Detection of ${}^7$Be II in the Classical Nova V5669 Sgr (Nova Sagittarii 2015 No.3)

Abstract

We report the new detection of ${}^7$Be II in the ultraviolet spectra of V5669 Sgr during its early decline phase ($+24$ and $+28$ d). We identified three blue-shifted absorption systems in our spectra. The first two, referred to as low- and high-velocity components, were noticeably identified among H I Balmer, Na I D, and Fe II whose lower energies of transients are low ($<4$ eV). The third absorption component was identified among N II, He I, and C II lines whose lower energy levels are relatively high (9--21 eV). The absorption lines of ${}^7$Be II at $3130.583$ Å, and $3132.228$ Å were identified as the first and second components in our observations. No evidence suggested the existence of Li I at 6708 Å in any velocity components. The estimated number density ratio of lithium relative to hydrogen, which was finally produced by this object using the equivalent widths of ${}^7$Be and Ca II K, $N({}^7\mathrm{Li})/N(\mathrm{H}{)}_{\mathrm{final}}$ is $4.0\pm 0.7\times 10^{-6}$. This value is an order of magnitude lower than the average observed values for classical novae wherein ${}^7$Be has been detected, and is comparable to the most optimistic value of theoretical predictions.

arXiv comment21 pages, 7 figures, accepted by ApJ

References in corpus (24)

• The chemical composition of the Sun
• Modules for Experiments in Stellar Astrophysics (MESA)
• The SIMBAD astronomical database
• Nucleosynthesis in Classical Novae: ONe vs. CO White Dwarfs
• Evolutionary and pulsational properties of white dwarf stars
• Optical Imaging of Nova Shells and the Maximum Magnitude-Rate of Decline Relationship
• Studies of Diffuse Interstellar Bands. V. Pairwise Correlations of Eight Strong DIBs and Neutral Hydrogen, Molecular Hydrogen, and Color Excess
• Production and evolution of Li, Be and B isotopes in the Galaxy
• Explosive lithium production in the classical nova V339 Del (Nova Delphini 2013)
• The Stony Brook / SMARTS Atlas of mostly Southern Novae
• Carbon-Oxygen Classical Novae are Galactic ${}^7$Li Producers as well as Potential Supernova Ia Progenitors
• Early optical spectra of nova V1369 Cen show presence of Lithium
• Transient Heavy Element Absorption Systems in Novae: Episodic Mass Ejection from the Secondary Star
• Highly Enriched 7Be in the ejecta of Nova Sagittarii 2015 No. 2 (V5668 Sgr) and the Galactic Lithium origin
• A fully automated data reduction pipeline for the FRODOSpec integral field spectrograph
• 123-321 Models of Classical Novae
• The ${}^7$Be II Resonance Lines in Two Classical Novae V5668 Sgr and V2944 Oph
• ${}^7$Li evolution in the thin and thick disks of the Milky Way
• A New Catalogue of Galactic Novae: Investigation of the MMRD relation & Spatial Distribution
• A Light Curve Analysis of 32 Recent Galactic Novae --- Distances and White Dwarf Masses
• Beryllium detection in the very fast nova ASASSN-16kt (V407 Lupi)
• Search for 7Be in the outburst of four recent novae
• A Universal Decline Law of Classical Novae. IV. V838 Her (1991): A Very Massive White Dwarf
• Absorption and emission features of ${}^7$Be{\sc II} in the outburst spectra of V838 Her (Nova Her 1991)

Cited by in corpus (7)

• 7Be detection in the 2021 outburst of RS Oph
• Novae: An Important Source of Lithium in the Galaxy
• Lithium evolution in the Galactic thin disc from Main-Sequence and early Red-Giant-Branch stars
• Unevolved Li-rich stars at low metallicity: a possible formation pathway through novae
• Gaia-Sausage-Enceladus: Lithium evolution from early red-giant-branch and main-sequence stars
• Viability of novae as sources of Galactic lithium
• 7Be in the outburst of the ONe nova V6595 Sgr