2011A&A...527A..94C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:46:56

2011A&A...527A..94C - Astronomy and Astrophysics, volume 527A, 94-94 (2011/3-1)

Lithium abundances and extra mixing processes in evolved stars of M 67.

CANTO MARTINS B.L., LEBRE A., PALACIOS A., DE LAVERNY P., RICHARD O., MELO C.H.F., DO NASCIMENTO J.D.Jr and DE MEDEIROS J.R.

Abstract (from CDS):

We present a spectroscopic analysis of a sample of evolved stars in M67 (turn-off, subgiant and giant stars) in order to bring observational constraints to evolutionary models taking into account non-standard transport processes. We determined the stellar parameters (Teff, logg, [Fe/H]), microturbulent and rotational velocities and, lithium abundances (ALi) for 27 evolved stars of M67 with the spectral synthesis method based on MARCS model atmospheres. We also computed non-standard stellar evolution models, taking into account atomic diffusion and rotation-induced transport of angular momentum and chemicals that were compared with this set of homogeneous data. The lithium abundances that we derive for the 27 stars in our sample follow a clear evolutionary pattern ranging from the turn-off to the Red Giant Branch. Our abundance determination confirms the well known decrease of lithium content for evolved stars. For the first time, we provide a consistent interpretation of both the surface rotation velocity and of the lithium abundance patterns observed in an homogeneous sample of TO and evolved stars of M67. We show that the lithium evolution is determined by the evolution of the angular momentum through rotation-induced mixing in low-mass stars, in particular for those with initial masses larger than 1.30M when at solar metallicity.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: fundamental parameters - stars: atmospheres - stars: evolution

Simbad objects: 32

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Number of rows : 32

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 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2654 0
2 NGC 2682 20 V* 08 50 49.9468814917 +11 49 12.773279778 14.186 13.78 12.889   11.998 G8V 42 0
3 NGC 2682 46 Ro* 08 51 00.1707001809 +11 54 32.147054160 13.991 13.541 12.764   11.889 G5IV 41 0
4 NGC 2682 84 RG* 08 51 12.6931812504 +11 52 42.448865345   11.629 10.393 10.234 9.500 K1III 102 0
5 NGC 2682 105 RG* 08 51 17.0998688216 +11 48 16.177322855   11.554 10.316 9.942 9.07 K2III 122 0
6 NGC 2682 108 RG* 08 51 17.4856199463 +11 45 22.709284546   11.064 9.603 9.370 8.36 ~ 110 1
7 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
8 NGC 2682 115 V* 08 51 18.5413357444 +11 49 21.514285478 13.309 13.26 12.645 12.274 11.924 F9IV 64 0
9 NGC 2682 141 RG* 08 51 22.8037504415 +11 48 01.780643224   11.570 10.346 10.180 9.40 ~ 119 0
10 NGC 2682 144 SB* 08 51 23.8037837055 +11 47 16.088731083 13.914 13.62 12.835   11.981 G4IV 22 0
11 NGC 2682 164 RG* 08 51 28.9911734176 +11 50 33.129974313   11.675 10.441 10.250 9.46 K1III 114 0
12 NGC 2682 166 * 08 51 29.3543895938 +11 45 27.649101311 14.413 13.85 12.910   11.962 K0IV 51 0
13 NGC 2682 181 * 08 51 32.4022460532 +11 48 01.228485951 13.931 13.60 12.830 12.360 11.895 F5IV 20 0
14 NGC 2682 182 * 08 51 32.4465225192 +11 47 52.381433575 13.335 13.27 12.738 12.294 11.920 G0V 23 0
15 NGC 2682 192 V* 08 51 35.4047689388 +11 57 56.557123197 13.879 13.583 12.817     G2IV 28 0
16 NGC 2682 193 RG* 08 51 35.7787389120 +11 53 34.750825194 13.904 13.22 12.267   11.228 K0III 77 0
17 NGC 2682 195 SB* 08 51 36.0099994276 +11 46 33.605594679 13.539 13.4 12.682 12.328 11.915 G1V 43 0
18 NGC 2682 202 V* 08 51 37.4062316298 +11 50 05.309567072 13.268 13.15 12.608   11.874 F9IV 26 0
19 NGC 2682 210 * 08 51 39.2309747379 +11 50 03.854655086 12.866 12.79 12.277   11.566 F8V 36 0
20 Cl* NGC 2682 ES III-35 RG* 08 51 39.3859622341 +11 51 45.672923357 13.832 13.1 12.117   11.078 K0III 48 0
21 NGC 2682 218 RG* 08 51 42.3411374693 +11 50 07.681109985   12.71 11.48     K1III 46 0
22 NGC 2682 217 RG* 08 51 42.3635293595 +11 51 23.076710195   12.80 11.23     K1III 61 0
23 NGC 2682 226 * 08 51 44.0075673304 +11 46 24.536468173 13.749 13.549 12.790   11.928 G0 51 0
24 NGC 2682 227 RB? 08 51 44.7392406102 +11 46 46.049130453 14.402 13.898 13.000   11.994 K0IV 43 0
25 NGC 2682 231 RG* 08 51 45.0772181969 +11 47 45.974219749   12.57 11.468     K1III 85 0
26 NGC 2682 237 * 08 51 48.8384728421 +11 56 51.248326946 14.453 13.82 12.982     K0IV 24 0
27 NGC 2682 243 Ro* 08 51 49.9490256108 +11 49 31.201271609 13.331 13.23 12.675   11.913 F8 37 0
28 NGC 2682 272 * 08 52 04.7512168572 +11 58 29.083547309   13.27 12.716     ~ 14 0
29 NGC 2682 281 V* 08 52 11.3482081962 +11 45 37.977382218 14.016 13.734 12.951   12.019 G5IV 27 0
30 NGC 2682 289 V* 08 52 21.4005628439 +11 50 41.846963069   13.18 12.707     ~ 18 0
31 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2131 0
32 IC 4651 OpC 17 24 49 -49 56.0           ~ 309 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:46:56

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