Beryllium detection in the very fast nova ASASSN-16kt (V407 Lupi)

P. Bonifacio (1) , A. de Ugarte Postigo (2, 3) , D. Fernandez (4)

1 GEPI - Galaxies, Etoiles, Physique, Instrumentation
2 NBI - Niels Bohr Institute [Copenhagen]
3 IAA - Instituto de Astrofísica de Andalucía
4 UC - Pontificia Universidad Católica de Chile

We present high-resolution spectroscopic observations of the fast nova ASASSN-16kt (V407 Lup). A close inspection of spectra obtained at early stages has revealed the presence of low-ionization lines, and among the others we have identified the presence of the ionized 7Be doublet in a region relatively free from possible contaminants. After studying their intensities, we have inferred that ASASSN-16kt has produced (5.9-7.7)× 10$^{-9}$ M$_⊙$ of 7Be. The identification of bright Ne lines may suggest that the nova progenitor is a massive (1.2 M$_⊙$) oxygen-neon white dwarf. The high outburst frequency of oxygen-neon novae implies that they likely produce an amount of Be similar, if not larger, to that produced by carbon-oxygen novae, then confirming that classical novae are among the main factories of lithium in the Galaxy.

Mots clés: nuclear reactions; nucleosynthesis; abundances; stars: individual: ASASSN-16kt: V407 Lup; novae; cataclysmic variables; Galaxy: evolution

Domaines: Astrophysique [astro-ph]; Physique [physics]

P. Bonifacio, A. de Ugarte Postigo, D. Fernandez. Beryllium detection in the very fast nova ASASSN-16kt (V407 Lupi). Monthly Notices of the Royal Astronomical Society, 2018, 478 (2), pp.1601-1610. ⟨10.1093/mnras/sty435⟩. ⟨hal-02280923⟩