Anna Frebel University of Texas at Austin

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Presentation transcript:

Anna Frebel University of Texas at Austin anna@astro.as.utexas.edu Abundance analysis of bright metal-poor stars from the Hamburg/ESO survey or The oldest stars in the Galaxy Anna Frebel University of Texas at Austin anna@astro.as.utexas.edu

Spectral Comparison [Fe/H]=0 [Fe/H]=-4 [Fe/H]=-5.3 Pop III star (just noise…?!?) Christlieb 2003

Three Observational Steps to Find Metal-Poor Stars Sample selection and visual inspection: Find appropriate candidates 2. Follow-up spectroscopy (medium resolution): Derive estimate for [Fe/H] from the Ca II K line 3. High-resolution spectroscopy: Detailed abundances analysis Frebel et al. 2005b

Abundances of HE 1523−0901 Frebel et al. (2007), in prep.

r-Process Enhanced Stars (rapid neutron-capture process) Responsible for the production of heavy elements ~5% among metal-poor stars with [Fe/H] <  2.5 => Only ~12 stars known so far with [r/Fe] > 1.0 Chemical “fingerprint” of previous nucleosynthesis event Possible production sites: SN type II, neutrino-driven winds Nucleo-chronometry: with Th, U and stable r-process elements (Eu, Os, Ir)

Frebel et al. (2007), ApJL submitted U II at 3859Å Frebel et al. (2007), ApJL submitted

The r-Process Pattern scaled solar r-process pattern HE 1523-0901

The Age of HE 1523−0901 Age: Th/Eu 11.5 ±4.7 Th/Os 10.7 ±4.7 Th/Ir Ratio Age Th/Eu 11.5 ±4.7 Th/Os 10.7 ±4.7 Th/Ir 15.0 ±4.7 U/Eu 13.2 ±2.2 U/Os 12.9 ±2.2 U/Ir 14.1 ±2.2 U/Th 13.0 ±3.3 average 13.2±1.1±2.0 Gyr Age: