolution ~5 Å in the ~3600-5400 Å range) were obtained with the SCORPIO multi-mode focal reducer at the Russian 6m telescope (BTA) on October 24.03 UT. There were poor sky conditions (dense cirrus clouds) during the spectroscopy, the seeing was about 1.5".
The measured magnitudes was V = 17.26 ± 0.04. We use the Massey's M31 catalog (Massey et al. 2006, AJ, 131, 2478) stars as the reference for absolute calibration. The spectra reveal the hydrogen, Ca II H and K and numerous Fe II lines with P Cyg-type profiles. Based on the obtained spectrum the most preferable classification is Fe II nova. The velocity of the absorption with respect to the emission component in the least noisy line in spectrum H-beta is about 970 km/s, while for Fe II lines the difference between the components is in range from ~850 to ~1200 km/s (the spectrum can be found
here).
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. Observations with the SAO RAS telescopes are supported by the Ministry of Science and Higher Education of the Russian Federation. The renovation of telescope equipment is currently provided within the national project "Science and Universities".
