Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.133..369l&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 133, no. 2, 1987, p. 369-381. Research supported by the Robert A. Welch Fo
Astronomy and Astrophysics
Astrophysics
6
Abundance, Red Giant Stars, Silicon Isotopes, Spectrum Analysis, Stellar Spectra, High Resolution, Spectral Line Width, Spectral Resolution, Stellar Spectrophotometry
Scientific paper
High-resolution spectra of Beta Peg, Omicron1 Ori, 10 Dra, and HR 1105 are analyzed in order to estimate Si-28/Si-29 and Si-28/Si-30 abundance ratios. The elimination of the Fourier Transform Spectrometer ripple, telluric N2O absorption, and the detector noise from the observations is discussed. The various methods used to derive the Si-28 and Si-29 abundance ratios are described. The equivalent and half widths of a number of strong and weak Si-28O lines, and the microturbulent and macroturbulent velocities of the Si-28O line are measured. The nucleosynthesis of Si-29 and Si-30 is examined. It is observed that the Si-28/Si-29 ratio is within 20 to 25 percent of the terrestrial ratio of 20 in Beta Peg and HR 1105, but that Si-29 is underabundant in 10 Dra and Omicron1 Ori; and Si-30 is underabundant in all four stars with respect to the terrestrial ratio of 30.
Lambert David L.
McWilliam Andrew
Smith Verne V.
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