期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 824, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8205/824/2/L19
关键词
nuclear reactions, nucleosynthesis, abundances; stars: abundances; stars: individual (BD+44 493)
资金
- STScI [GO-14231]
- NASA [NAS5-26555]
- U.S. National Science Foundation (NSF) [PHY 14-30152]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1430152] Funding Source: National Science Foundation
The carbon-enhanced metal-poor star BD+ 44 degrees 493 ([Fe/H] = -3.9) has been proposed as a candidate second-generation star enriched by metals from a single Pop III star. We report the first detections of P and S and the second detection of Zn in any extremely metal-poor carbon-enhanced star, using new spectra of BD+ 44 degrees 493 collected by the Cosmic Origins Spectrograph on the Hubble Space Telescope. We derive [P/Fe] - -0.34 +/- 0.21, [S/Fe] = +0.07 +/- 0.41, and [Zn/Fe] = -0.10 +/- 0.24. We increase by 10-fold the number of Si I lines detected in BD+44 degrees 493, yielding [Si/Fe] = +0.15 +/- 0.22. The [S/Fe] and [Zn/Fe] ratios exclude the hypothesis that the abundance pattern in BD+44 degrees 493 results from depletion of refractory elements onto dust grains. Comparison with zero-metallicity supernova (SN) models suggests that the stellar progenitor that enriched BD+44 degrees 493 was massive and ejected much less than 0.07 M-circle dot of Ni-56, characteristic of a faint SN.
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