2015ApJ...813...56N -
Astrophys. J., 813, 56 (2015/November-1)
Study of the element abundances in HD 140283: the abundance robustness of the weak r- and main r-process stars.
NIU P., CUI W. and ZHANG B.
Abstract (from CDS):
Many works have attempted to investigate the astrophysical origin of the neutron-capture elements in the metal-poor star HD 140283. However, no definite conclusions have been drawn. In this work, using the abundance-decomposed approach, we find that the metal-poor star HD 140283 is a weak r-process star. Although this star is a weak r-process star, its Ba abundance mainly originates from the main r-process. This is the reason that the ratio [Ba/Eu] = -0.58 ± 0.15 for HD 140283 is close to the ratio of the main r-process. Based on the comparison of the abundances in the six-weak r-process stars, we find that their element abundances possess a robust nature. On the other hand, we find that the robust nature of the abundance of the extreme main r-process stars ([r/Fe] ≥ 1.5) can be extended to the lighter neutron-capture elements. Furthermore, the abundance characteristics of the weak r-process and main r-process are investigated. The abundance robustness of the two category r-process stars could be used as the constraint of the r-process theory and could be used to investigate the astrophysical origins of the elements in the metal-poor stars and population I stars.
Abstract Copyright:
∼
Journal keyword(s):
nuclear reactions, nucleosynthesis, abundances - stars: individual: HD 140283
Simbad objects:
12
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2015ApJ...813...56N and select 'bookmark this link' or equivalent in the popup menu