Constraints on Super/Hypernova Nucleosynthesis from the Hyper-Runaway Star HD271791

Details Constraints on Super/Hypernova Nucleosynthesis from the Hyper-Runaway Star HD271791 Constraints on Super/Hypernova Nucleosynthesis from the Hyper-Runaway Star HD271791

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12222p&link_type=abstract

HST Proposal ID #12222. Cycle 18

Computer Science

Scientific paper

HD271791 is an extreme run-away star of B-type travelling so fast that it is likely to leave the Galaxy. We have shown that this star was ejected from the metal-poor outer rim of the Galaxy in a binary super- or hypernova. The star provides a unique opporotunity to study the chemical composition of SN/HN ejecta, because nuclear-processed debris was deposited onto its surface in the course of the explosion. From optical spectra we have already demonstrated that the signature of the explosion is visible in its atmospheric abundance pattern, because the alpha-elements are enhanced. Our aim is to derive abundances for a large number of chemical elements, which are accessible only in the UV spectral range, to constrain the nucleosynthesis in the SN/HN in detail. If we succeed to detect tale-telling signatures of r-process elements in the UV spectrum, we may finally pin down the long-sought site of the r-process.;

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