Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542522n&link_type=abstract
American Astronomical Society, AAS Meeting #215, #425.22; Bulletin of the American Astronomical Society, Vol. 42, p.339
Astronomy and Astrophysics
Astrophysics
Scientific paper
We report on a near-IR study of the abundance of yttrium in the cool, luminous stars α Ori (M2 Iab), RX Boo (M7.5), TX Psc (C6.2) and χ Cyg (S7.1). Yttrium can be produced in the weak s-process in massive stars and is an important component of the main s-process in AGB stars. As a result, the yttrium abundance can provide insight into the nucleosynthesis processes in the advanced stages of both massive and solar-mass stars. Although the near-IR is especially well suited to the spectroscopic study of cool stars, previous abundance studies have been limited by the lack of atomic data. We have obtained laboratory atomic data for several lines in the Y I spectrum in this region. Using these data, more accurate abundance estimates have been obtained. We compare the new lab results with astrophysical gf-values we obtain from the spectrum of the Sun, α Boo (K0 Ib), and HD61913 (M3 II/III).
Blackwell-Whitehead Richard
Norris Ryan P.
Wahlgren Glenn Michael
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