Heavy-element abundances in the CH/CN-strong very metal-poor stars CS 22948-27 and CS 29497-34

Details Heavy-element abundances in the CH/CN-strong very metal-poor stars CS 22948-27 and CS 29497-34 Heavy-element abundances in the CH/CN-strong very metal-poor stars CS 22948-27 and CS 29497-34

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...353..557h&link_type=abstract

Astronomy and Astrophysics, v.353, p.557-568 (2000)

Astronomy and Astrophysics

Astrophysics

69

Stars: Abundances, Stars: Fundamental Parameters, Stars: General

Scientific paper

We have carried out a new analysis of the very metal-poor CH/CN strong stars CS 22948-27 and CS 29497-34. In particular, the effective temperatures were recomputed by comparing newly obtained photometric data to colours derived from model atmospheres computed especially for these stars. Metallicities of [Fe/H] = -2.45 and -2.90 are found, respectively, for CS 22948-27 and CS 29497-34. The abundances of heavy elements have been derived from newly obtained high-resolution spectroscopy in the blue spectral region, together with previously obtained spectra in the red, resulting in a total wavelength coverage of lambda lambda 4000-8200 Ä. We find that the abundance patterns of our stars reflect enrichment by the r-process (as indicated by a high Eu abundance), as well as by the s-process, which could be due to a mass transfer episode from a companion crossing the AGB phase, although no clear evidence for binarity is indicated in the spectra obtained to date. Observations collected at the European Southern Observatory (ESO), La Silla, Chile.

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