2015A&A...579A.122A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST03:14:36

2015A&A...579A.122A - Astronomy and Astrophysics, volume 579A, 122-122 (2015/7-1)

Convective settling in main sequence stars: Li and Be depletion.

ANDRASSY R. and SPRUIT H.C.

Abstract (from CDS):

The process of convective settling is based on the assumption that a small fraction of the low-entropy downflows sink from the photosphere down to the bottom of the star's envelope convection zone retaining a substantial entropy contrast. We have previously shown that this process could explain the slow Li depletion observed in the Sun. We construct a parametric model of convective settling to investigate the dependence of Li and Be depletion on stellar mass and age. Our model is generally in good agreement with the Li abundances measured in open clusters and solar twins, although it seems to underestimate the Li depletion in the first ∼1Gyr. The model is also compatible with the Be abundances measured in a sample of field stars.

Abstract Copyright:

Journal keyword(s): convection - stars: evolution - stars: abundances

Simbad objects: 11

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Number of rows : 11

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 752 OpC 01 57 41 +37 47.1           ~ 537 0
2 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 750 0
3 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2979 0
4 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2654 0
5 HD 101364 PM* 11 40 28.4842891594 +69 00 30.600485781   9.32 8.67     G5 64 0
6 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 389 1
7 * 18 Sco PM* 16 15 37.2703721200 -08 22 09.981989277   6.15 5.50     G2Va 484 0
8 IC 4651 OpC 17 24 49 -49 56.0           ~ 309 0
9 NGC 6633 OpC 18 27 31.2 +06 34 12           ~ 323 0
10 HD 197027 PM* 20 41 54.6337513102 -27 12 57.415448921   9.80 9.15     G3V 49 0
11 HD 218544 PM* 23 09 16.6208994786 -40 59 28.313116573   9.41 8.73     G3V 22 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-03:14:36

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