7Be detection in the 2021 outburst of RS Oph
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7Be detection in the 2021 outburst of RS Oph. / Molaro, P.; Izzo, L.; Selvelli, P.; Bonifacio, P.; Aydi, E.; Cescutti, G.; Guido, E.; Harvey, E. J.; Hernanz, M.; Della Valle, M.
In: Monthly Notices of the Royal Astronomical Society, Vol. 518, No. 2, 24.09.2022, p. 2614-2626.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - 7Be detection in the 2021 outburst of RS Oph
AU - Molaro, P.
AU - Izzo, L.
AU - Selvelli, P.
AU - Bonifacio, P.
AU - Aydi, E.
AU - Cescutti, G.
AU - Guido, E.
AU - Harvey, E. J.
AU - Hernanz, M.
AU - Della Valle, M.
PY - 2022/9/24
Y1 - 2022/9/24
N2 - The recurrent nova RS Oph underwent a new outburst on 2021 August 8, 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 at ESO-VLT in Parana) enabled detection of the possible presence of Be-7 newly made in the thermonuclear runaway reactions. The Be-7 yields can be estimated at N(Be-7)/N(H) = 5.7 x 10(-6), which are close to the lowest yields measured in classical novae so far. Be-7 is short-lived and decays only into Li-7. By means of a spectrum taken during the nebular phase we estimated an ejected mass of approximate to 1.1 x 10(-5) M-circle dot, providing an amount of approximate to 4.4 x 10(-10) M-circle dot of Li-7 created in the 2021 event. Recurrent novae of the RS Oph type may synthesize slightly lower amounts of Li-7 per event than classical novae, but occur 10(3) 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 the Li-7 that we observe today. The detection of Be-7 in RS Oph provides further support to the recent suggestion that novae are the most effective source of Li-7 in the Galaxy.
AB - The recurrent nova RS Oph underwent a new outburst on 2021 August 8, 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 at ESO-VLT in Parana) enabled detection of the possible presence of Be-7 newly made in the thermonuclear runaway reactions. The Be-7 yields can be estimated at N(Be-7)/N(H) = 5.7 x 10(-6), which are close to the lowest yields measured in classical novae so far. Be-7 is short-lived and decays only into Li-7. By means of a spectrum taken during the nebular phase we estimated an ejected mass of approximate to 1.1 x 10(-5) M-circle dot, providing an amount of approximate to 4.4 x 10(-10) M-circle dot of Li-7 created in the 2021 event. Recurrent novae of the RS Oph type may synthesize slightly lower amounts of Li-7 per event than classical novae, but occur 10(3) 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 the Li-7 that we observe today. The detection of Be-7 in RS Oph provides further support to the recent suggestion that novae are the most effective source of Li-7 in the Galaxy.
KW - stars: individual: RS Oph; stars: novae
KW - novae, cataclysmic variables
KW - Galaxy: abundances
KW - Galaxy: evolution
KW - GAMMA-RAY LINES
KW - RECURRENT NOVA
KW - CLASSICAL NOVAE
KW - LITHIUM
KW - LI-7
KW - OPHIUCHI
KW - EVOLUTION
KW - EMISSION
KW - PROGENITORS
KW - ABSORPTION
U2 - 10.1093/mnras/stac2708
DO - 10.1093/mnras/stac2708
M3 - Journal article
VL - 518
SP - 2614
EP - 2626
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 2
ER -
ID: 333618991