| Full text | |
| Author(s): |
Barbuy, B.
[1]
;
Spite, M.
;
Spite, F.
;
Hill, V.
;
Cayrel, R.
;
Plez, B.
;
Petijean, P.
Total Authors: 7
|
| Affiliation: | [1] Universidade de São Paulo (USP). Instituto de Astronomia, Geofísica e Ciências Atmosféricas - Brasil
Total Affiliations: 7
|
| Document type: | Journal article |
| Source: | Astronomy & Astrophysics; v. 429, n. 3, p. 1031-1042, 2005. |
| Field of knowledge: | Physical Sciences and Mathematics - Astronomy |
| Abstract | |
We have carried out a new determination of abundances in the very metal-poor CH/CN strong stars CS 22948-27 and CS 29497-34, using high-resolution spectra obtained with the HARPS spectrograph at the 3.6 m telescope of ESO, La Silla, that covers the range $\lambda\lambda$ 4000-6900 Å at a resolution of R = 100.000. Both stars are found to be long period binaries. It is confirmed that the abundance patterns show an enhancement of the $\alpha$-elements (like Mg, Ca), of the proton capture elements (like Na and Al) and a strong enrichment in "r" and "s" process elements, where the s-enrichment is probably due to a mass transfer episode from a companion in its AGB phase. The possible origins of the abundance pattern and especially of the strong enhancement of both "s" and "r" elements are discussed. (AU) | |
| FAPESP's process: | 00/10406-4 - Chemical evolution and stellar populations of the galaxy, magellanic clouds and elliptical galaxies, based on spectroscopy and imaging |
| Grantee: | Beatriz Leonor Silveira Barbuy |
| Support Opportunities: | Research Projects - Thematic Grants |