Molaro, P, Izzo, L, D'Odorico, V, Aydi, E, Bonifacio, P, Cescutti, G, Harvey, EJ, Hernanz, M, Selvelli, P and della Valle, M (2021) 7Be in the outburst of the ONe nova V6595 Sgr. Monthly Notices of the Royal Astronomical Society, 509 (3). pp. 3258-3267. ISSN 0035-8711

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Abstract

We report on the search for the 7Be II isotope in the outbursts of the classical nova V6595 Sgr by means of high-resolution Ultraviolet and Visual Echelle Spectrograph (UVES) observations taken at the European Southern Observatory’s Very Large Telescope in 2021 April, about two weeks after its discovery and under difficult circumstances due to the pandemic. Narrow absorption components with velocities at ∼ −2620 and −2820 km s−1, superposed on broader and shallow absorption, are observed in the outburst spectra for the 7Be II λλ313.0583, 313.1228 nm doublet resonance lines, as well as in several other elements such as Ca II, Fe I, Mg I, Na I, H I and Li I. Using the Ca II K line as a reference element, we infer N(7Be)/N(H) ≈ 7.4 × 10−6, or ≈ 9.8 × 10−6 when the 7Be decay is taken into account. The 7Be abundance is about half of the value most frequently measured in novae. The possible presence of overionization in the layers where 7Be II is detected is also discussed. Observations taken at the Telescopio Nazionale Galileo in La Palma 91 days after discovery showed prominent emission lines of oxygen and neon, which allow us to classify the nova as ONe type. Therefore, although 7Be is expected to be higher in CO novae, it is found at comparable levels in both nova types.

Item Type:	Article
Additional Information:	This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 the Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords:	ABSORPTION; abundances; Astronomy & Astrophysics; cataclysmic variables; ELEMENTS; EMISSION; EVOLUTION; Galaxy: evolution; GAMMA-RAY LINES; GIANT; LI-7; LITHIUM; novae; nuclear reactions; nucleosynthesis; ORIGIN; Physical Sciences; Science & Technology; stars: abundances; stars: individual: V6595 Sgr; V5668 SGR; Science & Technology; Physical Sciences; Astronomy & Astrophysics; nuclear reactions; nucleosynthesis; abundances; stars: abundances; stars: individual: V6595 Sgr; novae; cataclysmic variables; Galaxy: evolution; GAMMA-RAY LINES; V5668 SGR; LITHIUM; LI-7; EVOLUTION; EMISSION; GIANT; ABSORPTION; ELEMENTS; ORIGIN; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press
SWORD Depositor:	A Symplectic
Date Deposited:	10 Oct 2022 15:16
Last Modified:	05 Jan 2023 15:30
DOI or ID number:	10.1093/mnras/stab3106
URI:	https://researchonline.ljmu.ac.uk/id/eprint/17791

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