2011A&A...526A.136M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:20:01

2011A&A...526A.136M - Astronomy and Astrophysics, volume 526A, 136-136 (2011/2-1)

The hot horizontal-branch stars in ω Centauri.

MOEHLER S., DREIZLER S., LANZ T., BONO G., SWEIGART A.V., CALAMIDA A. and NONINO M.

Abstract (from CDS):

UV observations of some massive globular clusters have revealed a significant population of stars hotter and fainter than the hot end of the horizontal branch (HB), the so-called blue hook stars. This feature might be explained either by the late hot flasher scenario where stars experience the helium flash while on the white dwarf cooling curve or by the progeny of the helium-enriched sub-population postulated to exist in some clusters. Previous spectroscopic analyses of blue hook stars in ω Cen and NGC2808 support the late hot flasher scenario, but the stars contain much less helium than expected and the predicted C and N enrichment cannot be verified. We compare the observed effective temperatures, surface gravities, helium abundances, and carbon line strengths (where detectable) of our targets stars with the predictions of the two aforementioned scenarios. Moderately high resolution spectra of hot HB stars in the globular cluster ω Cen were analysed for radial velocity variations, atmospheric parameters, and abundances using LTE and non-LTE model atmospheres. We find no evidence of close binaries among our target stars. All stars below 30000K are helium-poor and very similar to HB stars observed in that temperature range in other globular clusters. In the temperature range 30000K to 50000K, we find that 28% of our stars are helium-poor (log(nHe)/(nH)←1.6), while 72% have roughly solar or super-solar helium abundance (log(nHe)/(nH)≥-1.5). We also find that carbon enrichment is strongly correlated with helium enrichment, with a maximum carbon enrichment of 3% by mass. A strong carbon enrichment in tandem with helium enrichment is predicted by the late hot flasher scenario, but not by the helium-enrichment scenario. We conclude that the helium-rich HB stars in ω Cen cannot be explained solely by the helium-enrichment scenario invoked to explain the blue main sequence.

Abstract Copyright:

Journal keyword(s): stars: horizontal-branch - stars: evolution - techniques: spectroscopic - globular clusters: individual: NGC5139

VizieR on-line data: <Available at CDS (J/A+A/526/A136): table1.dat table3.dat table4.dat>

Nomenclature: Table: [MDL2011] NNNNNN N=109 among (Nos 24609-194383).

Simbad objects: 121

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Number of rows : 121

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 717 0
2 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 815 0
3 IRAS 09110-6439 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1245 0
4 [MSL2002] J132534.25-472950.0 HB* 13 25 34.3 -47 29 50   18.708 18.921     ~ 4 0
5 [MSL2002] J132535.57-472745.1 HB* 13 25 35.5545034026 -47 27 45.468786550   18.836 19.103     ~ 4 0
6 [MDL2011] 26774 HB* 13 25 36.6 -47 31 08 17.182 18.645 18.838   19.001 ~ 2 0
7 [MDL2011] 29850 HB* 13 25 39.8 -47 28 57 16.995 18.411 18.602   18.775 ~ 2 0
8 [MDL2011] 30675 HB* 13 25 40.4980493654 -47 33 27.740807807 16.396 17.206 17.128     ~ 2 0
9 Cl* NGC 5139 BPB 184717 HB* 13 25 41.3 -47 29 06 17.539 18.803 18.900   19.186 ~ 6 0
10 [MDL2011] 32033 HB* 13 25 42.0208956588 -47 25 38.707271889   15.773       ~ 1 0
11 NGC 5139 2038 HB* 13 25 44.9516132708 -47 36 47.486984948 15.392 15.860 15.781     ~ 5 0
12 [MDL2011] 35828 HB* 13 25 45.5416032920 -47 28 27.868713059 16.890 18.229 18.405   18.526 ~ 2 0
13 Cl* NGC 5139 BPB 228757 HB* 13 25 46.4 -47 26 52 17.702 18.967 19.035   19.181 ~ 3 0
14 [MDL2011] 36669 HB* 13 25 46.5 -47 22 37 16.760 18.127 18.378   18.633 ~ 2 0
15 [MDL2011] 39876 HB* 13 25 49.1 -47 36 04   18.316       ~ 1 0
16 [MDL2011] 40846 HB* 13 25 50.0 -47 29 45 17.024 18.417 18.600   18.739 ~ 2 0
17 Cl* NGC 5139 BPB 123934 HB* 13 25 50.1360743976 -47 32 06.394948193 17.241 18.521 18.547   18.807 ~ 6 0
18 Cl* NGC 5139 BPB 132898 HB* 13 25 51.8644726261 -47 31 39.576874963 17.247 18.468 18.577   18.866 ~ 3 0
19 [MDL2011] 43520 HB* 13 25 52.3284789073 -47 22 57.759141001 17.204 18.580 18.791   18.998 ~ 2 0
20 Cl* NGC 5139 BPB 74786 HB* 13 25 53.8 -47 34 49 17.129 18.398 18.464   18.808 ~ 3 0
21 [MDL2011] 45734 HB* 13 25 53.9461446024 -47 35 21.796931306 17.147 18.612 18.806   18.918 ~ 2 0
22 Cl* NGC 5139 LEID 43031 HB* 13 25 54.0 -47 29 08   16.500 16.505     ~ 2 0
23 [MDL2011] 51359 HB* 13 25 58.5 -47 31 00 17.389 18.595 18.533   18.305 ~ 2 0
24 [MDL2011] 51341 HB* 13 25 58.6 -47 23 51   15.808       ~ 1 0
25 [MDL2011] 53022 HB* 13 25 59.8 -47 37 46   18.322       ~ 1 0
26 [MDL2011] 53367 HB* 13 26 00.1479796128 -47 35 17.715271031   19.112       ~ 1 0
27 Cl* NGC 5139 BPB 177506 HB* 13 26 00.7 -47 29 28 17.513 18.724 18.855 18.906 19.130 ~ 5 0
28 [MDL2011] 54733 HB* 13 26 01.4 -47 22 37 17.343 18.858 19.015   19.140 ~ 2 0
29 [MDL2011] 55158 HB* 13 26 01.5 -47 35 44 16.928 18.396 18.591   18.749 ~ 2 0
30 [MDL2011] 56896 HB* 13 26 03.0397981735 -47 20 29.484049622 16.789 18.258 18.436   18.515 ~ 2 0
31 Cl* NGC 5139 BPB 135445 HB* 13 26 04.3 -47 31 33 17.302 18.296 18.313   18.507 ~ 3 0
32 [MDL2011] 59125 HB* 13 26 04.5665220784 -47 30 21.883037043   15.807       ~ 1 0
33 [MDL2011] 59786 HB* 13 26 05.1566955132 -47 21 45.058279750 17.121 18.585 18.763   18.977 ~ 2 0
34 [MDL2011] 60820 HB* 13 26 05.8358319074 -47 29 25.316700521 16.564 18.029 18.236   18.392 ~ 2 0
35 [MDL2011] 65373 HB* 13 26 08.8261139362 -47 37 12.544370625 16.941 18.355 18.556   18.749 ~ 5 0
36 [MDL2011] 66104 HB* 13 26 09.4 -47 29 58 15.631 15.593 16.109     ~ 2 0
37 Cl* NGC 5139 BPB 263134 HB* 13 26 09.8200797080 -47 25 10.672612164 16.855 18.162 18.357   18.573 ~ 3 0
38 [MDL2011] 67933 HB* 13 26 10.5 -47 39 10   18.896       ~ 1 0
39 [MDL2011] 69373 HB* 13 26 11.5365235298 -47 27 51.474543052 16.590 17.870 18.039   18.165 ~ 2 0
40 [MDL2011] 71099 HB* 13 26 12.5727503118 -47 36 13.928616624 17.742 19.107 19.303   19.534 ~ 2 0
41 [MDL2011] 72787 HB* 13 26 13.8 -47 30 58   15.917       ~ 1 0
42 [MDL2011] 74069 HB* 13 26 14.6555446120 -47 26 47.227770300   16.859       ~ 1 0
43 [MDL2011] 75364 HB* 13 26 15.5 -47 25 03 17.390 18.904 19.068   19.175 ~ 2 0
44 [MDL2011] 75981 HB* 13 26 15.9 -47 28 09 16.899 18.313 18.513 18.513 18.692 ~ 4 0
45 [MDL2011] 75993 HB* 13 26 15.9 -47 28 30 16.847 18.206 18.359 18.359 18.444 ~ 5 0
46 [MDL2011] 80711 HB* 13 26 18.942 -47 25 08.99   15.898       ~ 1 0
47 [MDL2011] 80690 HB* 13 26 19.0 -47 20 20 17.039 18.453 18.623   18.839 ~ 2 0
48 Cl* NGC 5139 LEID 28034 HB* 13 26 19.4 -47 22 17   15.910 15.869     ~ 2 0
49 [MDL2011] 81722 HB* 13 26 19.5643328530 -47 28 48.836252640   16.304       ~ 1 0
50 Cl* NGC 5139 LEID 24038 HB* 13 26 20.3751652396 -47 20 14.096323855   16.000 15.956     ~ 2 0
51 Cl* NGC 5139 SAW V380 HB* 13 26 22.5700232916 -47 30 52.915988022 16.376 17.247 17.322 17.317 17.214 ~ 5 0
52 [MDL2011] 87161 HB* 13 26 23.0 -47 39 37 17.109 18.543 18.716   18.966 ~ 2 0
53 [MDL2011] 87175 HB* 13 26 23.0903856811 -47 26 10.113716131   16.132       ~ 1 0
54 Cl* NGC 5139 LEID 28035 HB* 13 26 23.5182907678 -47 21 54.433242863   16.110 16.034     ~ 2 0
55 Cl* NGC 5139 LEID 31065 HB* 13 26 24.7388886979 -47 23 25.239196108   15.940 15.944     ~ 2 0
56 [MDL2011] 92333 HB* 13 26 26.6576346805 -47 31 05.555960600   17.193       ~ 1 0
57 [MDL2011] 93516 HB* 13 26 27.6 -47 21 14   16.022       ~ 1 0
58 [MDL2011] 95401 HB* 13 26 28.9 -47 36 21 17.161 18.536 18.670   18.882 ~ 2 0
59 Cl* NGC 5139 LEID 25034 HB* 13 26 29.5545475174 -47 20 44.603527686   16.180 16.143     ~ 2 0
60 [MDL2011] 102600 HB* 13 26 34.1 -47 20 58 16.488 17.723 17.858   17.993 ~ 2 0
61 Cl* NGC 5139 LEID 31078 HB* 13 26 34.3 -47 23 20   16.300 16.221     ~ 2 0
62 [MDL2011] 103563 HB* 13 26 34.7 -47 40 25 16.801 18.028 18.151   18.242 ~ 2 0
63 [MDL2011] 111785 HB* 13 26 40.4696341690 -47 20 44.620053919 17.730 19.141 19.219   19.370 ~ 2 0
64 [MDL2011] 112475 HB* 13 26 40.9360163987 -47 18 42.623689853 17.084 18.504 18.621   18.831 ~ 2 0
65 Cl* NGC 5139 LEID 62042 HB* 13 26 42.3 -47 37 30   16.410 16.358     ~ 2 0
66 [MDL2011] 115087 HB* 13 26 42.7376019721 -47 36 33.805939972   16.534       ~ 1 0
67 [MDL2011] 115194 HB* 13 26 42.8 -47 21 18 16.855 18.117 18.164   18.106 ~ 2 0
68 [MDL2011] 120119 HB* 13 26 46.2 -47 22 50 17.660 18.852 19.000   19.392 ~ 2 0
69 [MDL2011] 120901 HB* 13 26 46.8 -47 33 29   18.987       ~ 1 0
70 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2997 0
71 [MDL2011] 124014 HB* 13 26 48.9 -47 33 30   19.036       ~ 1 0
72 [MDL2011] 125302 HB* 13 26 49.7 -47 21 52   16.233       ~ 1 0
73 [MDL2011] 126350 HB* 13 26 50.5 -47 22 06 16.295 17.231 17.239   17.237 ~ 2 0
74 [MDL2011] 126892 HB* 13 26 50.9 -47 37 11 16.979 18.389 18.541   18.752 ~ 2 0
75 [MDL2011] 130310 HB* 13 26 53.1 -47 36 13   15.981       ~ 1 0
76 [MDL2011] 130831 HB* 13 26 53.5 -47 33 10   16.195       ~ 1 0
77 [MDL2011] 133846 HB* 13 26 55.3 -47 35 57   16.129       ~ 1 0
78 [MDL2011] 135227 HB* 13 26 56.2 -47 34 37   18.816   18.985   ~ 2 0
79 [MDL2011] 137299 HB* 13 26 57.4175538308 -47 22 59.570599958 16.667 17.949 18.055   18.115 ~ 2 0
80 [MDL2011] 141008 HB* 13 26 59.8 -47 21 14 17.186 18.646 18.794   19.037 ~ 2 0
81 [MDL2011] 144749 HB* 13 27 02.2 -47 25 45   18.386       ~ 1 0
82 [MDL2011] 145078 HB* 13 27 02.4 -47 25 11   17.984       ~ 1 0
83 Cl* NGC 5139 BPB 71783 HB* 13 27 04.163 -47 35 02.11 15.433 15.967 15.992     ~ 2 0
84 [MDL2011] 147880 HB* 13 27 04.338 -47 34 25.33   15.950       ~ 1 0
85 [MDL2011] 148641 HB* 13 27 04.7 -47 23 03   19.815       ~ 1 0
86 [MDL2011] 156459 HB* 13 27 10.2 -47 27 34   15.975       ~ 1 0
87 [MDL2011] 161310 HB* 13 27 13.6341576629 -47 39 23.483974051   18.047       ~ 1 0
88 Cl* NGC 5139 LEID 33149 HB* 13 27 14.5556200606 -47 24 07.326685346   16.350 16.255     ~ 2 0
89 [MDL2011] 164808 HB* 13 27 16.1 -47 34 02 17.217 18.549 18.735 18.735 19.008 ~ 5 0
90 Cl* NGC 5139 LEID 66056 HB* 13 27 16.4829888684 -47 39 28.244445188   15.960 15.906     ~ 2 0
91 [MDL2011] 169814 HB* 13 27 19.7435012603 -47 26 55.201274622   16.392       ~ 1 0
92 Cl* NGC 5139 LEID 59080 HB* 13 27 20.2 -47 36 07   16.010 15.956     ~ 2 0
93 [MDL2011] 170450 HB* 13 27 20.4500242808 -47 38 41.697681934   18.005       ~ 1 0
94 [MDL2011] 171696 HB* 13 27 21.271 -47 27 18.51   16.067       ~ 1 0
95 Cl* NGC 5139 LEID 32160 HB* 13 27 21.7 -47 23 45   16.460 16.387     ~ 2 0
96 [MDL2011] 174389 HB* 13 27 23.6 -47 32 31   16.152       ~ 1 0
97 [MDL2011] 177314 HB* 13 27 26.0 -47 32 43   17.442       ~ 1 0
98 [MDL2011] 180375 HB* 13 27 28.7 -47 30 35   16.218       ~ 1 0
99 [MDL2011] 180714 HB* 13 27 29.0713179587 -47 34 59.629462473   18.156       ~ 1 0
100 [MDL2011] 181678 HB* 13 27 29.7895527346 -47 24 21.894414290 17.015 18.599 18.678   18.686 ~ 2 0
101 Cl* NGC 5139 LEID 51241 HB* 13 27 30.2935019266 -47 32 23.731068151   16.370 16.302     ~ 5 0
102 Cl* NGC 5139 BPB 221265 HB* 13 27 30.9971098602 -47 27 16.820272497 16.457 17.764 17.802   18.112 ~ 3 0
103 Cl* NGC 5139 BPB 188947 HB* 13 27 32.0 -47 28 55 17.016 18.195 18.171   18.216 ~ 3 0
104 [MDL2011] 186476 HB* 13 27 36.2160433290 -47 32 41.933336705 17.080 18.545 18.688   18.807 ~ 2 0
105 [MDL2011] 187534 HB* 13 27 37.9273938642 -47 30 30.863610925 16.890 18.260 18.705   18.704 ~ 2 0
106 [MDL2011] 188882 HB* 13 27 40.4 -47 34 02   17.001       ~ 1 0
107 [MDL2011] 189080 HB* 13 27 40.8 -47 31 54 17.023 18.511 18.577   18.390 ~ 2 0
108 [MDL2011] 190398 HB* 13 27 43.3 -47 27 01 17.034 18.656 18.800   18.858 ~ 2 0
109 [MDL2011] 190635 HB* 13 27 43.8 -47 27 23 15.907 16.675 16.650     ~ 2 0
110 [MDL2011] 191111 HB* 13 27 44.7 -47 25 20 17.075 18.565 18.717   18.801 ~ 2 0
111 2MASS J13274671-4733157 HB* 13 27 46.71 -47 33 15.8   16.170 16.134     ~ 2 0
112 [MDL2011] 193486 HB* 13 27 50.3 -47 32 18   16.755       ~ 1 0
113 Cl* NGC 5139 BPB 214091 HB* 13 27 52.6 -47 27 39 16.453 17.430 17.457   17.430 ~ 3 0
114 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2266 0
115 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2007 0
116 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 307 1
117 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 805 1
118 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1799 1
119 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 768 0
120 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 898 0
121 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1807 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-19:20:01

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