2016A&A...591A..62S


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.24CET01:19:31

2016A&A...591A..62S - Astronomy and Astrophysics, volume 591A, 62-62 (2016/7-1)

The Gaia-ESO Survey: Inhibited extra mixing in two giants of the open cluster Trumpler 20?

SMILJANIC R., FRANCIOSINI E., RANDICH S., MAGRINI L., BRAGAGLIA A., PASQUINI L., VALLENARI A., TAUTVAISIENE G., BIAZZO K., FRASCA A., DONATI P., DELGADO MENA E., CASEY A.R., GEISLER D., VILLANOVA S., TANG B., SOUSA S.G., GILMORE G., BENSBY T., FRANCOIS P., KOPOSOV S.E., LANZAFAME A.C., PANCINO E., RECIO-BLANCO A., COSTADO M.T., HOURIHANE A., LARDO C., DE LAVERNY P., LEWIS J., MONACO L., MORBIDELLI L., SACCO G.G., WORLEY C.C., ZAGGIA S. and MARTELL S.

Abstract (from CDS):

Aims. We report the discovery of two Li-rich giants, with A(Li)∼1.50, in an analysis of a sample of 40 giants of the open cluster Trumpler 20 (with turnoff mass ∼1.8M). The cluster was observed in the context of the Gaia-ESO Survey.
Methods. The atmospheric parameters and Li abundances were derived using high-resolution UVES spectra. The Li abundances were corrected for nonlocal thermodynamical equilibrium (non-LTE) effects.
Results. Only upper limits of the Li abundance could be determined for the majority of the sample. Two giants with detected Li turned out to be Li rich: star MG 340 has A(Li)non–LTE=1.54±0.21dex and star MG 591 has A(Li)non–LTE=1.60±0.21dex. Star MG 340 is on average ∼0.30dex more rich in Li than stars of similar temperature, while for star MG 591 this difference is on average ∼0.80dex. Carbon and nitrogen abundances indicate that all stars in the sample have completed the first dredge-up.
Conclusions. The Li abundances in this unique sample of 40 giants in one open cluster clearly show that extra mixing is the norm in this mass range. Giants with Li abundances in agreement with the predictions of standard models are the exception. To explain the two Li-rich giants, we suggest that all events of extra mixing have been inhibited. This includes rotation-induced mixing during the main sequence and the extra mixing at the red giant branch luminosity bump. Such inhibition has been suggested in the literature to occur because of fossil magnetic fields in red giants that are descendants of main-sequence Ap-type stars.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: abundances - stars: evolution - stars: late-type - open clusters and associations: individual: Trumpler 20

Simbad objects: 45

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Number of rows : 45

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl* Trumpler 20 MG 2730 * 12 38 35.9802116037 -60 45 24.192910820 15.970 16.318 14.942   13.556 ~ 7 0
2 Cl* Trumpler 20 MG 2690 * 12 38 36.5790724888 -60 45 30.004619992 15.759 16.014 14.572   13.158 ~ 5 0
3 Cl* Trumpler 20 MG 63 * 12 38 58.0600555599 -60 30 28.567607271 15.062 15.191 13.603   12.110 ~ 6 0
4 Cl* Trumpler 20 MG 292 * 12 39 04.1071335887 -60 34 00.126293645 14.995 15.089 13.506   12.057 ~ 6 0
5 Cl* Trumpler 20 MG 1082 * 12 39 04.7696431873 -60 41 47.479933298 15.804 16.192 14.800   13.487 ~ 6 0
6 Cl* Trumpler 20 MG 724 * 12 39 07.0965699996 -60 38 05.635494342 15.979 16.364 15.018   13.744 ~ 6 0
7 GES J12391002-6038402 * 12 39 10.0352512741 -60 38 40.151618289 15.226 15.311 13.787   12.196 ~ 8 0
8 Cl* Trumpler 20 MG 582 * 12 39 11.1418012862 -60 36 52.753809599 15.949 16.281 14.923   13.628 ~ 6 0
9 Cl* Trumpler 20 MG 542 * 12 39 12.0124442082 -60 36 32.167521610 15.683 16.022 14.690   13.436 ~ 8 0
10 Cl* Trumpler 20 MG 340 * 12 39 15.7724227752 -60 34 40.598393692 15.595 16.000 14.669   13.400 ~ 9 0
11 Cl* Trumpler 20 MG 770 * 12 39 25.8484300449 -60 38 27.863831479 15.870 16.270 14.928   13.624 ~ 7 0
12 Cl* Trumpler 20 MG 950 * 12 39 26.3735043743 -60 40 21.686166213 15.865 16.215 14.831   13.503 ~ 6 0
13 Cl* Trumpler 20 MG 505 * 12 39 26.9963451918 -60 36 05.244162759 15.636 15.913 14.519   13.207 ~ 9 0
14 Cl* Trumpler 20 MG 894 * 12 39 31.3190409371 -60 39 42.270708966 15.708 16.105 14.766   13.483 ~ 7 0
15 Cl* Trumpler 20 MG 203 * 12 39 37.4134693370 -60 32 56.801925872 15.840 16.203 14.865   13.611 ~ 7 0
16 Cl* Trumpler 20 MG 835 * 12 39 37.8195801719 -60 39 05.113951963 15.636 15.957 14.577   13.268 ~ 9 0
17 Cl* Trumpler 20 MG 1010 * 12 39 40.5051570952 -60 41 00.595054308 15.689 16.038 14.643   13.289 ~ 5 0
18 Cl* Trumpler 20 MG 923 * 12 39 41.2194433599 -60 40 04.008292990 15.870 16.256 14.872   13.519 ~ 5 0
19 Cl* Trumpler 20 MG 858 * 12 39 43.0860247773 -60 39 19.223109388 15.807 16.109 14.676   13.316 ~ 6 0
20 Cl* Trumpler 20 MG 227 * 12 39 43.8614954003 -60 33 16.480258235 15.575 15.928 14.590   13.311 ~ 6 0
21 Cl* Trumpler 20 MG 346 * 12 39 44.1963452496 -60 34 41.042356146 15.776 16.070 14.704   13.388 ~ 9 0
22 Cl* Trumpler 20 MG 781 * 12 39 44.7456624627 -60 38 33.927560972 15.728 16.005 14.610   13.283 ~ 8 0
23 Cl Trumpler 20 OpC 12 39 45 -60 38.1     10.1     ~ 79 0
24 Cl* Trumpler 20 MG 768 * 12 39 45.1580703560 -60 38 25.821013938 15.845 16.169 14.789   13.473 ~ 7 0
25 GES J12394596-6038389 * 12 39 45.9499403631 -60 38 38.918258599 15.597 15.913 14.590   13.223 ~ 10 0
26 Cl* Trumpler 20 MG 287 * 12 39 46.8951094398 -60 33 54.035188610 15.781 16.127 14.781   13.480 ~ 9 0
27 Cl* Trumpler 20 MG 1008 * 12 39 47.1572785690 -60 40 58.350455728 15.398 15.555 13.949   12.447 ~ 6 0
28 Cl* Trumpler 20 MG 795 * 12 39 47.4175876452 -60 38 41.093692999 15.731 16.070 14.712   13.423 ~ 8 0
29 Cl* Trumpler 20 MG 246 * 12 39 48.9863108401 -60 33 28.196791763 15.613 15.925 14.575   13.293 ~ 7 0
30 Cl* Trumpler 20 MG 787 * 12 39 54.2557400647 -60 38 36.958046283 15.671 15.982 14.597   13.284 ~ 8 0
31 Cl* Trumpler 20 MG 638 * 12 39 55.5506508224 -60 37 26.794214345 15.676 15.994 14.613   13.299 ~ 6 0
32 Cl* Trumpler 20 MG 430 * 12 39 55.6767465175 -60 35 23.277772505 15.704 16.346 15.322   14.245 ~ 6 0
33 Cl* Trumpler 20 MG 827 * 12 39 56.5553106626 -60 39 01.208122833 15.893 16.189 14.805   13.483 ~ 5 0
34 Cl* Trumpler 20 MG 885 * 12 39 57.1178073900 -60 39 33.456071169 15.698 16.041 14.660   13.352 ~ 7 0
35 Cl* Trumpler 20 MG 399 * 12 39 59.7446615223 -60 35 07.189407761 15.729 16.043 14.618   13.254 ~ 9 0
36 Cl* Trumpler 20 PMF 6161 * 12 40 01.0987079440 -60 31 39.547710527 15.830 16.136 14.716   13.380 ~ 7 0
37 Cl* Trumpler 20 MG 429 * 12 40 01.1591422953 -60 35 21.854660624 15.679 16.008 14.615   13.302 ~ 8 0
38 Cl* Trumpler 20 MG 911 * 12 40 02.6007800298 -60 39 54.490578780 15.299 15.401 13.780   12.273 ~ 7 0
39 Cl* Trumpler 20 MG 1044 * 12 40 02.7730501473 -60 41 19.175757531 16.031 16.370 14.985   13.657 ~ 8 0
40 Cl* Trumpler 20 MG 591 * 12 40 04.5087168491 -60 36 56.582403685 15.337 15.358 13.690   12.126 ~ 7 0
41 Cl* Trumpler 20 MG 468 * 12 40 07.5529568431 -60 35 44.466131657 15.157 15.182 13.548   12.036 ~ 7 0
42 Cl* Trumpler 20 MG 679 * 12 40 22.2774929063 -60 37 41.929201779 15.823 16.160 14.743   13.379 ~ 7 0
43 Cl* Trumpler 20 MG 3470 * 12 40 24.7902633176 -60 43 10.236082966 15.363 15.521 13.922   12.414 ~ 7 0
44 NGC 6633 OpC 18 27 31.2 +06 34 12           ~ 331 0
45 NAME Galactic Bulge reg ~ ~           ~ 3518 0

    Equat.    Gal    SGal    Ecl

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2021.01.24-01:19:31

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