2012ApJ...755L..18K

Query : 2012ApJ...755L..18K

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.

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

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 V* VX Scl RR* 01 35 23.6616795216 -35 07 42.603497976   12.22 12.01     A2 57 0
3 V* BE Eri RR* 04 38 03.4820818584 -01 59 45.016196604     13.34     ~ 21 0
4 V* U Lep RR* 04 56 17.9852660208 -21 13 02.024591448   10.76 10.64     A8/F2(I) 125 0
5 V* IV Leo RR* 10 58 12.5637650736 -00 05 40.377733692     15.72     ~ 20 0
6 V* LM Leo RR* 11 31 49.7166940488 -02 14 26.097803880     15.51     ~ 17 0
7 V* LO Leo RR* 11 35 22.7555820480 -00 53 42.640225188     15.47     ~ 18 0
8 V* LP Leo RR* 11 36 39.7966120344 -01 25 16.623039792     16.77     A0 18 0
9 V* V370 Vir RR* 12 06 04.1331590832 -02 12 57.381365664     15.23     ~ 23 0
10 V* V408 Vir RR* 12 40 03.5423919312 -00 04 09.568737012     16.99     F5 23 0
11 LINEAR 7593064 RR* 12 45 03.0450521904 -04 19 11.005463424     16.10     ~ 19 0
12 V* ZZ Vir RR* 13 23 38.6272643808 -04 21 41.990783004     14.27     A5hb 19 0
13 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
14 V* WY Vir RR* 13 35 16.1445222336 -06 58 22.579286412   13.72 13.46     A2 36 0
15 ATO J223.4946-11.8973 RR* 14 53 58.7197142808 -11 53 50.279138520   16.3 15.61     ~ 15 0
16 ATO J232.4713-05.8573 RR* 15 29 53.1204070296 -05 51 26.275281300     15.74     ~ 12 0
17 V* UY CrB RR* 16 06 21.7639663320 +28 07 03.841797432     13.00     ~ 28 0
18 ATO J256.8913+58.8499 RR* 17 07 33.9318852312 +58 50 59.711493732   16.209 15.635 15.977   F5kA2Bapec 35 0
19 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
20 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
21 HD 190916 * 20 05 38.6011535064 +41 16 47.456327316 7.83 7.95 7.61     A0Iab 28 0
22 V* KP Cyg RR* 20 05 40.7547821448 +41 15 45.047879100       12.600   F7 25 0
23 V* UY Cyg RR* 20 56 28.3030123896 +30 25 40.327229640   11.37 11.1     G 104 0
24 ATO J333.0472-16.5797 RR* 22 12 11.3366420784 -16 34 46.857799416     16.27     ~ 11 0
25 V* TY Gru RR* 22 16 39.4204602572 -39 56 17.947129636   14.64 14.10     ~ 44 0
26 ATO J355.8220+01.1741 RR* 23 43 17.2936531992 +01 10 27.033736368   17.7 16.885     ~ 23 0

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