CAOSP abstracts, Volume: 54, No.: 2, year: 2024

Author(s): Dubovský, P.A.; Petrík, K.; Breus, V.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 54, no. 2, p. 128-134.
Date: 02/2024
Title: Nova Herculi 2021 as an intermediate polar
Keyword(s): cataclysmic variables, novae
Pages: 128 -- 134
DOI: https://doi.org/10.31577/caosp.2024.54.2.128
NASA ADS Abstract Service: 2024CoSka..54b.128D
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: We report the results of observations of Nova Herculi 2021 - V1674 Her. The object is characterized by several exceptional properties. The progenitor was identified as an intermediate polar. The speed of the outflow reached 10000 km s^-1. The brightness decline was exceptionally rapid: t₂ ≅ 1.2 d, t₃ ≅ 3 d. The pulse spin signal was detected in photometry soon after the nova eruption. Extremely fast spin-up of the white dwarf rotation was measured. Despite challenges in cycle counting, we successfully constructed the O-C diagram of spin pulse maxima based on three seasons of observations. The result suggests a stable spin acceleration, with an anticipated gradual decline over the next decades. Additionally, we investigated the evolution of the orbital period.