The Century-old R-Star Mystery

Details The Century-old R-Star Mystery The Century-old R-Star Mystery

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..948...51i&link_type=abstract

UNSOLVED PROBLEMS IN STELLAR PHYSICS: A Conference in Honor of Douglas Gough. AIP Conference Proceedings, Volume 948, pp. 51-55

Physics

Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Giant And Subgiant Stars, Carbon Stars, S Stars, And Related Types, Binary And Multiple Stars

Scientific paper

The R stars are carbon-rich K-type giants. For more than a century their origin has remained a mystery. The warmest of them, the early-R stars, have luminosities similar to core helium burning stars yet canonical stellar evolution theory suggests they should not be carbon rich. The early-R stars are chemically peculiar, being enhanced in 12C, 13C and 14N but not in s-process elements, and are all single stars. Binary mergers have been suggested as the evolutionary channel which leads to the early-R stars: we test this scenario with a state-of-the-art binary population synthesis.

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