2006ApJ...640L..43S

Query : 2006ApJ...640L..43S

2006ApJ...640L..43S - Astrophys. J., 640, L43-L46 (2006/March-3)

New metallicities of RR Lyrae stars in ω Centauri: evidence for a non-He-enhanced metal-intermediate population.

SOLLIMA A., BORISSOVA J., CATELAN M., SMITH H.A., MINNITI D., CACCIARI C. and FERRARO F.R.

Abstract (from CDS):

We present new spectroscopic metal abundances for 74 RR Lyrae (RRL) stars in ω Cen obtained with FLAMES. The well-known metallicity spread is visible among the RRL variables. The metal-intermediate (MI) RRL stars ([Fe/H]~-1.2) are fainter than the bulk of the dominant metal-poor population ([Fe/H]~-1.7), in good agreement with the corresponding zero-age horizontal-branch models with cosmological helium abundance Y=0.246. This result conflicts with the hypothesis that the progenitors of the MI RRL stars correspond to the anomalous blue main-sequence stars, which share a similar metallicity but whose properties are currently explained by assuming for them a large helium enhancement. Therefore, in this scenario, the coexistence within the cluster of two different populations with similar metallicities ([Fe/H]~-1.2) and different helium abundances has to be considered.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Globular Clusters: Individual: Name: ω Centauri - Stars: Abundances - Stars: Population II - Techniques: Spectroscopic

VizieR on-line data: <Available at CDS (J/ApJ/640/L43): table1.dat>

CDS comments: Table 1: RR Lyrae stars are 'Cl* NGC 5139 SAW VNNN' in SIMBAD.

Simbad objects: 77

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Number of rows : 77
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 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
2 Cl* NGC 5139 B V33 RR* 13 25 51.5641162584 -47 29 06.100757484 14.752 15.159 14.639 14.693 13.893 hF2.5 30 0
3 Cl* NGC 5139 B V58 RR* 13 26 13.0335144720 -47 24 03.437361000 15.088 14.841 14.444 14.331 13.961 ~ 25 0
4 Cl* NGC 5139 SAW V263 RR* 13 26 13.1095773720 -47 26 10.201259508 14.803 14.790 14.325 14.028 13.553 ~ 16 0
5 Cl* NGC 5139 BPB 168094 RR* 13 26 15.9152960904 -47 29 56.516389980 15.010 14.721 14.598 14.160 13.968 ~ 22 0
6 Cl* NGC 5139 LEID 46061 RR* 13 26 17.7504601976 -47 30 23.967846637 15.009 14.851 14.598 14.414 14.112 ~ 11 0
7 Cl* NGC 5139 B V5 RR* 13 26 18.3134980776 -47 23 12.822068580 15.546 14.979 14.784 14.546 14.234 hF5.5 32 0
8 Cl* NGC 5139 B V44 RR* 13 26 22.3779042960 -47 34 35.714609724 15.297 15.585 14.872 14.398 14.183 hF4 31 0
9 Cl* NGC 5139 B V54 RR* 13 26 23.4999960336 -47 18 48.094551756 14.918 15.228 14.42   13.748 ~ 36 0
10 Cl* NGC 5139 B V26 RR* 13 26 23.6086031304 -47 26 59.820007272 15.152 15.203 14.594 14.205 13.803 ~ 25 0
11 Cl* NGC 5139 B V40 RR* 13 26 24.5445116038 -47 30 46.652927754 14.850 15.207 14.648 14.261 13.851 ~ 27 0
12 Cl* NGC 5139 B V120 RR* 13 26 25.5119477309 -47 32 49.059034911 15.510 15.473 15.031 14.535 14.248 ~ 30 0
13 Cl* NGC 5139 B V27 RR* 13 26 26.0144508480 -47 28 17.020304004 15.166 15.284 14.761 14.636 14.035 ~ 32 0
14 Cl* NGC 5139 B V15 RR* 13 26 27.0765625992 -47 24 38.390605272 15.199 14.512 14.430 14.141 13.680 ~ 29 0
15 Cl* NGC 5139 BPB 181199 RR* 13 26 28.0632964031 -47 29 18.328714582 14.901 15.086 14.269   13.757 ~ 13 0
16 Cl* NGC 5139 B V121 RR* 13 26 28.1561141352 -47 31 50.986766928 15.040 14.951 14.641 14.382 14.118 ~ 25 0
17 Cl* NGC 5139 B V67 RR* 13 26 28.5605456616 -47 18 47.206425312 15.426 14.785 14.68 14.228 14.052 hF5.5 34 0
18 Cl* NGC 5139 SAW V399 RR* 13 26 29.5150843959 -47 30 03.020289270 15.046 14.830 14.620 14.546 14.107 ~ 10 0
19 Cl* NGC 5139 BPB 173358 RR* 13 26 30.0388996848 -47 29 41.250025464 15.012 14.972 14.444 14.422 13.971 ~ 22 0
20 Cl* NGC 5139 SAW V265 RR* 13 26 30.1916183688 -47 28 45.726382092 15.037 14.752 14.591 14.182 13.916 ~ 13 0
21 Cl* NGC 5139 B V122 RR* 13 26 30.3021634362 -47 33 02.556810167 15.103 15.173 14.596 14.403 13.920 ~ 31 0
22 Cl* NGC 5139 B V11 RR* 13 26 30.5417349984 -47 23 01.908351204 15.174 14.734 14.438 14.295 13.906 ~ 23 0
23 Cl* NGC 5139 SAW V136 RR* 13 26 31.0638722952 -47 27 40.906004868 15.121 14.729 14.437 14.304 13.898 ~ 19 0
24 Cl* NGC 5139 BPB 243048 RR* 13 26 35.1115192025 -47 26 11.126978884 15.095 15.144 14.361 14.152 13.737 ~ 21 0
25 Cl* NGC 5139 BPB 204728 RR* 13 26 35.471 -47 28 07.18 15.303 15.235 14.506 14.245 13.807 ~ 23 0
26 Cl* NGC 5139 BPB 215311 RR* 13 26 37.721 -47 27 35.43 14.953 14.770 14.767 14.090 13.853 ~ 24 0
27 Cl* NGC 5139 BPB 271739 RR* 13 26 38.0313981141 -47 24 44.884741583 15.047 14.862 14.588 14.403 14.102 ~ 10 0
28 Cl* NGC 5139 SAW V354 RR* 13 26 38.5789632053 -47 25 10.201442076 15.127 14.785 14.601 14.247 13.978 ~ 10 0
29 Cl* NGC 5139 SAW V267 RR* 13 26 40.1861905728 -47 26 36.032838072 14.964 14.881 14.615 14.472 14.076 ~ 16 0
30 Cl* NGC 5139 B V118 RR* 13 26 40.5374773272 -47 30 19.311582456 14.875 15.243 14.765 14.326 13.802 ~ 28 0
31 Cl* NGC 5139 SAW V141 RR* 13 26 40.8697800912 -47 29 28.291982028 15.109 15.012 14.669 14.350 13.893 ~ 14 0
32 Cl* NGC 5139 SAW V366 RR* 13 26 41.5494669120 -47 31 42.272650128 14.531 14.626 13.990 13.767 13.323 ~ 10 0
33 Cl* NGC 5139 SAW V140 RR* 13 26 42.15 -47 30 07.5   14.807 14.463     ~ 9 0
34 NGC 5139 5154 RR* 13 26 42.5844776784 -47 24 21.592771200 15.215 14.273 14.603   13.832 ~ 30 0
35 Cl* NGC 5139 SAW V142 RR* 13 26 42.6344785080 -47 28 42.943604520 15.415 15.137 14.635   14.103 ~ 8 0
36 Cl* NGC 5139 SAW V353 RR* 13 26 43.7753592479 -47 27 56.858357745 15.030 15.021 14.520   13.889 ~ 9 0
37 Cl* NGC 5139 BPB 154754 RR* 13 26 45.3135057408 -47 30 37.386355751 15.484 15.342 14.389   13.46 ~ 20 0
38 Cl* NGC 5139 B V90 RR* 13 26 45.766 -47 26 22.28 15.906 15.671 14.791 14.199 13.689 ~ 28 0
39 Cl* NGC 5139 B V89 RR* 13 26 45.9571562188 -47 26 01.122161736   15.010 14.590     ~ 21 0
40 Cl* NGC 5139 SAW V23 RR* 13 26 46.4801502769 -47 24 39.578633630 15.237 15.558 14.851 14.605 14.247 ~ 26 0
41 Cl* NGC 5139 BPB 202477 RR* 13 26 46.9142759680 -47 28 14.416666732 15.070 14.713 14.653 14.209 13.994 ~ 10 0
42 Cl* NGC 5139 SAW V271 RR* 13 26 47.1010668624 -47 30 04.244826096 14.981 14.773 14.466 14.285 13.862 ~ 13 0
43 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
44 Cl* NGC 5139 NJL 34 RR* 13 26 47.8774296576 -47 31 52.567093560 15.129 14.890 14.528 14.442 14.017 ~ 16 0
45 Cl* NGC 5139 B V125 RR* 13 26 48.9756813816 -47 41 03.660631656   15.359 14.850 14.302 14.062 hF5 32 0
46 Cl* NGC 5139 B V111 RR* 13 26 49.0906272981 -47 28 38.524566124 14.957 15.230 14.449 14.164 13.732 ~ 24 0
47 Cl* NGC 5139 BPB 214740 RR* 13 26 49.7218581889 -47 27 37.519668386 15.055 14.959 14.666 14.253 14.016 ~ 13 0
48 Cl* NGC 5139 B V114 RR* 13 26 50.14 -47 30 21.8 15.242 15.121 14.873 14.424 14.006 ~ 18 0
49 Cl* NGC 5139 BPB 241579 RR* 13 26 50.5776040416 -47 26 15.810656568 15.039 14.759 14.426 14.029 13.644 ~ 19 0
50 Cl* NGC 5139 NJL 24 RR* 13 26 53.2448584128 -47 22 34.908812652 14.940 14.991 14.521 14.387 13.959 ~ 24 0
51 Cl* NGC 5139 LEID 43348 RR* 13 26 54.6381003840 -47 28 48.358383816 15.125 14.835 14.649 14.277 14.088 ~ 12 0
52 Cl* NGC 5139 BPB 149574 RR* 13 26 56.3729392281 -47 30 50.578079653 15.172 15.016 14.622 14.442 14.123 ~ 12 0
53 Cl* NGC 5139 BPB 202932 RR* 13 26 59.1667773050 -47 28 12.894558350 15.143 14.989 14.639 14.499 13.915 ~ 17 0
54 Cl* NGC 5139 B V109 RR* 13 27 01.5330413976 -47 29 36.968783604 15.126 15.071 14.578 14.396 13.923 ~ 25 0
55 Cl* NGC 5139 B V110 RR* 13 27 02.0500926552 -47 30 07.051594068 15.165 15.262 14.581 14.585 14.164 ~ 14 0
56 Cl* NGC 5139 B V99 RR* 13 27 02.1399484842 -47 27 49.250412594 14.971 14.945 14.382 13.844 13.728 ~ 27 0
57 Cl* NGC 5139 SAW V154 RR* 13 27 03.1192047960 -47 30 33.084793656 15.042 14.877 14.583 14.395 14.064 ~ 12 0
58 Cl* NGC 5139 B V38 RR* 13 27 03.2376906168 -47 36 30.492685944 15.039 14.765 14.567 14.150 13.791 hF6 30 0
59 Cl* NGC 5139 BPB 178628 RR* 13 27 04.6748776399 -47 29 26.093841629 14.942 15.303 14.747 14.345 13.776 ~ 23 0
60 Cl* NGC 5139 BPB 209884 RR* 13 27 08.0590342882 -47 27 52.131661491 15.012 15.113 14.721 14.240 14.054 ~ 22 0
61 Cl* NGC 5139 NJL 9 RR* 13 27 08.4892885152 -47 25 31.350755748 15.007 14.661 14.424 14.137 13.792 ~ 29 0
62 Cl* NGC 5139 NJL 16 RR* 13 27 14.0388331656 -47 28 06.824946252 15.046 15.114 14.920 14.336 14.015 ~ 26 0
63 Cl* NGC 5139 B V103 RR* 13 27 14.2709566036 -47 28 36.777127032 14.878 14.814 14.630 14.240 14.017 ~ 18 0
64 Cl* NGC 5139 NJL 7 RR* 13 27 15.1738666104 -47 26 11.579704332 14.986 15.001 14.802 14.240 13.996 ~ 26 0
65 Cl* NGC 5139 SAW V261 RR* 13 27 15.4051082377 -47 21 29.902634162 14.989 14.973 14.537 14.203 13.837 ~ 14 0
66 NGC 5139 4060 RR* 13 27 18.6756530832 -47 28 23.452595868 15.113 14.933 14.657 14.354 14.127 ~ 14 0
67 Cl* NGC 5139 B V75 RR* 13 27 19.6922315400 -47 18 46.965557556 14.856 14.734 14.439 14.071 13.823 ~ 29 0
68 Cl* NGC 5139 SAW V169 RR* 13 27 20.4578210784 -47 23 59.540061048 15.204 14.823 14.613 14.374 14.123 ~ 19 0
69 Cl* NGC 5139 NJL 39 RR* 13 27 20.8712071248 -47 22 06.010128372 15.091 14.967 14.540 14.258 13.896 hF3 31 0
70 Cl* NGC 5139 NJL 8 RR* 13 27 22.0939844472 -47 30 12.854888820 15.064 14.729 14.637 14.146 13.832 ~ 31 0
71 Cl* NGC 5139 NJL 43 RR* 13 27 27.7542843528 -47 33 43.218436824 15.051 14.748 14.716 14.126 13.979 hF6.5 29 0
72 Cl* NGC 5139 B V82 RR* 13 27 35.5869665496 -47 26 30.792779556 14.995 14.958 14.552 14.469 14.011 ~ 27 0
73 Cl* NGC 5139 NJL 4 RR* 13 27 36.6434088120 -47 24 48.742857684 15.050 14.797 14.631 14.286 13.985 ~ 31 0
74 Cl* NGC 5139 B V16 RR* 13 27 37.7112002568 -47 37 35.108877360   14.977 14.545 14.477 14.124 hF7 27 0
75 Cl* NGC 5139 B V22 RR* 13 27 41.0525212248 -47 34 08.050252044 15.010 14.978 14.552 14.313 13.976 hF2.5 29 0
76 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
77 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0

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