| Full text | |
| Author(s): |
Galarza, Jhon Yana
[1, 2]
;
Lopez-Valdivia, Ricardo
[3]
;
Melendez, Jorge
[1]
;
Lorenzo-Oliveira, Diego
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Sao Paulo, Dept Astron IAG USP, Rua Matao 1226, Cidade Univ, BR-05508900 Sao Paulo - Brazil
[2] Univ Prebiteriana Mackenzie, Ctr Radio Astron & Astrophys Mackenzie CRAAM, Rua, Consolacao 896, Sao Paulo - Brazil
[3] Univ Texas Austin, Dept Astron, 2515 Speedway, Stop C1400, Austin, TX 78712 - USA
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | ASTROPHYSICAL JOURNAL; v. 922, n. 2 DEC 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Binary stars are supposed to be chemically homogeneous, as they are born from the same molecular cloud. However, high-precision chemical abundances show that some binary systems display chemical differences between the components, which could be due to planet engulfment. In this work, we determine precise fundamental parameters and chemical abundances for the binary system HIP 71726/HIP 71737. Our results show that the pair is truly conatal, coeval, and comoving. We also find that the component HIP 71726 is more metal-rich than HIP 71737 in the refractory elements such as iron, with Delta{[}Fe/H] = 0.11 +/- 0.01 dex. Moreover, HIP 71726 has a lithium abundance 1.03 dex higher than HIP 71737, which is the largest difference in Li detected in twin-star binary systems with Delta T-eff <= 50 K. The ingestion of 9.8(-1.6)(+2.0) M-circle plus of rocky material fully explains both the enhancement in refractory elements and the high Li content observed in HIP 71726, thereby reinforcing the planet-engulfment scenario in some binary systems. (AU) | |
| FAPESP's process: | 16/20667-8 - Stellar chronometers: the relation between age, chromospheric activity, rotation and lithium abundances in solar-type stars |
| Grantee: | Diego Lorenzo de Oliveira |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 18/04055-8 - High precision spectroscopy: from the first stars to planets |
| Grantee: | Jorge Luis Melendez Moreno |
| Support Opportunities: | Research Projects - Thematic Grants |