2001A&A...369..871F


Query : 2001A&A...369..871F

2001A&A...369..871F - Astronomy and Astrophysics, volume 369, 871-881 (2001/4-3)

Lithium in the Coma Berenices open cluster.

FORD A., JEFFRIES R.D., JAMES D.J. and BARNES J.R.

Abstract (from CDS):

Lithium abundances, radial velocities, and rotational velocities are reported for 20 candidate F, G and K stars of the sparse Coma Berenices open cluster. All the stars are proper-motion selected, and our radial velocities support the membership credentials of at least 12 of the candidates. Combining our data with that in the literature, we have a close-to-complete census of Li abundances for late-type stars with MV<5.8. These data show that the Li-depletion pattern in Coma Ber is similar, but not identical, to that in the Hyades cluster, which has a similar age but higher metallicity. Several Coma Ber F stars have suffered significantly more Li depletion than their counterparts in the Hyades. The G and early-K stars of Coma Ber have undergone less Li depletion than those of the Hyades, but much more than that predicted by standard evolutionary models featuring only convective mixing. This provides strong evidence for additional mixing and Li depletion operating in these stars during their first 400Myr on the main sequence, amounting to 0.3dex at 6000K and rising to 0.8-1.2dex at 5400K. We find that 4 of the radial-velocity non-members are among a small number of low-mass stars which were previously reported as part of an extra-tidal moving group associated with the Coma Ber cluster. As a result, we now find that the luminosity function of this moving group is indistinguishable from that of the central cluster. It is uncertain whether there may be a significant number of stars with even lower masses among the moving group.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: late type - stars: interiors - open clusters and associations: individual: Coma Berenices

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * 6 Cet PM* 00 11 15.8580395472 -15 28 04.720468404 5.35 5.38 4.89     F8VFe-0.8CH-0.5 298 0
2 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 798 0
3 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3208 0
4 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2861 0
5 HD 32963 PM* 05 07 55.7640826464 +26 19 40.674925236   8.22 7.59     G5IV 96 0
6 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2191 0
7 HD 105863 * 12 11 07.3820881128 +25 59 24.629771616   10.18 9.55     F8.2 31 0
8 HD 107132 V* 12 19 01.4794667088 +24 50 46.186912968   9.26 8.81     F7Vv 79 0
9 Cl Melotte 111 203 * 12 19 16.2564723528 +25 26 10.459129956   11.68 10.8     G9V 15 0
10 HD 107399 * 12 20 45.5706181896 +25 45 57.104302932   9.62 9.00     F8V 97 0
11 HD 107611 * 12 21 56.1616739640 +27 18 34.236329472   8.95 8.50     F6V 99 0
12 HD 107701 * 12 22 31.3799046648 +25 49 42.549271536   9.14 8.61     F8V 67 0
13 BD+27 2121 SB* 12 23 41.8281760152 +26 36 05.398555248   9.93 9.34     G5.5 43 0
14 Cl Melotte 111 OpC 12 24 03 +25 39.1           ~ 442 0
15 BD+26 2342 * 12 24 05.7338390664 +26 07 42.918489804   11.26 10.46     ~ 38 0
16 BD+27 2130 SB* 12 26 05.4870 +26 44 38.304   10.60 9.79     K1.6 25 0
17 Cl Melotte 111 132 * 12 27 06.2628222120 +26 50 44.499013044   10.59 9.91 9.59 9.31 ~ 44 0
18 BD+29 2290 * 12 27 48.2946577200 +28 11 39.891263784   10.40 9.6     G5.4 26 0
19 2MASS J12275265+2505449 RG* 12 27 52.6643422128 +25 05 44.912908176   12.00 11.2     G6 11 0
20 BD+28 2119 * 12 28 21.1109962896 +28 02 26.086057476   11.24 10.43     G7IV: 18 0
21 BD+27 2139 * 12 28 56.4263196744 +26 32 57.395882868   11.67 10.8 10.53 10.25 G9IV 29 0
22 V* HZ Com RS* 12 29 40.9243367712 +24 31 14.635606188   10.58 9.76     G8:V 68 0
23 HIP 61012 * 12 30 14.0984884752 +25 01 42.249351144   11.17 10.4     G7V 17 0
24 BD+36 2278 * 12 32 31.0724294328 +35 19 52.311815004   10.14 9.7     G0 35 0
25 HD 109483 * 12 34 54.2985164088 +27 27 20.207769624   9.60 9.0     G4.8 29 0
26 BD+36 2312 * 12 50 39.2993332080 +35 55 38.368041060   11.23 10.5     G6III 6 0
27 HD 111878 * 12 52 11.6160381936 +25 22 24.579304968   9.35 8.83 8.6   F8V 48 0
28 HD 114400 * 13 09 55.2637741464 +33 43 18.706075572   10.27 9.54     G0 20 0
29 TYC 2534-1715-1 * 13 11 28.0555406616 +33 46 50.761041816   11.29 10.54     ~ 3 0
30 BD+21 2514 * 13 18 47.0169764088 +20 15 04.369660848   10.86 10.08 10.006   G5 8 0
31 BD+38 2436 * 13 21 11.1902844504 +37 48 48.764162592   9.60 9.10     M2 12 0
32 BD+16 2505 * 13 24 38.0189111376 +16 02 19.254096996   10.25 9.64     G0 4 0
33 BD+25 2631 * 13 24 41.3796058416 +24 45 40.244207328   11.3 10.49     ~ 6 0
34 HD 126053 PM* 14 23 15.2847745835 +01 14 29.641269692 6.98 6.90 6.27 5.71 5.39 G1.5V 386 0
35 * iot Psc PM* 23 39 57.0413764 +05 37 34.647529 4.640 4.620 4.120 3.68 3.37 F7V 599 0

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2022.08.16-05:23:20

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