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arxiv: 1207.1505 · v1 · pith:KHD4ANGVnew · submitted 2012-07-06 · 🌌 astro-ph.GA

A New CEMP-s RR Lyrae Star

T. D. Kinman (1) , W. Aoki (2) , T. C. Beers (1) , W.R. Brown (3) ((1) National Optical Astronomy Observatory , Tucson , AZ , USA , (2) National Astronomical Observatory of Japan
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Tokyo Japan (3) Smithsonian Astrophysical Observatory Cambridge MA USA)
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classification 🌌 astro-ph.GA
keywords starslyraestarcemp-ssdssidentifiedj1707known
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We show that SDSS J170733.93+585059.7 (hereafter SDSS J1707+58), previously identified by Aoki and collaborators as a carbon-enhanced metal-poor star (with s-process-element enhancements; CEMP-s), on the assumption that it is a main-sequence turn-off star, is the RR Lyrae star VIII-14 identified by the Lick Astrograph Survey. Revised abundances for SDSS J1707+58 are [Fe/H] = -2.92, [C/Fe] = +2.79, and [Ba/Fe] = +2.83. It is thus one of the most metal-poor RR Lyrae stars known, and has more extreme [C/Fe] and [Ba/Fe] than the only other RR Lyrae star known to have a CEMP-s spectrum (TY Gru). Both stars are Oosterhoff II stars with prograde kinematics, in contrast to stars with [C/Fe] < +0.7, such as KP Cyg and UY CrB, which are disk stars. Twelve other RR Lyrae stars with [C/Fe] >= +0.7 are presented as CEMP candidates for further study.

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