Lithium and barium in RCrB and XX Cam

Details Lithium and barium in RCrB and XX Cam Lithium and barium in RCrB and XX Cam

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107...93h&link_type=abstract

Astronomy and Astrophysics, vol. 107, no. 1, Mar. 1982, p. 93-96.

Astronomy and Astrophysics

Astrophysics

9

B Stars, Barium, Lithium, Particle Acceleration, Spectrum Analysis, Stellar Evolution, Stellar Spectra, Abundance, Nucleogenesis, Spectral Line Width, Stellar Atmospheres, Stellar Models, Stellar Temperature

Scientific paper

Coude-spectrograms with a dispersion of 9 A/mm are fine analyzed for lithium and barium. Lithium is found to be slightly overabundant with respect to the value in RCrB (plus 0.5 plus or minus 0.4 dex), and deficient in XX Cam (less than minus 1.1 dex), while barium is overabundant in both stars. The occurrence of Li in RCrB and the absence of it in XX Cam suggests that a mechanism is working in the atmosphere of active RCrB stars, which accelerates particles to energies above 1 MeV. The overabundance of barium in the two stars indicates dredge-up phenomena and nucleogenesis which may have taken place in a previous phase of evolution.

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