2011A&A...527A.148L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:29:10

2011A&A...527A.148L - Astronomy and Astrophysics, volume 527A, 148-148 (2011/3-1)

Tracing the evolution of NGC 6397 through the chemical composition of its stellar populations.

LIND K., CHARBONNEL C., DECRESSIN T., PRIMAS F., GRUNDAHL F. and ASPLUND M.

Abstract (from CDS):

The chemical compositions of globular clusters provide important information on the star formation that occurred at very early times in the Galaxy. In particular the abundance patterns of elements with atomic number z≤13 may shed light on the properties of stars that early on enriched parts of the star-forming gas with the rest-products of hydrogen-burning at high temperatures. We analyse and discuss the chemical compositions of a large number of elements in 21 red giant branch stars in the metal-poor globular cluster NGC6397. We compare the derived abundance patterns with theoretical predictions in the framework of the ``wind of fast rotating massive star''-scenario. High-resolution spectra were obtained with the FLAMES/UVES spectrograph on the VLT. We determined non-LTE abundances of Na, and LTE abundances for the remaining 21 elements, including O (from the [OI] line at 630nm), Mg, Al, α, iron-peak, and neutron-capture elements, many of which had not been previously analysed for this cluster. We also considered the influence of possible He enrichment in the analysis of stellar spectra. We find that the Na abundances of evolved, as well as unevolved, stars in NGC6397 show a distinct bimodality, which is indicative of two stellar populations: one primordial stellar generation of composition similar to field stars, and a second generation that is polluted with material processed during hydrogen-burning, i.e., enriched in Na and Al and depleted in O and Mg. The red giant branch exhibits a similar bimodal distribution in the Stroemgren colour index cy=c1-(b-y), implying that there are also large differences in the N abundance. The two populations have the same composition for all analysed elements heavier than Al, within the measurement uncertainty of the analysis, with the possible exception of [Y/Fe]. Using two stars with almost identical stellar parameters, one from each generation, we estimate the difference in He content, ΔY=0.01±0.06, given the assumption that the mass fraction of iron is the same for the stars. NGC6397 hosts two stellar populations that have different chemical compositions of N, O, Na, Mg, and probably Al. The cluster is dominated (75%) by the second generation. We show that massive stars of the first generation can be held responsible for the abundance patterns observed in the second generation long-lived stars of NGC6397. We estimate that the initial mass of this globular cluster is at least ten times higher than its present-day value.

Abstract Copyright:

Journal keyword(s): stars: Population II - globular clusters: individual: NGC 6397 - methods: observational - techniques: spectroscopic - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/527/A148): table1.dat table2.dat>

Simbad objects: 140

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Number of rows : 140

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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3547 0
2 IRAS 09110-6439 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1244 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2996 0
4 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1771 0
5 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1676 0
6 [LPC2009] 2315 RG* 17 39 33.44 -53 39 15.0     16.892     ~ 2 0
7 2MASS J17393475-5341157 RG* 17 39 34.7704340510 -53 41 15.862765174   15.295 14.519     ~ 3 0
8 2MASS J17393795-5340531 RG* 17 39 37.9629117194 -53 40 53.231814792     15.935   15.01 ~ 3 0
9 2MASS J17393798-5341554 RG* 17 39 37.989 -53 41 55.43     16.241     ~ 2 0
10 2MASS J17393880-5341387 RG* 17 39 38.8091164727 -53 41 38.867384751     16.587     ~ 2 0
11 2MASS J17394052-5343440 RG* 17 39 40.5281511473 -53 43 44.131223390     16.192     ~ 2 0
12 2MASS J17394064-5338179 RG* 17 39 40.644 -53 38 17.98     16.448     ~ 2 0
13 2MASS J17394297-5339253 RG* 17 39 42.9862350947 -53 39 25.449116945     16.231   15.39 ~ 3 0
14 2MASS J17394372-5340506 RG* 17 39 43.7301237110 -53 40 50.712482307   16.44 15.966   15.05 ~ 4 0
15 2MASS J17394424-5340150 RG* 17 39 44.2492228872 -53 40 15.075326694     15.930     ~ 2 0
16 2MASS J17394474-5339465 RG* 17 39 44.7643121497 -53 39 46.606525615     16.263   15.41 ~ 3 0
17 2MASS J17394538-5340560 RG* 17 39 45.3894272668 -53 40 56.144571742     15.914     ~ 2 0
18 [LPC2009] 4355 RG* 17 39 46.04 -53 37 11.2     16.653     ~ 2 0
19 2MASS J17394781-5341066 RG* 17 39 47.8179630361 -53 41 06.755506366   14.388 13.584     ~ 3 0
20 2MASS J17394842-5339252 RG* 17 39 48.425 -53 39 25.20     16.340     ~ 2 0
21 2MASS J17394868-5341370 RG* 17 39 48.6801591563 -53 41 37.079410858     15.813     ~ 2 0
22 2MASS J17394908-5338514 RG* 17 39 49.0947702921 -53 38 51.600107740     16.383     ~ 2 0
23 [LPC2009] 5044 RG* 17 39 49.6582001785 -53 40 41.309715415     16.418     ~ 2 0
24 2MASS J17395095-5342479 RG* 17 39 50.956 -53 42 47.90   16.54 16.060     ~ 3 0
25 [LPC2009] 5361 RG* 17 39 51.13 -53 39 42.9     16.121     ~ 2 0
26 2MASS J17395177-5337192 RG* 17 39 51.778 -53 37 19.26     16.436     ~ 2 0
27 [LPC2009] 5577 RG* 17 39 52.0891535729 -53 36 54.090224718     16.318     ~ 2 0
28 2MASS J17395249-5339111 RG* 17 39 52.5082545683 -53 39 11.290268421   12.37 11.53     ~ 2 0
29 2MASS J17395263-5342098 RG* 17 39 52.6436116189 -53 42 10.000210956     16.416     ~ 2 0
30 2MASS J17395321-5337479 RG* 17 39 53.212 -53 37 47.99     16.362     ~ 2 0
31 2MASS J17395364-5338379 RG* 17 39 53.6572958679 -53 38 38.086785865     15.014     ~ 2 0
32 [LPC2009] 6001 RG* 17 39 54.25 -53 39 13.8     16.824     ~ 2 0
33 2MASS J17395491-5342240 RG* 17 39 54.9205478487 -53 42 24.299134583     16.171   15.31 ~ 3 0
34 2MASS J17395523-5337289 RG* 17 39 55.2363319062 -53 37 28.987642501     16.528     ~ 2 0
35 [LPC2009] 6301 RG* 17 39 55.7399418686 -53 41 34.187570649     16.117     ~ 2 0
36 2MASS J17395678-5340298 RG* 17 39 56.7913555190 -53 40 29.964074949     15.954   15.08 ~ 3 0
37 2MASS J17395735-5338013 RG* 17 39 57.358 -53 38 01.37     16.335     ~ 2 0
38 2MASS J17395763-5341372 RG* 17 39 57.6483991896 -53 41 37.357963011     16.841     ~ 2 0
39 2MASS J17395770-5338394 RG* 17 39 57.7147189607 -53 38 39.620956992     15.832   14.89 ~ 3 0
40 2MASS J17395835-5337503 RG* 17 39 58.3656228790 -53 37 50.560679569     15.089     ~ 2 0
41 2MASS J17395841-5340453 RG* 17 39 58.4288208897 -53 40 45.532358826     16.339     ~ 2 0
42 2MASS J17395891-5343160 RG* 17 39 58.915 -53 43 16.01     15.976   15.09 ~ 3 0
43 2MASS J17395994-5341205 RG* 17 39 59.9419480015 -53 41 20.572972197     15.201     ~ 2 0
44 2MASS J17400019-5340146 RG* 17 40 00.2021692629 -53 40 14.710815318     16.401     ~ 2 0
45 2MASS J17400127-5338451 RG* 17 40 01.2761043993 -53 38 45.223662043     16.417     ~ 2 0
46 2MASS J17400152-5343467 RG* 17 40 01.5245358212 -53 43 46.862761383     15.932   14.98 ~ 3 0
47 2MASS J17400167-5342545 RG* 17 40 01.6670528670 -53 42 54.602519608     14.379     ~ 2 0
48 2MASS J17400168-5337219 RG* 17 40 01.6923388929 -53 37 21.939568929   15.121 14.341     ~ 3 0
49 2MASS J17400190-5340360 RG* 17 40 01.9114081424 -53 40 36.152127780     16.228     ~ 2 0
50 2MASS J17400328-5337226 RG* 17 40 03.2876585704 -53 37 22.779105041     15.334     ~ 2 0
51 2MASS J17400332-5342468 RG* 17 40 03.3247761888 -53 42 46.896595869     16.229   15.38 ~ 3 0
52 2MASS J17400367-5338162 RG* 17 40 03.6801844030 -53 38 16.282752989     16.182     ~ 2 0
53 [LPC2009] 8225 RG* 17 40 03.69 -53 37 58.4     16.703     ~ 2 0
54 2MASS J17400430-5339303 RG* 17 40 04.303 -53 39 30.33     15.971   15.09 ~ 3 0
55 [LPC2009] 8341 RG* 17 40 04.3407314416 -53 40 40.726568752     16.886     ~ 2 0
56 2MASS J17400543-5338198 RG* 17 40 05.4383416018 -53 38 19.899681606     16.119   15.26 ~ 3 0
57 [LPC2009] 8828 RG* 17 40 05.9310138654 -53 37 03.728941378     16.638     ~ 2 0
58 2MASS J17400610-5342244 RG* 17 40 06.1031268334 -53 42 24.512150663   16.47 15.951     ~ 3 0
59 2MASS J17400635-5342090 RG* 17 40 06.354 -53 42 09.05   16.48 15.973   15.07 ~ 4 0
60 2MASS J17400658-5340283 RG* 17 40 06.5931535215 -53 40 28.419555780   13.297 12.422     ~ 3 0
61 2MASS J17400678-5336361 RG* 17 40 06.7951282844 -53 36 36.220928166     16.559     ~ 2 0
62 2MASS J17400698-5335506 RG* 17 40 07.0007876287 -53 35 50.673287853     16.302     ~ 2 0
63 [LPC2009] 9247 RG* 17 40 07.4569719062 -53 38 44.392217096     16.311     ~ 2 0
64 2MASS J17400804-5337290 RG* 17 40 08.0504573108 -53 37 29.086667488   13.839 12.987     ~ 3 0
65 [LPC2009] 9344 RG* 17 40 08.0534579679 -53 43 55.666362484     15.288     ~ 2 0
66 2MASS J17400841-5342515 RG* 17 40 08.4077868540 -53 42 51.711571986     15.934   15.02 ~ 3 0
67 2MASS J17400873-5340041 RG* 17 40 08.7489175390 -53 40 04.247466813     16.304     ~ 2 0
68 2MASS J17400904-5342360 RG* 17 40 09.0451991355 -53 42 36.143740148   14.225 13.410     ~ 3 0
69 2MASS J17401022-5337461 RG* 17 40 10.2404972667 -53 37 46.172804049     16.609     ~ 2 0
70 2MASS J17401045-5338325 RG* 17 40 10.4656631155 -53 38 32.610155627     16.644     ~ 2 0
71 2MASS J17401130-5340060 RG* 17 40 11.309 -53 40 06.01     16.529     ~ 2 0
72 2MASS J17401133-5341559 RG* 17 40 11.335 -53 41 55.99     16.209     ~ 2 0
73 2MASS J17401203-5337160 RG* 17 40 12.0425762798 -53 37 16.030720781     16.258     ~ 2 0
74 2MASS J17401225-5336451 RG* 17 40 12.258 -53 36 45.19     16.413     ~ 2 0
75 2MASS J17401283-5343118 RG* 17 40 12.8324034778 -53 43 11.930488951   13.435 12.540     ~ 3 0
76 [LPC2009] 10849 RG* 17 40 12.96 -53 38 29.5     16.561     ~ 2 0
77 2MASS J17401365-5340015 RG* 17 40 13.6610638720 -53 40 01.681385099     16.741     ~ 2 0
78 2MASS J17401372-5339153 RG* 17 40 13.7202286470 -53 39 15.488880193     16.238   15.43 ~ 3 0
79 2MASS J17401406-5340406 RG* 17 40 14.0789055318 -53 40 40.772039940     16.368     ~ 2 0
80 2MASS J17401411-5343192 RG* 17 40 14.1164451213 -53 43 19.299171173   15.090 14.308     ~ 3 0
81 [LPC2009] 11253 RG* 17 40 14.31 -53 38 55.5     16.014     ~ 2 0
82 2MASS J17401476-5341440 RG* 17 40 14.7794607167 -53 41 44.112442269   14.160 13.350     ~ 3 0
83 2MASS J17401482-5337284 RG* 17 40 14.827 -53 37 28.42     16.281     ~ 2 0
84 [LPC2009] 11444 RG* 17 40 14.89 -53 38 37.9   16.42 15.901     ~ 3 0
85 2MASS J17401533-5343058 RG* 17 40 15.3255722955 -53 43 05.843871265     16.174     ~ 2 0
86 [LPC2009] 11621 RG* 17 40 15.67 -53 42 19.4     16.545     ~ 2 0
87 2MASS J17401704-5335531 RG* 17 40 17.0566121997 -53 35 53.163973364     16.348     ~ 2 0
88 2MASS J17401715-5338213 RG* 17 40 17.1546479203 -53 38 21.426668597     16.570     ~ 2 0
89 2MASS J17401717-5336141 RG* 17 40 17.174 -53 36 14.19     16.411     ~ 2 0
90 2MASS J17401723-5341573 RG* 17 40 17.2366917549 -53 41 57.402939782   12.59 11.78     ~ 2 0
91 2MASS J17401754-5339066 RG* 17 40 17.5568038175 -53 39 06.828362977   14.982 14.208     ~ 3 0
92 2MASS J17401760-5342300 RG* 17 40 17.6076392070 -53 42 30.046859113     16.344     ~ 2 0
93 2MASS J17401764-5339341 RG* 17 40 17.6487257518 -53 39 34.230859115   16.581 16.182   15.601 ~ 3 0
94 [LPC2009] 12650 RG* 17 40 18.66 -53 38 53.1     16.129     ~ 2 0
95 2MASS J17401948-5334288 RG* 17 40 19.4890988206 -53 34 28.810484935   13.71 12.82     ~ 11 0
96 2MASS J17401990-5339489 RG* 17 40 19.9134114365 -53 39 49.106883913     16.010   15.16 ~ 3 0
97 [LPC2009] 13066 RG* 17 40 20.0169395886 -53 40 52.865153569     16.599     ~ 2 0
98 2MASS J17402036-5343185 RG* 17 40 20.365 -53 43 18.57     15.821   14.90 ~ 3 0
99 2MASS J17402118-5337566 RG* 17 40 21.188 -53 37 56.68   16.53 16.086     ~ 3 0
100 2MASS J17402135-5341433 RG* 17 40 21.351 -53 41 43.39     16.043   15.19 ~ 3 0
101 [LPC2009] 13535 RG* 17 40 21.3897517439 -53 43 05.414224834   16.50 15.988   15.12 ~ 4 0
102 2MASS J17402218-5339438 RG* 17 40 22.2014465661 -53 39 43.997741730     16.205     ~ 2 0
103 [LPC2009] 13964 RG* 17 40 22.44 -53 40 42.7     16.193     ~ 2 0
104 2MASS J17402339-5337069 RG* 17 40 23.394 -53 37 06.91     16.360     ~ 2 0
105 [LPC2009] 14412 RG* 17 40 23.4531401898 -53 37 41.595336264     16.515     ~ 2 0
106 Cl* NGC 6397 KGR 14592 RG* 17 40 23.8479937471 -53 36 40.509435992   14.338 13.696     ~ 3 0
107 2MASS J17402407-5342527 RG* 17 40 24.0746565257 -53 42 52.783530305   12.37 12.21     ~ 2 0
108 2MASS J17402414-5338353 RG* 17 40 24.1546093286 -53 38 35.392271328   16.44 15.925     ~ 3 0
109 2MASS J17402463-5336253 RG* 17 40 24.636 -53 36 25.39     16.809     ~ 2 0
110 2MASS J17402472-5338455 RG* 17 40 24.726 -53 38 45.53     16.115     ~ 2 0
111 2MASS J17402528-5339274 RG* 17 40 25.281 -53 39 27.47     15.907     ~ 2 0
112 [LPC2009] 15108 RG* 17 40 25.43 -53 41 09.0     16.235     ~ 2 0
113 [LPC2009] 15121 RG* 17 40 25.50 -53 41 40.9     16.188     ~ 2 0
114 [LPC2009] 15192 RG* 17 40 25.53 -53 38 58.6     15.973     ~ 2 0
115 2MASS J17402591-5335541 RG* 17 40 25.9129073848 -53 35 54.240238905   15.514 14.781     ~ 3 0
116 2MASS J17402631-5340519 RG* 17 40 26.3179059252 -53 40 52.055901612     16.733     ~ 2 0
117 [LPC2009] 15811 RG* 17 40 27.24 -53 40 00.4     16.242     ~ 2 0
118 2MASS J17402767-5342161 RG* 17 40 27.6740628712 -53 42 16.176808669   16.41 15.916     ~ 3 0
119 [LPC2009] 16169 RG* 17 40 28.09 -53 38 58.4     15.981     ~ 2 0
120 2MASS J17402817-5337257 RG* 17 40 28.1790550239 -53 37 25.864769313   13.951 13.117     ~ 3 0
121 2MASS J17402864-5338323 RG* 17 40 28.6441701780 -53 38 32.422286155     11.771     ~ 2 0
122 2MASS J17402970-5339130 RG* 17 40 29.7089752075 -53 39 13.014533562     15.987     ~ 2 0
123 2MASS J17403068-5342258 RG* 17 40 30.6927194521 -53 42 25.917455225   12.971 12.067     ~ 4 0
124 2MASS J17403085-5337518 RG* 17 40 30.852 -53 37 51.82     16.691     ~ 2 0
125 [LPC2009] 17526 RG* 17 40 31.5049134867 -53 41 36.927178799     16.372     ~ 2 0
126 2MASS J17403192-5341537 RG* 17 40 31.9209629184 -53 41 53.733812740   13.591 12.733     ~ 3 0
127 [LPC2009] 18050 RG* 17 40 32.64 -53 39 43.5     16.070     ~ 2 0
128 2MASS J17403302-5338400 RG* 17 40 33.028 -53 38 40.02     16.453     ~ 2 0
129 [LPC2009] 18376 RG* 17 40 33.37 -53 39 00.1     16.967     ~ 2 0
130 [LPC2009] 18741 RG* 17 40 34.28 -53 39 52.4     15.958     ~ 2 0
131 [LPC2009] 19034 RG* 17 40 35.02 -53 42 00.6     16.830     ~ 2 0
132 [LPC2009] 19760 RG* 17 40 36.5517908243 -53 39 03.079413004     16.092     ~ 2 0
133 [LPC2009] 20608 RG* 17 40 38.44 -53 39 54.8     15.904     ~ 2 0
134 [LPC2009] 20820 RG* 17 40 38.90 -53 40 45.1     12.282     ~ 2 0
135 [LPC2009] 21163 RG* 17 40 39.59 -53 39 29.4     15.535     ~ 2 0
136 2MASS J17403989-5340395 RG* 17 40 39.9002936897 -53 40 39.612883070     13.033     ~ 2 0
137 [LPC2009] 21480 RG* 17 40 40.32 -53 41 25.3   16.68 16.103     ~ 6 0
138 [LPC2009] 21613 RG* 17 40 40.55 -53 40 49.7     15.242     ~ 2 0
139 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1798 1
140 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1806 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:29:10

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