A New Exploration of the Spectrum of CS 22892-052

Details A New Exploration of the Spectrum of CS 22892-052 A New Exploration of the Spectrum of CS 22892-052

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4512s&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #45.12; Bulletin of the American Astronomical Society, Vol. 30, p.1319

Astronomy and Astrophysics

Astronomy

1

Scientific paper

New high resolution, high signal-to-noise spectra of the ultra-metal-poor, neutron-capture-rich halo giant CS 22892-052 have been obtained with the Keck I 10m and McDonald 2.7m telescopes. The Keck spectra cover the near-UV spectral region (3100--4300 Angstroms) and the McDonald spectra are most useful in the yellow-red region (5000--9000 Angstroms). We have analyzed many new near-UV lines of previously studied neutron-capture elements (such as Y, Zr, Nd, and Dy) in CS 22892-052. These new transitions are used to increase the reliability of the abundances of those elements and to show that abundances deduced from near-UV features are the same as those from the visible spectral region. More importantly, with the new spectra we have identified transitions of several previously undetected neutron-capture elements in the range 41<=Z<=48 (especially Pd, Ag, and Cd), and elements of the third neutron-capture peak (Os, Ir, and Pt). We also detect, for the first time in metal-poor stars, a second line of Th II at 4086 Angstroms. The Th abundance deduced from this line is consistent with that obtained from the ``standard'' 4019 Angstroms Th II line, increasing the confidence in the use of the Th as a cosmochronometer.

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