SIMBAD references

2012ApJ...755L..18K - Astrophys. J., 755, L18 (2012/August-2)

A new CEMP-s RR Lyrae star.

KINMAN T.D., AOKI W., BEERS T.C. and BROWN W.R.

Abstract (from CDS):

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 turnoff 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.

Abstract Copyright:

Journal keyword(s): Galaxy: structure - stars: abundances - stars: horizontal-branch

Simbad objects: 26

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2022.10.04-11:06:58

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