Are the red supergiants Epsilon Peg and 12 PUP victims of mild s-processing?

Details Are the red supergiants Epsilon Peg and 12 PUP victims of mild s-processing? Are the red supergiants Epsilon Peg and 12 PUP victims of mild s-processing?

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..563s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, June 1, 1987, p. 563-579. Research supported by th

Other

26

Abundance, Metallicity, Nuclear Reactions, Red Giant Stars, Stellar Atmospheres, Stellar Spectra, Supergiant Stars, Barium, G Stars, K Stars, Line Spectra, Stellar Envelopes, Stellar Evolution, Strontium

Scientific paper

An abundance analysis of eight G and K supergiants has been performed with particular emphasis on two stars, Epsilon Peg and 12 Pup. It has been reported (Kovacs, 1983) that these two stars exhibit selective enhancement of Ba and, in the case of 12 Pup, Sr. Such a pattern of abundance enhancement would occur for very mild s-processing followed by extensive pollution of the star's outer envelope with this processed material. This type of mixing is not predicted by current models of stellar evolution. The previous Ba and Sr abundances were based on very strong lines of Ba II and Sr II and such lines are sensitive to microturbulence and conditions in the higher layers of the stellar atmosphere. This analysis compares the Ba II and Sr II line-strengths in Epsilon Peg and 12 Pup with six other cool supergiants and also utilizes weak Ba I and Sr I lines seen in the spectra of these stars. No enhancements of Ba or Sr, relative to the other supergiants, are found for Epsilon Peg or 12 Pup. In addition, calculations of the abundances produced by mild s-processing followed by extensive mixing with the outer envelope show that Co and Sc should also be enhanced substantially. Such enhancements are not observed in any of the supergiants.

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