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7Be detection in the 2021 outburst of RS Oph

Abstract : The recurrent nova RS Oph underwent a new outburst on August 8, 2021, reaching a visible brightness of V = 4.8 mag. Observations of the 2021 outburst made with the high resolution UVES spectrograph at the Kueyen-UT2 telescope of ESO-VLT in Paranal enabled detection of the possible presence of 7Be freshly made in the thermonuclear runaway reactions. The 7Be yields can be estimated in N(7Be)/N(H) = 5.7 · 10-6, which are close to the lowest yields measured in classical novae so far. 7Be is short-lived and decays only into 7Li. By means of a spectrum taken during the nebular phase we estimated an ejected mass of ≍ 1.1 · 10-5 M, providing an amount of ≍ 4.4 · 10-10 M of 7Li created in the 2021 event. Recurrent novae of the kind of RS Oph may synthesize slightly lower amount of 7Li per event as classical novae, but occur 103 times more frequently. The recurrent novae fraction is in the range of 10-30 per cent and they could have contributed to the making of 7Li we observe today. The detection of 7Be in RS Oph provides further support to the recent suggestion that novae are the most effective source of 7Li in the Galaxy.
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https://hal-insu.archives-ouvertes.fr/insu-03849375
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, November 11, 2022 - 4:29:07 PM
Last modification on : Thursday, November 24, 2022 - 5:02:58 PM

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P. Molaro, L. Izzo, P. Selvelli, P. Bonifacio, E. Aydi, et al.. 7Be detection in the 2021 outburst of RS Oph. Monthly Notices of the Royal Astronomical Society, 2022, ⟨10.1093/mnras/stac2708⟩. ⟨insu-03849375⟩

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