2016A&A...594A..79S


Query : 2016A&A...594A..79S

2016A&A...594A..79S - Astronomy and Astrophysics, volume 594A, 79-79 (2016/10-1)

Abundances in a sample of turnoff and subgiant stars in NGC 6121 (M 4).

SPITE M., SPITE F., GALLAGHER A.J., MONACO L., BONIFACIO P., CAFFAU E. and VILLANOVA S.

Abstract (from CDS):

Context. The stellar abundances observed in globular clusters show complex structures, currently not yet understood.
Aims. The aim of this work is to investigate the relations between the abundances of different elements in the globular cluster M 4, selected for its uniform deficiency of iron, to explore the best models explaining the pattern of these observed abundances. Moreover, in turnoff stars, the abundances of the elements are not suspected to be affected by internal mixing.
Methods. In M 4, using low and moderate resolution spectra obtained for 91 turnoff (and subgiant) stars with the ESO FLAMES-Giraffe spectrograph, we have extended previous measurements of abundances (of Li, C and Na) to other elements (C, Si, Ca, Sr and Ba), using model atmosphere analysis. We have also studied the influence of the choice of the microturbulent velocity.
Results. Firstly, the peculiar turnoff star found to be very Li-rich in a previous paper does not show any other abundance anomalies relative to the other turnoff stars in M 4. Secondly, an anti-correlation between C and Na has been detected, the slope being significative at more than 3σ. This relation between C and Na is in perfect agreement with the relation found in giant stars selected below the RGB bump. Thirdly, the strong enrichment of Si and of the neutron-capture elements Sr and Ba, already observed in the giants in M 4, is confirmed. Finally, the relations between Li, C, Na, Sr and Ba constrain the enrichment processes of the observed stars.
Conclusions. The abundances of the elements in the turnoff stars appear to be compatible with production processes by massive AGBs, but are also compatible with the production of second generation elements (like Na) and low Li produced by, for example, fast rotating massive stars.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: abundances - Galaxy: abundances - globular clusters: individual: M 4 - Galaxy: halo

VizieR on-line data: <Available at CDS (J/A+A/594/A79): table3.dat table4.dat>

Simbad objects: 94

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Number of rows : 94
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 [MVB2012] 34383 * 16 22 49.0933099776 -26 26 45.985837776           ~ 2 0
2 2MASS J16225071-2629027 * 16 22 50.715 -26 29 02.75           ~ 3 0
3 2MASS J16230338-2621583 * 16 23 03.3763196808 -26 21 58.385091384           ~ 3 0
4 2MASS J16230569-2622496 * 16 23 05.6854870512 -26 22 49.687431744           ~ 3 0
5 2MASS J16230786-2628378 * 16 23 07.86624 -26 28 37.8480           ~ 3 0
6 2MASS J16230858-2629082 * 16 23 08.5718677560 -26 29 08.352785724   18.863 17.841     ~ 4 0
7 2MASS J16231013-2627558 * 16 23 10.1308515720 -26 27 55.906658784           ~ 3 0
8 2MASS J16231037-2629305 * 16 23 10.3602620784 -26 29 30.753628044   18.090 17.262     ~ 4 0
9 2MASS J16231146-2631005 * 16 23 11.4591282576 -26 31 00.684002136   17.367 16.328     ~ 4 0
10 2MASS J16231156-2638135 * 16 23 11.5611572832 -26 38 13.658685360   17.416 16.559     ~ 4 0
11 UCAC4 318-088092 PM* 16 23 12.0679427496 -26 32 15.208984716   17.219 16.141     ~ 4 0
12 2MASS J16231277-2631445 * 16 23 12.776 -26 31 44.55   17.211 16.163     ~ 4 0
13 2MASS J16231309-2635032 * 16 23 13.098 -26 35 03.25           ~ 3 0
14 2MASS J16231332-2631251 * 16 23 13.3260957936 -26 31 25.186420956   17.698 16.845     ~ 4 0
15 2MASS J16231370-2638570 * 16 23 13.7080918128 -26 38 57.218015040   17.642 16.817     ~ 4 0
16 2MASS J16231375-2629499 * 16 23 13.7494787256 -26 29 50.120683584   17.643 16.806     ~ 4 0
17 2MASS J16231378-2628422 * 16 23 13.7919234456 -26 28 42.387138984   18.189 17.163     ~ 4 0
18 2MASS J16231390-2628133 * 16 23 13.9128635856 -26 28 13.327831488   18.033 17.155     ~ 4 0
19 2MASS J16231443-2633069 * 16 23 14.4357011592 -26 33 06.900984720   17.651 16.820     ~ 4 0
20 2MASS J16231502-2630019 * 16 23 15.0230146056 -26 30 01.994617584   17.343 16.437     ~ 4 0
21 2MASS J16231507-2629199 * 16 23 15.0823570464 -26 29 20.016528360   17.675 16.837     ~ 4 0
22 2MASS J16231539-2628080 * 16 23 15.399 -26 28 08.08           ~ 3 0
23 2MASS J16231582-2633424 * 16 23 15.8218005024 -26 33 42.434194392   17.481 16.635     ~ 4 0
24 2MASS J16231592-2634062 * 16 23 15.9199451952 -26 34 06.371127660   17.360 16.481     ~ 4 0
25 2MASS J16231648-2628492 * 16 23 16.4811136656 -26 28 49.279736100   17.313 16.404     ~ 4 0
26 2MASS J16231942-2638576 * 16 23 19.4247426432 -26 38 57.872787036           ~ 3 0
27 2MASS J16232013-2638344 * 16 23 20.1307263072 -26 38 34.630955808   17.340 16.528     ~ 4 0
28 2MASS J16232059-2626222 * 16 23 20.5907101920 -26 26 22.332747480   17.636 16.779     ~ 4 0
29 2MASS J16232128-2624529 * 16 23 21.281 -26 24 52.95           ~ 3 0
30 2MASS J16232173-2635527 * 16 23 21.7331227704 -26 35 52.833120720   17.432 16.518     ~ 4 0
31 2MASS J16232202-2636577 * 16 23 22.0305318336 -26 36 57.886386192   17.664 16.826     ~ 4 0
32 2MASS J16232216-2626223 * 16 23 22.165 -26 26 22.34   17.594 16.706     ~ 4 0
33 2MASS J16232244-2624493 * 16 23 22.4466358584 -26 24 49.458372012           ~ 3 0
34 2MASS J16232335-2636020 * 16 23 23.3700081288 -26 36 02.224794780   17.666 16.812     ~ 4 0
35 2MASS J16232371-2637422 * 16 23 23.7124411152 -26 37 42.319847820   18.041 17.238     ~ 6 0
36 2MASS J16232377-2626489 * 16 23 23.7809124432 -26 26 48.964252776   17.146 16.065     ~ 4 0
37 [BH2018] J245.849125-26.415222 * 16 23 23.7901102464 -26 24 54.857572056   17.629 16.779     ~ 4 0
38 2MASS J16232405-2626373 * 16 23 24.0584844936 -26 26 37.369083264   17.448 16.535     ~ 4 0
39 2MASS J16232432-2636152 * 16 23 24.3297799752 -26 36 15.370121376   17.653 16.813     ~ 4 0
40 [MVB2012] 56218 * 16 23 25.0221057600 -26 27 19.726405524           ~ 2 0
41 2MASS J16232509-2638456 * 16 23 25.0954255872 -26 38 45.778288488   17.457 16.546     ~ 4 0
42 2MASS J16232706-2626321 * 16 23 27.0692909592 -26 26 32.232022116   17.760 16.907     ~ 4 0
43 2MASS J16232720-2638383 * 16 23 27.2075454360 -26 38 38.398461504   17.588 16.685     ~ 4 0
44 2MASS J16232721-2636599 * 16 23 27.2124918600 -26 37 00.082064244   17.309 16.317     ~ 4 0
45 2MASS J16232874-2637000 * 16 23 28.7433709824 -26 37 00.161808852   17.531 16.668     ~ 4 0
46 2MASS J16232879-2640268 * 16 23 28.7968028112 -26 40 27.031308312   17.639 16.773     ~ 4 0
47 2MASS J16232959-2624091 * 16 23 29.5997395464 -26 24 09.191995092   17.560 16.666     ~ 4 0
48 2MASS J16233036-2626029 * 16 23 30.369 -26 26 02.96   17.751 16.888     ~ 4 0
49 2MASS J16233081-2637156 * 16 23 30.8179187472 -26 37 15.902251536   17.598 16.744     ~ 4 0
50 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1841 0
51 2MASS J16233533-2626091 * 16 23 35.3397500568 -26 26 09.150610236   17.613 16.748     ~ 4 0
52 2MASS J16233587-2638376 * 16 23 35.8805840208 -26 38 37.862093724   17.313 16.285     ~ 4 0
53 [BH2018] J245.901417-26.618389 * 16 23 36.34 -26 37 06.2           ~ 3 0
54 2MASS J16233646-2621402 * 16 23 36.4670320392 -26 21 40.262367276   17.651 16.783     ~ 4 0
55 2MASS J16233706-2638583 * 16 23 37.0636434576 -26 38 58.635544848   17.641 16.805     ~ 4 0
56 2MASS J16233935-2622401 * 16 23 39.3575434584 -26 22 40.264278312   17.484 16.618     ~ 4 0
57 2MASS J16234047-2639194 * 16 23 40.4776240632 -26 39 19.638635256   17.494 16.649     ~ 4 0
58 2MASS J16234083-2636560 * 16 23 40.8346634256 -26 36 56.157121692   17.606 16.765     ~ 4 0
59 2MASS J16234092-2640118 * 16 23 40.9266509664 -26 40 12.019535904   17.662 16.835     ~ 4 0
60 [MVB2012] 9254 * 16 23 41.9226412440 -26 20 18.947841504           ~ 2 0
61 2MASS J16234246-2625596 * 16 23 42.463 -26 25 59.66   17.262 16.425     ~ 4 0
62 2MASS J16234305-2626105 * 16 23 43.0531049040 -26 26 10.519215180   17.599 16.784     ~ 5 0
63 [MVB2012] 9280 * 16 23 44.0567549208 -26 20 13.075112580           ~ 2 0
64 2MASS J16234560-2637112 * 16 23 45.5922584472 -26 37 11.220279528   17.826 16.984     ~ 4 0
65 2MASS J16234646-2637042 * 16 23 46.4646467040 -26 37 04.318174992   17.625 16.800     ~ 4 0
66 2MASS J16234658-2626547 * 16 23 46.5798475152 -26 26 54.782802240   17.451 16.644     ~ 4 0
67 2MASS J16234691-2633203 * 16 23 46.9230651264 -26 33 20.460506688   17.648 16.828     ~ 4 0
68 2MASS J16234725-2626057 * 16 23 47.2453218192 -26 26 05.858752092   17.445 16.640     ~ 4 0
69 2MASS J16234795-2622499 * 16 23 47.9559951864 -26 22 50.036857104   17.469 16.636     ~ 4 0
70 2MASS J16234866-2623350 * 16 23 48.6566569464 -26 23 35.236307076   17.454 16.614     ~ 4 0
71 [MVB2012] 9505 * 16 23 48.9001674672 -26 19 26.799894444           ~ 2 0
72 [MVB2012] 9139 * 16 23 49.0560814680 -26 20 40.967236932           ~ 2 0
73 2MASS J16234967-2625265 * 16 23 49.6687615224 -26 25 26.590760544   17.461 16.650     ~ 4 0
74 2MASS J16235943-2635060 * 16 23 59.4369267624 -26 35 05.979559056   17.780 16.967     ~ 4 0
75 UCAC4 318-089774 * 16 24 01.8184423680 -26 32 24.664149780   17.496 16.710 16.38   ~ 4 0
76 2MASS J16240379-2631174 * 16 24 03.7929838368 -26 31 17.522548608   17.559 16.764     ~ 4 0
77 2MASS J16240587-2634243 * 16 24 05.8764534888 -26 34 24.252284496   17.680 16.849     ~ 4 0
78 2MASS J16240750-2635365 * 16 24 07.5086351664 -26 35 36.547265976   17.831 16.979     ~ 4 0
79 2MASS J16240832-2631021 * 16 24 08.3331444384 -26 31 02.181592812   17.480 16.681     ~ 4 0
80 2MASS J16240905-2632568 * 16 24 09.0536281656 -26 32 56.845252572   17.713 16.898     ~ 4 0
81 [BH2018] J246.039333-26.515500 * 16 24 09.44 -26 30 55.8   17.490 16.683     ~ 4 0
82 2MASS J16240992-2630088 * 16 24 09.926 -26 30 08.87           ~ 3 0
83 2MASS J16241125-2631287 * 16 24 11.2617468408 -26 31 28.809077808   17.318 16.459     ~ 4 0
84 2MASS J16241261-2622283 * 16 24 12.6030378744 -26 22 28.463876724           ~ 3 0
85 2MASS J16241309-2623346 * 16 24 13.1017192752 -26 23 34.658578788           ~ 3 0
86 2MASS J16241726-2628360 * 16 24 17.2679121912 -26 28 36.022913940   17.455 16.660     ~ 4 0
87 2MASS J16241772-2629470 * 16 24 17.7271023600 -26 29 47.091877620   17.620 16.815     ~ 4 0
88 2MASS J16241938-2627243 * 16 24 19.3795120176 -26 27 24.364295064           ~ 3 0
89 [MVB2012] 66304 * 16 24 20.045 -26 30 36.57           ~ 2 0
90 [MVB2012] 67707 * 16 24 20.2874603952 -26 28 03.308190708           ~ 2 0
91 [MVB2012] 65939 * 16 24 21.136 -26 31 17.31           ~ 2 0
92 [MVB2012] 67796 * 16 24 22.2543802344 -26 27 51.582917520           ~ 2 0
93 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1965 0
94 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 1988 0

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