Published 2017
| Version v1
Publication
The impact of the revised 17 O(p, α)14 N reaction rate on 17 O stellar abundances and yields
Creators
- Straniero, O.
- Bruno, C. G.
- Aliotta, M.
- Best, A.
- Boeltzig, A.
- Bemmerer, D.
- Broggini, C.
- Caciolli, A.
- CAVANNA, FRANCESCA
- Ciani, G. F.
- CORVISIERO, PIETRO
- Cristallo, S.
- Davinson, T.
- Depalo, R.
- Di Leva, A.
- Elekes, Z.
- FERRARO, FEDERICO
- Formicola, A.
- Fülöp, Z.
- Gervino, G.
- Guglielmetti, A.
- Gustavino, C.
- Gyürky, G.
- Imbriani, G.
- Junker, M.
- Menegazzo, R.
- Mossa, V.
- Pantaleo, F. R.
- Piatti, D.
- Piersanti, L.
- PRATI, PAOLO
- Samorjai, E.
- Strieder, F.
- Szucs, T. d.
- Takacs, M. P.
- Trezzi, D. K.
Contributors
Others:
- Straniero, O.
- Bruno, C. G.
- Aliotta, M.
- Best, A.
- Boeltzig, A.
- Bemmerer, D.
- Broggini, C.
- Caciolli, A.
- Cavanna, Francesca
- Ciani, G. F.
- Corvisiero, Pietro
- Cristallo, S.
- Davinson, T.
- Depalo, R.
- Di Leva, A.
- Elekes, Z.
- Ferraro, Federico
- Formicola, A.
- Fülöp, Z.
- Gervino, G.
- Guglielmetti, A.
- Gustavino, C.
- Gyürky, G.
- Imbriani, G.
- Junker, M.
- Menegazzo, R.
- Mossa, V.
- Pantaleo, F. R.
- Piatti, D.
- Piersanti, L.
- Prati, Paolo
- Samorjai, E.
- Strieder, F.
- Szucs, T. d.
- Takacs, M. P.
- Trezzi, D. K.
Description
Context. Material processed by the CNO cycle in stellar interiors is enriched in 17O. When mixing processes from the stellar surface
reach these layers, as occurs when stars become red giants and undergo the first dredge up, the abundance of 17O increases. Such an
occurrence explains the drop of the 16O/17O observed in RGB stars with mass larger than solar mass 1:5M solar mass. As a consequence, the interstellar
medium is continuously polluted by the wind of evolved stars enriched in 17O .
Aims. Recently, the Laboratory for Underground Nuclear Astrophysics (LUNA) collaboration released an improved rate of the
17O(p; a)14N reaction. In this paper we discuss the impact that the revised rate has on the 16O/17O ratio at the stellar surface and
on 17O stellar yields.
Methods.We computed stellar models of initial mass between 1 and 20M solar mass and compared the results obtained by adopting the revised
rate of the 17O(p; a)14N to those obtained using previous rates.
Results. The post-first dredge up 16O/17O ratios are about 20% larger than previously obtained. Negligible variations are found in the
case of the second and the third dredge up. In spite of the larger 17O(p; a)14N rate, we confirm previous claims that an extra-mixing
process on the red giant branch, commonly invoked to explain the low carbon isotopic ratio observed in bright low-mass giant stars,
marginally affects the 16O/17O ratio. Possible effects on AGB extra-mixing episodes are also discussed. As a whole, a substantial
reduction of 17O stellar yields is found. In particular, the net yield of stars with mass ranging between 2 and 20 solar mass is 15 to 40%
smaller than previously estimated.
Conclusions. The revision of the 17O(p; a)14N rate has a major impact on the interpretation of the 16O/17O observed in evolved
giants, in stardust grains and on the 17O stellar yields.
Additional details
Identifiers
- URL
- http://hdl.handle.net/11567/858509
- URN
- urn:oai:iris.unige.it:11567/858509
Origin repository
- Origin repository
- UNIGE