| Texto completo | |
| Autor(es): |
Placco, Vinicius M.
;
Kennedy, Catherine R.
;
Rossi, Silvia
;
Beers, Timothy C.
;
Christlieb, Norbert
;
Sivarani, Thirupathi
;
Cunha, K
;
Spite, M
;
Barbuy, B
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | COSMIC MAGNETIC FIELDS: FROM PLANETS, TO STARS AND GALAXIES; v. N/A, n. 265, p. 2-pg., 2010-01-01. |
| Resumo | |
We have developed a new procedure to search for Carbon-Enhanced Metal-Poor (CEMP) stars from the Hamburg/ESO (HES) prism-survey plates. This method uses an extended line index for the CH G-band, which we demonstrate to have superior behavior when compared to the narrower G-band index formerly employed for these spectra. A first subsample, biased towards brighter stars (B<15.5), has been extracted from the scanned HES plates. After visual inspection (to eliminate spectra compromised by plate defects, overlapping spectra, etc., and to carry out rough spectral classifications), a list of 669 previously unidentified candidate CEMP stars was compiled. Follow-up spectroscopy for a pilot sample of 132 candidates was obtained on the SOAR 4.1m telescope. Our results show that most of the stars observed lie in the targetted metallicity range, and possess prominent carbon absorption features at 4300 angstrom. The success rate for the identification of new CEMP stars is similar to 50% for [Fe/H]< -2.0. For stars with [Fe/H]< -2.5, the ratio increases to 100%. (AU) | |
| Processo FAPESP: | 07/04356-3 - Busca por estrelas muito pobres em metais baseada no enriquecimento em carbono |
| Beneficiário: | Vinicius Moris Placco |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |