التفاصيل البيبلوغرافية
| العنوان: |
THE 7Be ii RESONANCE LINES IN TWO CLASSICAL NOVAE V5668 SGR AND V2944 OPH. |
| المؤلفون: |
Akito Tajitsu, Kozo Sadakane, Hiroyuki Naito, Akira Arai, Hideyo Kawakita, Wako Aoki |
| المصدر: |
Astrophysical Journal; 2/20/2016, Vol. 818 Issue 2, p1-1, 1p |
| مصطلحات موضوعية: |
FORCED vibration (Mechanics), RESONANCE, OSCILLATIONS, VELOCITY, RADIATION absorption |
| مستخلص: |
We report spectroscopic observations of the resonance lines of singly ionized 7Be in the blueshifted absorption line systems found in the post-outburst spectra of two classical novae—V5668 Sgr (Nova Sagittarii 2015 No. 2) and V2944 Oph (Nova Ophiuchi 2015). The unstable isotope 7Be should have been created during the thermonuclear runaway (TNR) of these novae and decayed to form 7Li within a short period (a half-life of 53.22 days). These confirmations of 7Be are the second and the third ones following the first case found in V339 Del by Tajitsu et al. The blueshifted absorption line systems in both novae are clearly divided into two velocity components, both of which contain 7Be. This means that the absorbing gases in both velocity components consist of products of TNR. We estimated the amounts of 7Be produced during the outbursts of both novae and concluded that significant 7Li should have been created. These findings strongly suggest that the explosive production of 7Li via the reaction 3He(α,γ)7Be and its subsequent decay to 7Li occurs frequently among classical novae and contributes to the process of Galactic Li enrichment. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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