Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.1715s&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #17.15; Bulletin of the American Astronomical Society, Vol. 34, p.1129
Other
Scientific paper
We have obtained new high resolution spectra of several blue metal-poor (BMP) stars of the Galactic field halo population. Such stars lie on the main sequence but are 500-1000 K warmer than the position of the metal-poor turnoff; more than half of them are binaries (Preston & Sneden 2000, AJ, 120, 1014). Of our 10 BMP program stars, six are very metal-poor ([Fe/H] ~ --2.1). Of these six, three are known binaries, and three have constant radial velocities. Our abundance analysis reveals significant differences between the binaries and the non-variables: all of the binaries have substantial overabundances of carbon and heavy elements easily synthesized in slow neutron-capture nucleosynthesis (the s-process): <[C/Fe]> = +1.9, <[Sr/Fe]> = +1.1, and <[Ba/Fe]> = +1.4. No enhancements of these elements are seen in the constant velocity stars. Thus the BMP metal-poor binaries must have gained their peculiar abundances via mass transfer during the AGB phases of their companions, which now should be compact objects. One of the BMP binaries, CS 29497-030, exhibits a strong line of Pb I at 4057 Å. The derived [Pb/Fe] = +3.7 is the largest lead overabundance reported to date in s-process-enriched stars. The relative [Pb/(Ba or Sr)] abundance ratios are consistent with two other recently discovered very lead-rich stars (van Eck et al. 2001, Nature, 412, 793; Carretta et al. 2002, AJ, 124, 481). This research has been supported by NSF grants AST-9987162 to C.S. and AST-9986974 to J.J.C.
Cowan John J.
Preston George W.
Sneden Chistopher
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