The r-Process Enriched Low Metallicity Giant HD 115444

Details The r-Process Enriched Low Metallicity Giant HD 115444 The r-Process Enriched Low Metallicity Giant HD 115444

1999-10-20

arxiv.org/abs/astro-ph/9910376v1

Astrophys.J.530:783-799,2000

Astronomy and Astrophysics

Astrophysics

To Appear in the Astrophysical Journal

Scientific paper

10.1086/308407

New high resolution, very high signal-to-noise spectra of ultra-metal-poor (UMP) giant stars HD 115444 and HD 122563 have been gathered with the High-Resolution Echelle Spectrometer of the McDonald Observatory 2.7m Telescope. With these spectra, line identification and model atmosphere analyses have been conducted, emphasizing the neutron-capture elements. Twenty elements with Z > 30 have been identified in the spectrum of HD 115444. This star is known to have overabundances of the neutron-capture elements, but it has lacked a detailed analysis necessary to compare with nucleosynthesis predictions. The new study features a line-by-line differential abundance comparison of HD 115444 with the bright, well-studied halo giant HD 122563. For HD 115444, the overall metallicity is [Fe/H]~ -3.0. The abundances of the light and iron-peak elements generally show the same pattern as other UMP stars (e.g. overdeficiencies of manganese and chromium, overabundances of cobalt), but the differential analysis indicates several nucleosynthesis signatures that are unique to each star.

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