0000000000338107

AUTHOR

F. J. Zickgraf

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The Hamburg/ESO R-process Enhanced Star survey (HERES)

2004

We report on a dedicated effort to identify and study metal-poor stars strongly enhanced in r-process elements ([r/Fe] > 1 dex; hereafter r-II stars), the Hamburg/ESO R-process Enhanced Star survey (HERES). Moderate-resolution (~2A) follow-up spectroscopy has been obtained for metal-poor giant candidates selected from the Hamburg/ESO objective-prism survey (HES) as well as the HK survey to identify sharp-lined stars with [Fe/H] < -2.5dex. For several hundred confirmed metal-poor giants brighter than B~16.5mag (most of them from the HES), ``snapshot'' spectra (R~20,000; S/N~30 per pixel) are being obtained with VLT/UVES, with the main aim of finding the 2-3% r-II stars expected to be a…

population II [stars]PhysicsAstrophysics (astro-ph)FOS: Physical sciencesabundances [Galaxy]Astronomy and AstrophysicsAstrophysicsStar (graph theory)AstrophysicsSpectral lineabundances [stars]Neutron captureStarssurveysSpace and Planetary SciencePhenomenological modelhalo [Galaxy]Astronomy Astrophysics and Cosmologyr-processSpectroscopyRadioactive decayAstronomy & Astrophysics
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