2012A&A...537A..91X


Query : 2012A&A...537A..91X

2012A&A...537A..91X - Astronomy and Astrophysics, volume 537A, 91-91 (2012/1-1)

Lithium abundances of nearby young solar-type stars based on optical high-resolution spectroscopy.

XING L.-F. and XING Q.-F.

Abstract (from CDS):

Lithium has long been recognized as a powerful tool for investigating the internal mixing of low-mass stars. In addition, accurate measurements of lithium abundances in young solar-type stars provide independent and reliable age diagnostics. To study the relationship between lithium and activity in normal solar type-type stars and determine the effectiveness of lithium and kinematics as activity indicators, we perform a lithium survey of nearby late-type stars. We search for nearby young solar-type stars and investigate the relationship between lithium abundances and X-ray activity by measuring logLx. On the basis of high-resolution spectroscopic observations, we derived the lithium abundances of 33 young solar-type stars by comparing the measured LiI λ 670.8nm equivalent widths with the curve of growth calculations in non-LTE (NLTE) conditions. We obtain the lithium abundances of a sample of young solar-type stars. Using the lithium abundance and X-ray luminosity, Lx, we investigate the relationship between Li abundance and X-ray activity. We find a clear correlation between lithium abundance (logN(Li)) and X-ray luminosity, logLx, for our sample stars. As the X-ray luminosity, Lx, becomes stronger, the lithium abundance decreases in our sample (11 pre-main-sequence, 15 zero-age-main-sequence, and 7 young main-sequence) stars. The results imply that there is a large number of solar-type stars. A correlation appears to exist between Li abundance and age, thus confirming the presence of very active young stars close to the Sun.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: abundances - stars: solar-type

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 BD+61 119 PM* 00 34 38.3081633376 +62 37 19.629250104   9.53 8.98     G1V 20 0
2 RX J0156.4+1224 PM* 01 56 27.5949975048 +12 24 49.056617844   11.12 10.620   9.700 G 11 0
3 BD+30 397 PM* 02 27 29.2543096632 +30 58 24.596323968   11.3 10.12 9.32 8.78 K7V 107 1
4 HD 17662 PM* 02 50 30.1776181920 +11 52 12.355223916   9.22 8.44     G5 25 0
5 V* V686 Per BY* 03 20 59.4527133888 +33 13 05.974467636       7.5   K0V 38 0
6 HD 21051 TT* 03 24 10.1286587232 +12 37 46.532952372   7.246 6.046     K0III-IV 50 0
7 Cl Melotte 20 OpC 03 26 28.1 +48 58 30           ~ 861 0
8 HD 21845 PM* 03 33 13.4905810704 +46 15 26.546978484   8.963 8.250 7.8 7.34 K2 93 0
9 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3437 0
10 HD 232862 ** 03 57 19.967736 +50 51 18.56412   10.47 9.58 9.36   K2V 27 0
11 HD 26913 BY* 04 15 25.7871375264 +06 11 58.751401236 7.790 7.580 6.920 6.554 6.195 G8V 218 0
12 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3082 0
13 V* V1319 Tau TT* 04 30 49.1855896920 +21 14 10.654195380   11.07 10.24 9.82 9.465 G8 36 0
14 HD 285840 TT* 04 32 42.4331784912 +18 55 10.200928476   11.52 10.848   9.711 K1V: 44 0
15 V* V1110 Tau RS* 04 34 39.2797655376 +25 01 01.016239440   11.14 10.308   9.141 G0 58 0
16 HD 31281 TT* 04 55 09.6199331136 +18 26 31.105838832   9.83 9.14 9.12   G1V: 39 0
17 HD 32704 SB* 05 04 57.5421470520 -03 54 52.803480348   9.41 8.539   7.566 G6IV 12 0
18 IRAS 05281+0257 Y*O 05 30 47.8177213560 +02 59 37.903058232           ~ 14 0
19 HD 287927 V* 05 30 48.0178638648 +02 59 34.619407332   11.49 10.72 10.47 9.765 F2 14 0
20 HD 245924 TT* 05 39 30.9375019856 +23 06 32.756518341   10.41 9.57 9.48 8.482 K0IV 20 0
21 HD 251108 Ro* 06 04 14.9929371672 +12 45 51.088959756   11.25 9.899   8.520 K2 11 0
22 V* FP Cnc BY* 08 08 56.3432557032 +32 49 11.565438636       9.578   K6V 75 0
23 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 822 0
24 HD 79551 PM* 09 16 18.2008619688 +44 55 26.091711912       8.4   G5 22 0
25 HD 81025 ** 09 24 55.67898 +51 34 26.0255   7.142 6.368     G2III 45 0
26 * d UMa RS* 09 34 28.8594727848 +69 49 49.226541888 5.67 5.34 4.57 3.91 3.50 G5III-IV 300 0
27 IC 2602 OpC 10 42 27.1 -64 25 34           ~ 675 0
28 V* GZ Leo RS* 11 02 02.2678369872 +22 35 45.488085612   9.82 8.880   7.910 K0Ve+K0Ve 48 0
29 BD+12 2343 SB* 11 32 49.4245288344 +12 10 24.938881464   10.13 9.38     G5 19 0
30 * 61 UMa PM* 11 41 03.0162706212 +34 12 05.881605449 6.31 6.08 5.34 4.73 4.38 G8V 612 0
31 HD 111395 BY* 12 48 47.0481446766 +24 50 24.818642182   6.98   5.8   G5V 187 0
32 V* RS CVn RS* 13 10 36.9077924448 +35 56 05.584994412 8.57 8.51 7.93 7.7   F6IV+G8IV 725 0
33 BD+23 2581 ** 13 32 41.6858519142 +22 30 06.809284189   10.65 9.622 9.0 8.381 KV:e 35 0
34 * phi Vir PM* 14 28 12.1389021744 -02 13 40.649015856   5.522 4.840     G2IV 192 0
35 * i Boo EB* 15 03 47.29565 +47 39 14.6228           G0Vn 544 0
36 * lam Ser PM* 15 46 26.6142121632 +07 21 11.047378824 5.13 5.03 4.42 3.92 3.60 G0-V 574 0
37 V* BY Dra BY* 18 33 55.7720712062 +51 43 08.897780286 10.22 9.23   8.733   K4Ve+K7.5Ve 621 0
38 HD 340540 PM* 20 35 56.5723060728 +27 42 40.186989072   10.09 9.08     K0 9 0
39 V* V383 Lac BY* 22 20 07.0254050808 +49 30 11.767337496   9.42 8.58     K1V 77 0
40 BD+66 1664 SB* 23 58 10.6721570184 +67 33 59.717354256   9.42 8.73     G5 16 0

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