A spectroscopic study of CI Cygni - The s-process episode

Details A spectroscopic study of CI Cygni - The s-process episode A spectroscopic study of CI Cygni - The s-process episode

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....93....1a&link_type=abstract

Astronomy and Astrophysics, vol. 93, no. 1-2, Jan. 1981, p. 1-7.

Astronomy and Astrophysics

Astrophysics

8

Nuclear Fusion, Stellar Evolution, Stellar Spectra, Stellar Structure, Variable Stars, Absorption Spectra, Line Spectra, Metallic Stars, Radial Velocity, Spectroscopic Analysis, Stellar Interiors

Scientific paper

An analysis of three 1975 plates of the variable star CI Cygni indicate very rapid cooling, quick expansion of the envelope, and an increase of the absorption lines due to s-process elements (especially the rare earths). These peculiar spectroscopic characteristics of CI Cygni show that the s-process nucleosynthesis takes place in stellar interiors; the observations may be used to confirm models such as that of Despain (1977) where neutron captures may occur in deeply mixed convective envelopes with base temperatures greater than 2 x 10 to the 8th K.

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