2009ApJ...692L.127W

Query : 2009ApJ...692L.127W

2009ApJ...692L.127W - Astrophys. J., 692, L127-L129 (2009/February-3)

Carbon-rich RR Lyrae type stars.

WALLERSTEIN G., KOVTYUKH V.V. and ANDRIEVSKY S.M.

Abstract (from CDS):

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 Lyr 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.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: evolution - stars: horizontal-branch - stars: Population II

Simbad objects: 16

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Number of rows : 16
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 V* SW And RR* 00 23 43.0896315888 +29 24 03.626531352 9.53 9.34 9.15     A7IIImF0 270 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
3 V* XZ Cet RR* 02 00 16.6337784768 -16 20 46.035996360   9.81 9.49 9.34 9.241 A1w 83 0
4 V* SU Dra RR* 11 37 56.6071282968 +67 19 47.060102316 9.52 9.37 9.27     kA2.5hA9.5 264 0
5 V* UY Boo RR* 13 58 46.3367502960 +12 57 06.457864896   11.18 10.81     kA0hA8 137 0
6 V* RS Boo RR* 14 33 33.2132344464 +31 45 16.614367848 9.94 9.83 9.73     kF3hF6.5 201 0
7 V* VY Ser RR* 15 31 01.9269312402 +01 41 01.762136979 10.07 9.97 9.73     A5/7Ib/II 195 0
8 V* AN Ser RR* 15 53 31.0531421656 +12 57 40.112740009   11.32 10.93     kA7hA8.5 143 0
9 V* UY CrB RR* 16 06 21.7639663320 +28 07 03.841797432     13.00     ~ 28 0
10 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
11 V* V486 Her RR* 17 26 38.3674896384 +26 56 17.725786512     13.05 13.33 12.25 ~ 21 0
12 V* OX Her RR* 18 03 26.3750796240 +38 41 41.109647172   13.25 13.09     kA4hA8 23 0
13 V* RR Lyr RR* 19 25 27.9129605304 +42 47 03.693258204   7.36   7.6   kA3hF0 951 0
14 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
15 V* KP Cyg RR* 20 05 40.7547821448 +41 15 45.047879100       12.600   F7 25 0
16 V* TY Gru RR* 22 16 39.4204602572 -39 56 17.947129636   14.64 14.10     ~ 44 0

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