2014A&A...564A..60C

Query : 2014A&A...564A..60C

2014A&A...564A..60C - Astronomy and Astrophysics, volume 564A60-60 (2014/4-1)

The extreme chemistry of multiple stellar populations in the metal-poor globular cluster NGC 4833.

CARRETTA E., BRAGAGLIA A., GRATTON R.G., D'ORAZI V., LUCATELLO S., MOMANY Y., SOLLIMA A., BELLAZZINI M., CATANZARO G. and LEONE F.

Abstract (from CDS):

Our FLAMES survey of Na-O anticorrelation in globular clusters (GCs) is extended to NGC 4833, a metal-poor GC with a long blue tail on the horizontal branch (HB). We present the abundance analysis for a large sample of 78 red giants based on UVES and GIRAFFE spectra acquired at the ESO-VLT. We derived abundances of Na, O, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Ba, La, and Nd. This is the first extensive study of this cluster from high resolution spectroscopy. On the scale of our survey, the metallicity of NGC 4833 is [Fe/H]=-2.015±0.004±0.084dex (rms=0.014dex) from 12 stars observed with UVES, where the first error is from statistics and the second one refers to the systematic effects. The iron abundance in NGC 4833 is homogeneous at better than 6%. On the other hand, the light elements involved in proton-capture reactions at high temperature show the large star-to-star variations observed in almost all GCs studied so far. The Na-O anticorrelation in NGC 4833 is quite extended, as expected from the high temperatures reached by stars on the HB, and NGC 4833 contains a conspicuous fraction of stars with extreme [O/Na] ratios. More striking is the finding that large star-to-star variations are also seen for Mg, which spans a range of more than 0.5dex in this GC. Depletions in Mg are correlated to the abundances of O and anti-correlated with Na, Al, and Si abundances. This pattern suggests the action of nuclear processing at unusually high temperatures, producing the extreme chemistry observed in the stellar generations of NGC 4833. These extreme changes are also seen in giants of the much more massive GCs M 54 and ω Cen, and our conclusion is that NGC 4833 has probably lost a conspicuous fraction of its original mass due to bulge shocking, as also indicated by its orbit.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: atmospheres - stars: Population II - globular clusters: general - globular clusters: individual: NGC 4833

VizieR on-line data: <Available at CDS (J/A+A/564/A60): table2.dat table6.dat-table11.dat >

Nomenclature: Table 2: [CBG2014] NNNNN N=78 among (Nos 22810-38029).

Simbad objects: 102

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Number of rows : 102
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 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
4 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
5 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
6 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 275 0
7 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
8 2MASS J12583810-7052589 RG* 12 58 38.0958665040 -70 52 58.995539832   16.272 15.254     ~ 6 0
9 2MASS J12584969-7055170 RG* 12 58 49.6932745440 -70 55 17.259725964   16.736 15.696     ~ 3 0
10 2MASS J12585034-7053213 RG* 12 58 50.3543881368 -70 53 21.419236140   16.813 15.843     ~ 6 0
11 2MASS J12585056-7051285 RG* 12 58 50.5940611536 -70 51 28.577495880   16.800 15.840     ~ 2 0
12 2MASS J12585410-7053468 RG* 12 58 54.1202690448 -70 53 46.937380812   14.660 13.343     ~ 2 0
13 2MASS J12585486-7054590 RG* 12 58 54.8575543080 -70 54 59.151451032   16.153 15.056     ~ 7 0
14 2MASS J12585526-7052323 RG* 12 58 55.2895160256 -70 52 32.417555340   16.349 15.385     ~ 6 0
15 2MASS J12585831-7052484 RG* 12 58 58.3343269656 -70 52 48.574731288   15.963 14.926     ~ 7 0
16 2MASS J12585921-7051390 RG* 12 58 59.2231256712 -70 51 39.150719064   16.906 15.972     ~ 2 0
17 2MASS J12590175-7052144 RG* 12 59 01.7669478672 -70 52 14.408209020   15.351 14.221     ~ 3 0
18 2MASS J12590257-7050243 RG* 12 59 02.5794904296 -70 50 24.352682208   16.316 15.357     ~ 3 0
19 UCAC2 1491370 RG* 12 59 05.1919659096 -70 54 53.963799876   14.299 12.488 12.072 10.61 ~ 12 0
20 2MASS J12590556-7056599 RG* 12 59 05.5548549624 -70 56 59.958742704   16.470 15.491     ~ 3 0
21 2MASS J12590810-7053169 RG* 12 59 08.1144282888 -70 53 17.103062040   15.928 14.902     ~ 3 0
22 2MASS J12591268-7054500 RG* 12 59 12.6857057928 -70 54 50.177527992   16.395 15.359     ~ 3 0
23 2MASS J12591283-7052360 RG* 12 59 12.8446191768 -70 52 36.077754216   16.398 15.395     ~ 3 0
24 2MASS J12591376-7051459 RG* 12 59 13.7656290120 -70 51 46.022892948   16.288 15.329     ~ 2 0
25 2MASS J12591376-7050292 RG* 12 59 13.7754277824 -70 50 29.278782924   16.572 15.632     ~ 3 0
26 2MASS J12591438-7052456 RG* 12 59 14.3988264408 -70 52 45.670720944   15.023 13.864     ~ 3 0
27 2MASS J12591490-7053450 RG* 12 59 14.9060563416 -70 53 45.083803668   14.963 13.763     ~ 5 0
28 2MASS J12591608-7053289 RG* 12 59 16.0828333032 -70 53 29.069460528   14.916 13.663     ~ 7 0
29 2MASS J12591612-7053042 RG* 12 59 16.1272529160 -70 53 04.331948208   15.990 14.935     ~ 3 0
30 2MASS J12591727-7051550 RG* 12 59 17.2825045680 -70 51 55.115825544   16.255 15.243     ~ 3 0
31 2MASS J12591765-7052147 RG* 12 59 17.6507620392 -70 52 14.799164916   14.356 12.892     ~ 2 0
32 2MASS J12591885-7053310 RG* 12 59 18.8564579184 -70 53 31.136507700   15.495 14.329     ~ 4 0
33 2MASS J12592040-7051155 RG* 12 59 20.4051987480 -70 51 15.611545080   15.421 14.288     ~ 6 0
34 2MASS J12592041-7054347 RG* 12 59 20.4132622464 -70 54 34.828143408   16.395 15.328     ~ 3 0
35 2MASS J12592170-7051428 RG* 12 59 21.7073689008 -70 51 42.976348200   15.213 14.051     ~ 6 0
36 2MASS J12592447-7051181 RG* 12 59 24.4713482592 -70 51 18.284294304   14.627 13.337     ~ 1 0
37 2MASS J12592466-7054132 RG* 12 59 24.666 -70 54 13.30   16.883 15.889     ~ 2 0
38 2MASS J12592630-7050458 RG* 12 59 26.3168906136 -70 50 45.974222160   15.364 14.267     ~ 6 0
39 2MASS J12592770-7051380 RG* 12 59 27.6942039384 -70 51 38.135066040   16.935 15.997     ~ 2 0
40 2MASS J12592785-7049549 RG* 12 59 27.8703548352 -70 49 55.073416404   16.205 15.239     ~ 2 0
41 2MASS J12592917-7057473 RG* 12 59 29.1747526608 -70 57 47.480260896   17.440 16.469     ~ 2 0
42 2MASS J12592952-7053510 RG* 12 59 29.5270531800 -70 53 51.197625924   14.772 13.450     ~ 3 0
43 2MASS J12592970-7055230 RG* 12 59 29.7127486992 -70 55 23.213426232   17.156 16.164     ~ 2 0
44 2MASS J12593082-7054066 RG* 12 59 30.8286331608 -70 54 06.755497164   16.702 15.748     ~ 1 0
45 2MASS J12593088-7050304 RG* 12 59 30.8906362848 -70 50 30.457722408   15.103 13.956     ~ 7 0
46 2MASS J12593129-7053356 RG* 12 59 31.3002834024 -70 53 35.764211148   16.429 15.435     ~ 1 0
47 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 467 0
48 2MASS J12593471-7055000 RG* 12 59 34.7206864584 -70 55 00.139235592   15.059 13.866     ~ 3 0
49 2MASS J12593474-7053377 RG* 12 59 34.7342394576 -70 53 37.863181284   16.700 15.697     ~ 2 0
50 2MASS J12593489-7054428 RG* 12 59 34.8979883664 -70 54 43.001186292   16.319 15.264     ~ 2 0
51 2MASS J12593496-7051184 RG* 12 59 34.9664364120 -70 51 18.570604068   14.828 13.584     ~ 3 0
52 2MASS J12593817-7051076 RG* 12 59 38.1834471888 -70 51 07.640968932   16.143 15.127     ~ 2 0
53 2MASS J12593820-7054413 RG* 12 59 38.2115087640 -70 54 41.542761528   14.961 13.754     ~ 3 0
54 2MASS J12593902-7053338 RG* 12 59 39.0226282344 -70 53 33.955859472   15.407 14.287     ~ 4 0
55 2MASS J12594152-7051066 RG* 12 59 41.5235620296 -70 51 06.740008020   14.660 13.408     ~ 2 0
56 2MASS J12594200-7053593 RG* 12 59 42.0001305648 -70 53 59.470188288   15.346 14.183     ~ 6 0
57 2MASS J12594232-7056209 RG* 12 59 42.3261224520 -70 56 21.157249200   16.491 15.460     ~ 3 0
58 2MASS J12594271-7051180 RG* 12 59 42.7173616320 -70 51 18.180987552   15.092 13.944     ~ 7 0
59 2MASS J12594275-7055472 RG* 12 59 42.7599421656 -70 55 47.399593512   14.509 13.056     ~ 3 0
60 2MASS J12594288-7053174 RG* 12 59 42.881 -70 53 17.40   15.720 14.650     ~ 3 0
61 2MASS J12594303-7053527 RG* 12 59 43.0628656416 -70 53 52.756894680   15.009 13.816     ~ 5 0
62 2MASS J12594407-7054127 RG* 12 59 44.0781808416 -70 54 12.860299044   14.226 12.652     ~ 2 0
63 2MASS J12594644-7052581 RG* 12 59 46.4452701768 -70 52 58.298589444   15.800 14.727     ~ 4 0
64 2MASS J12594719-7052293 RG* 12 59 47.1858490728 -70 52 29.486778276   16.030 14.989     ~ 2 0
65 2MASS J12594720-7056139 RG* 12 59 47.2062154560 -70 56 14.102316348   15.222 14.001     ~ 3 0
66 2MASS J12594736-7051161 RG* 12 59 47.3735408568 -70 51 16.245739296   14.797 13.600     ~ 6 0
67 2MASS J12594761-7052467 RG* 12 59 47.6161613592 -70 52 46.815259080   14.938 13.707     ~ 3 0
68 2MASS J12595011-7052017 RG* 12 59 50.1235544472 -70 52 01.864741692   15.184 14.030     ~ 3 0
69 2MASS J12595651-7051182 RG* 12 59 56.5142935344 -70 51 18.262080540   16.846 15.945     ~ 1 0
70 2MASS J12595673-7052099 RG* 12 59 56.7298459848 -70 52 09.901198416   14.123 12.571     ~ 4 0
71 2MASS J12595690-7055195 RG* 12 59 56.8975016832 -70 55 19.399664568   17.142 16.165     ~ 6 0
72 2MASS J12595807-7051321 RG* 12 59 58.0718300040 -70 51 32.125664520   17.239 16.354     ~ 3 0
73 2MASS J13000181-7054186 RG* 13 00 01.8130842936 -70 54 18.485197272   17.160 16.255     ~ 3 0
74 2MASS J13000421-7052539 RG* 13 00 04.2009471576 -70 52 53.968816452   15.668 14.571     ~ 3 0
75 2MASS J13000987-7051419 RG* 13 00 09.8686012632 -70 51 41.932527012   16.204 15.222     ~ 3 0
76 2MASS J13001034-7052205 RG* 13 00 10.3320146544 -70 52 20.555910480   15.952 14.929     ~ 3 0
77 2MASS J13001309-7052494 RG* 13 00 13.0893765720 -70 52 49.371833640   14.767 13.511     ~ 5 0
78 2MASS J13001363-7052323 RG* 13 00 13.6294825536 -70 52 32.284632036   17.074 16.126     ~ 3 0
79 2MASS J13001404-7051243 RG* 13 00 14.0335587000 -70 51 24.363087768   16.826 15.903     ~ 3 0
80 2MASS J13001483-7052438 RG* 13 00 14.8272268296 -70 52 43.864689252   14.817 13.555     ~ 5 0
81 2MASS J13001607-7052063 RG* 13 00 16.0730131296 -70 52 06.313898352   16.101 15.097     ~ 3 0
82 2MASS J13001649-7057075 RG* 13 00 16.5085939200 -70 57 07.500971700   15.156 13.898     ~ 2 0
83 2MASS J13002210-7056246 RG* 13 00 22.1082574656 -70 56 24.498181428   15.601 14.450     ~ 3 0
84 2MASS J13002347-7055174 RG* 13 00 23.4722938488 -70 55 17.354080488   16.627 15.648     ~ 3 0
85 2MASS J13003316-7056304 RG* 13 00 33.1732767072 -70 56 30.464686392   14.275 12.626     ~ 3 0
86 2MASS J13004339-7055503 RG* 13 00 43.3984527384 -70 55 50.347759764   15.890 14.771     ~ 7 0
87 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
88 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
89 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
90 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
91 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
92 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
93 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
94 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
95 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
96 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
97 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
98 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
99 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0
100 NGC 7492 GlC 23 08 26.68 -15 36 41.3     10.48     ~ 330 0
101 NAME Local Group GrG ~ ~           ~ 9325 0
102 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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