2014ApJ...787....6K


Query : 2014ApJ...787....6K

2014ApJ...787....6K - Astrophys. J., 787, 6 (2014/May-3)

Seven new carbon-enhanced metal-poor RR Lyrae stars.

KENNEDY C.R., STANCLIFFE R.J., KUEHN C., BEERS T.C., KINMAN T.D., PLACCO V.M., REGGIANI H., ROSSI S. and LEE Y.S.

Abstract (from CDS):

We report estimated carbon-abundance ratios, [C/Fe], for seven newly discovered carbon-enhanced metal-poor (CEMP) RR Lyrae stars. These are well-studied RRab stars that had previously been selected as CEMP candidates based on low-resolution spectra. For this pilot study, we observed eight of these CEMP RR Lyrae candidates with the Wide Field Spectrograph on the ANU 2.3 m telescope. Prior to this study, only two CEMP RR Lyrae stars had been discovered: TY Gru and SDSS J1707+58. We compare our abundances to new theoretical models of the evolution of low-mass stars in binary systems. These simulations evolve the secondary stars, post accretion from an asymptotic giant-branch (AGB) donor, all the way to the RR Lyrae stage. The abundances of CEMP RR Lyrae stars can be used as direct probes of the nature of the donor star, such as its mass, and the amount of material accreted onto the secondary. We find that the majority of the sample of CEMP RR Lyrae stars is consistent with AGB donor masses of around 1.5-2.0 M and accretion masses of a few hundredths of a solar mass. Future high-resolution studies of these newly discovered CEMP RR Lyrae stars will help disentangle the effects of the proposed mixing processes that occur in such objects.

Abstract Copyright:

Journal keyword(s): Galaxy: halo - stars: abundances - stars: variables: RR Lyrae - techniques: spectroscopic

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* IV Leo RR* 10 58 12.5637650736 -00 05 40.377733692     15.72     ~ 14 0
2 V* LO Leo RR* 11 35 22.7555820480 -00 53 42.640225188     15.47     ~ 12 0
3 V* LP Leo RR* 11 36 39.7966120344 -01 25 16.623039792     16.77     ~ 13 0
4 V* V370 Vir RR* 12 06 04.1331590832 -02 12 57.381365664     15.23     ~ 16 0
5 V* V408 Vir RR* 12 40 03.5423919312 -00 04 09.568737012     16.99     ~ 15 0
6 LINEAR 7593064 RR* 12 45 03.0450521904 -04 19 11.005463424     16.10     ~ 12 0
7 V* ZZ Vir RR* 13 23 38.6272643808 -04 21 41.990783004     14.27     A5hb 11 0
8 V* WY Vir RR* 13 35 16.1445222336 -06 58 22.579286412   13.72 13.46     A2 25 0
9 ATO J256.8913+58.8499 RR* 17 07 33.9318852312 +58 50 59.711493732   16.209 15.635 15.977   F5kA2Bapec 25 0
10 V* TY Gru RR* 22 16 39.4204602572 -39 56 17.947129636   14.64 14.10     ~ 35 0

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2022.11.26-10:12:47

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