2016A&A...587A.100C


Query : 2016A&A...587A.100C

2016A&A...587A.100C - Astronomy and Astrophysics, volume 587A, 100-100 (2016/3-1)

Correlation between lithium abundances and ages of solar twin stars.

CARLOS M., NISSEN P.E. and MELENDEZ J.

Abstract (from CDS):

We want to determine the lithium abundances of solar twin stars as a function of stellar age to provide constraints for stellar evolutions models and to investigate whether there is a connection between low Li abundance and the occurrence of planets. For a sample of 21 solar twins observed with the HARPS spectrograph at high spectral resolution (R≃115.000) and very high signal-to-noise ratio (600≤S/N≤2400), precise lithium abundances were obtained by spectral synthesis of the LiI 6707.8Å line and compared to stellar ages, masses, and metallicities determined from a spectroscopic analysis of the same set of HARPS spectra. We show that for the large majority of the solar twins there is a strong correlation between lithium abundance and stellar age. As the age increases from 1 to 9Gyr, the Li abundance decreases by a factor of ∼50. The relation agrees fairly well with predictions from non-standard stellar evolution models of Li destruction at the bottom of the upper convection zone. Two stars deviate from the relation by having Li abundances enhanced by a factor of ∼10, which may be due to planet engulfment. On the other hand, we find no indication of a link between planet hosting stars and enhanced lithium depletion.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: evolution - planetary systems

Simbad objects: 27

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Number of rows : 27
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 HD 2071 PM* 00 24 42.5485223710 -53 59 02.396695788   7.95 7.27     G2V 74 0
2 HD 8406 PM* 01 23 00.8734798539 -16 29 14.861814008   8.58 7.93     G3V 64 0
3 HD 20782 PM* 03 20 03.5777409770 -28 51 14.660409684   8.03 7.38     G1.5V 168 1
4 HD 27063 PM* 04 16 30.2413232322 -00 34 22.093539462   8.71 8.07     G3V 70 0
5 HD 28471 PM* 04 25 09.1511840948 -64 04 48.254275681   8.56 7.91     G5V 71 0
6 HD 38277 PM* 05 44 17.5968951733 -10 01 00.231404253   7.73 7.12     G1V 62 0
7 HD 45289 PM* 06 24 24.3504406831 -42 50 51.065016406   7.35 6.67     G2V 121 0
8 HD 45184 PM* 06 24 43.8797456693 -28 46 48.416253741   7.01 6.39 6.24 8.94 G2Va 171 1
9 HD 71334 PM* 08 25 49.5157058164 -29 55 50.130492534   8.49 7.82     G2.5V 111 0
10 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2109 0
11 HD 78429 PM* 09 06 38.8310540540 -43 29 31.117055567   7.93 7.33     G2V 107 0
12 HD 88084 PM* 10 09 08.2458432506 -15 29 40.190519050   8.18 7.54     G2V 68 0
13 HD 92719 PM* 10 42 13.3208450312 -13 47 15.767668830 7.519 7.406 6.767 6.42 6.083 G1.5V 92 0
14 HD 96116 * 11 04 13.6517787336 -57 45 54.473448673   9.34 8.69     G3V 54 0
15 HD 96423 PM* 11 06 19.7446501611 -44 22 23.939505002   7.92 7.23     G5V 86 0
16 HD 101364 PM* 11 40 28.4842891594 +69 00 30.600485781   9.32 8.67     G5 68 0
17 HD 134664 PM* 15 12 10.3535587878 -30 53 10.651147031   8.40 7.73     G1.5V 82 0
18 * 18 Sco PM* 16 15 37.2703721200 -08 22 09.981989277   6.15 5.50     G2Va 515 0
19 HD 183658 PM* 19 30 52.7191481247 -06 30 51.925192506   7.93 7.28     G3V 96 0
20 * 16 Cyg A ** 19 41 48.9539315338 +50 31 30.218780803 6.79 6.59 5.95 5.50 5.17 G1.5Vb 693 1
21 * 16 Cyg B PM* 19 41 51.9731830550 +50 31 03.086127222 7.07 6.86 6.20 5.76 5.42 G3V 815 1
22 HD 197027 PM* 20 41 54.6337513102 -27 12 57.415448921   9.80 9.15     G3V 57 0
23 HD 208704 PM* 21 58 24.3257845018 -12 39 52.777483342   7.77 7.17     G1V 73 0
24 HD 210918 PM* 22 14 38.65336 -41 22 53.9866 7.02 6.88 6.23     G2V 184 0
25 HD 218544 PM* 23 09 16.6208994785 -40 59 28.313116573   9.41 8.73     G3V 26 0
26 HD 220507 PM* 23 24 42.1153597453 -52 42 06.761247344   8.28 7.58     G5V 86 0
27 HD 222582 PM* 23 41 51.5299950324 -05 59 08.731514665   8.34 7.69     G5V 206 2

    Equat.    Gal    SGal    Ecl

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2021.07.25-18:33:25

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