Carbon-rich RR Lyr type stars

Details Carbon-rich RR Lyr type stars Carbon-rich RR Lyr type stars

2009-01-15

arxiv.org/abs/0901.2148v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

accepted for publication in ApJL

Scientific paper

10.1088/0004-637X/692/2/L127

We have derived CNO abundances in 12 RR Lyrae stars. Four stars show [C/Fe] near 0.0 and two stars show [C/Fe] = 0.52 and 0.65. Red giant branch stars, which are known to be the predecessors of RR Lyrae stars, generally show a deficiency of carbon due to proton captures during their evolution from the main sequence up the giant branch. We suggest that the enhancement of carbon is due to production during the helium flash combined with mixing to the surface by vigorous convection induced by the flash itself.

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