Subgiant CH stars. I - s-Process abundances, C/O ratios, and evolutionary status

Details Subgiant CH stars. I - s-Process abundances, C/O ratios, and evolutionary status Subgiant CH stars. I - s-Process abundances, C/O ratios, and evolutionary status

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259..792l&link_type=abstract

Astrophysical Journal, Part 1, vol. 259, Aug. 15, 1982, p. 792-804.

Astronomy and Astrophysics

Astronomy

86

Abundance, Carbon Stars, Oxygen, Stellar Evolution, Subgiant Stars, B Stars, Binary Stars, Capture Effect, Infrared Astronomy, Late Stars, Neutrons, Nuclear Fusion, Red Giant Stars, Spectral Line Width, Stellar Magnitude, Stellar Models

Scientific paper

Abundance analyses of seven relatively bright subgiant CH stars are presented and compared with a new analysis of the red-giant CH star HD 26, based on data from Palomar and Mount Wilson photographic coude spectrograms in the blue spectral region and Mount Wilson coude scans in the red region. Results show that all of the stars are mildly metal-deficient (Fe/H ratio ranging from -0.2 to -0.5), the surface gravities indicate visual absolute magnitudes of plus 2 to plus 5, and all of the stars show enhanced strontium-peak abundances, although the barium-peak enhancements are found to vary from star to star, indicating a considerable range in the s-process neutron exposures. For five subgiant CH stars analyzed for carbon and oxygen abundances, all are found to be true carbon stars with C/O ratios greater than one. It is proposed that these low-luminosity CH stars originated either as a result of mass transfer from a carbon-star binary companion that is now an invisible white dwarf, or as the consequence of violent internal mixing at the helium core flash that returned the star to the vicinity of the main sequence. However, the fact that subgiant CH stars seem to exist only around type G0 supports only the latter hypothesis.

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