Study of the fastest classical nova, V1674 Her: Photoionization and Morpho-kinemetic model analysis
arXiv:2310.16619 · doi:10.1093/mnras/stad3295
Abstract
We present the results of the investigation of the nova V1674 Her (2021), recognised as the swiftest classical nova, with days. The distance to the nova is estimated to be 4.97 kpc. The mass and radius of the WD are calculated to be and , respectively. Over the course of one month following the outburst, V1674 Her traversed distinct phases -- pre-maxima, early decline, nebular, and coronal -- displaying a remarkably swift transformation. The nebular lines emerged on day 10.00, making it the classical nova with the earliest observed commencement to date. We modelled the observed optical spectrum using the photoionization code \textsc{cloudy}. From the best-fitting model we deduced different physical and chemical parameters associated withe the system. The temperature and luminosity of the central ionizing sources are found in the range of K and \ergs, respectively. Elements such as He, O, N, and Ne are found to be overabundant compared to solar abundance in both the nebular and coronal phases. According to the model, Fe II abundance diminishes while Ne abundance increases, potentially elucidating the rare hybrid transition between Fe and He/N nova classes. The ejected mass across all epochs spanned from . Morpho-kinematic modelling utilising \textsc{shape} revealed that the nova V1674 Her possesses a bipolar structure with an equatorial ring at the centre and an inclination angle of i = 67 1.5.
arXiv comment19 pages, 17 figures, 6 tables
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