dc.contributor.author |
Goswami, P. P |
|
dc.contributor.author |
Goswami, A |
|
dc.date.accessioned |
2021-06-27T04:09:49Z |
|
dc.date.available |
2021-06-27T04:09:49Z |
|
dc.date.issued |
2020-12 |
|
dc.identifier.citation |
Journal of Astrophysics and Astronomy, Vol. 41, No. 1, 47 |
en_US |
dc.identifier.issn |
0973-7758 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/7714 |
|
dc.description |
Restricted Access |
en_US |
dc.description |
The original publication is available at springerlink.com |
|
dc.description.abstract |
The surface chemical compositions of a large fraction of carbon-enhanced metal-poor (CEMP) stars, the so-called CEMP-r/s stars, are known to exhibit enhancement of both s-process and r-process elements. For these stars, the heavy-element abundances cannot be explained either by s-process or r-processnucleosynthesis alone, as the production sites of s-process and r-process elements are very different, and these two processes produce distinct abundance patterns. Thus, the observational evidence of the doubleenhancement seen in CEMP-r/s stars remains a puzzle as far as the origin of the elements is concerned. In this work, we have critically analysed the observed abundances of heavy elements in a sample of eight CEMP-r/s stars from the literature to trace the origin of the observed double enhancement. Towards this, we have conducted a parametric-model-based analysis to delineate the contributions of s-process and r-process nucleosynthesis to the observed elemental abundances. We have further examined if the i-process (intermediate-process) nucleosynthesis that occurs at high neutron density (n∼1015 cm−3) produced during proton ingestion from a H-rich envelope to the intershell region of an AGB star, which is capable of producing both r-process and s-process elements in a single stellar site, could explain the observed abundance patterns of the sample stars. Our analysis shows that the observed abundance patterns of the selected sample of CEMP-r/s stars could be fairly well reproduced using the i-process model yields. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Indian Academy of Sciences |
en_US |
dc.relation.uri |
https://doi.org/10.1007/s12036-020-09670-7 |
|
dc.rights |
© Indian Academy of Sciences |
|
dc.subject |
Stars |
en_US |
dc.subject |
Nucleosynthesis |
en_US |
dc.subject |
i-process |
en_US |
dc.title |
i-Process nucleosynthesis: Observational evidences from CEMP stars |
en_US |
dc.type |
Article |
en_US |