Isotopic abundances of silicon in four red giants |
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| Authors: | David L Lambert Andrew McWilliam Verne V Smith |
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| Institution: | (1) Department of Astronomy, University of Texas, Austin, Texas, U.S.A. |
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| Abstract: | High-resolution spectra near 4  m of the four red giants— Peg,o
1 Ori, 10 Dra, and HR 1105—have been analysed to obtain estimates of the28Si/29Si and28Si/30Si abundance ratios. For Peg and the S star HR 1105, the28Si/29Si ratio is close to the solar ratio (28Si/29Si=20).29Si appears to be underabundant in the MS staro
1 Ori (28Si/29Si=40) and the M star 10 Dra (28Si/29Si 53). The30Si isotope appears to be underabundant by, perhaps, about a factor of 2 in all four stars. |
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