Persistent nuclear burning in Nova Sgr 2016 N.4 (=V5856 Sgr = ASASSN-16ma) six years past its outburst
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Archivos
Fecha
2022-11-01
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
EDP Sciences
Nombre de Curso
Licencia CC
CC BY 4.0 DEED
Attribution 4.0 International
Licencia CC
https://creativecommons.org/licenses/by/4.0/
Resumen
We report on the fast Nova Sgr 2016 N.4 being surprisingly trapped in a long-lasting and bright plateau (ΔI≥10 mag above quiescence) six years past the nova eruption. Very few other novae experience a similar occurrence. We carried out an intensive observing campaign collecting daily BVRI photometry and monthly high-resolution optical spectroscopy, and observed the nova in ultraviolet and X-rays with Swift at five distinct epochs. The bolometric luminosity radiated during the plateau is ∼4200 L⊗ (scaled to the distance of the Galactic Bulge), corresponding to stable nuclear burning on a 0.6 M⊗ white dwarf. A stable wind is blown off at full width at zero intensity (FWZI) ∼ 1600 km s-1, with episodic reinforcement of a faster FWZI ∼ 3400 km s-1 mass loss, probably oriented along the polar directions. The collision of these winds could power the emission detected in X-rays. The burning shell has an outer radius of ∼25 R⊗ at which the effective temperature is ∼7600 K, values similar to those of a F0 II/Ib bright giant. The Δm < 1 mag variability displayed during the plateau is best described as chaotic, with the irregular appearance of quasi-periodic oscillations with a periodicity of 15-17 days. A limited amount of dust (≈3 × 10-11 M⊗) continuously condenses at Tdust ∼ 1200 K in the outflowing wind, radiating Ldust ∼ 52 L⊗. © U. Munari et al. 2022.
Notas
Indexación: Scopus.
Palabras clave
Cataclysmic variables, Novae, Outflows, Stars: winds, Bolometric luminosities, Galactic bulge, High resolution, Long lasting, Nova, Nuclear burning, Optical spectroscopy, Stars: winds, White dwarfs
Citación
Astronomy and Astrophysics, Volume 667, 1 November 2022, Article number A7
DOI
10.1051/0004-6361/202244498