2000A&A...356L..25R

Query : 2000A&A...356L..25R

2000A&A...356L..25R - Astronomy and Astrophysics, volume 356L25-29 (2000/4-1)

Evolution of lithium in solar-type stars: clues from intermediate age clusters.

RANDICH S., PASQUINI L. and PALLAVICINI R.

Abstract (from CDS):

We present Li abundances for 14 solar-type stars in the intermediate age (∼2Gyr) clusters IC 4651 and NGC 3680. The log[n(Li)] vs. effective temperature distributions are compared with those of the similar age cluster NGC 752, of the younger Hyades (600Myr) and of the older M 67 (4.5Gyr) and NGC 188 (6-7Gyr) clusters. Neither IC 4651 nor NGC 3680 show the dispersion in Li which is observed in M 67. The 2Gyr clusters have very similar Li vs. Teff distributions; in addition, stars in the upper envelope of the M 67 distribution have the same Li content as stars in the 2Gyr clusters, suggesting that either they have not suffered any significant depletion between ∼2 and 4.5Gyr or they had a much slower Li depletion. Mechanisms that lead to Li depletion on the main sequence are discussed in the light of these observations. None of the existing models seem to reproduce well the observed features.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: open clusters and associations: individual: NGC 3680 - Galaxy: open clusters and associations: individual: IC 4651 - stars: abundances - stars: interiors

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
2 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
3 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
4 NGC 2682 119 RS* 08 51 19.0167198768 +11 50 05.755781940 13.197 13.13 12.547 12.177 11.837 F9IV 88 0
5 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
6 NGC 3680 70 * 11 25 03.4757162376 -43 17 26.302286508   15.220 14.651     ~ 28 0
7 Cl* NGC 3680 KGP 1133 * 11 25 11.6993867712 -43 06 30.957901704   14.573 14.006     ~ 16 0
8 NGC 3680 OpC 11 25 19.8 -43 14 38   8.40 7.6     ~ 340 0
9 NGC 3680 23 * 11 25 32.3255038800 -43 15 10.741547160   14.70 14.06     ~ 20 0
10 NGC 3680 60 * 11 26 20.7065904912 -43 13 07.467128544   14.99 14.36     ~ 33 0
11 Cl* IC 4651 AMC 4226 * 17 24 43.4557289976 -50 01 01.275456828           ~ 21 0
12 IC 4651 OpC 17 24 48.5 -49 55 23           ~ 374 0
13 IC 4651 211 * 17 24 52.5648835272 -50 01 03.498216168   14.93 14.28     ~ 19 0
14 IC 4651 41 * 17 25 12.8886180192 -49 57 55.391372352     14.12     ~ 7 0
15 IC 4651 43 * 17 25 14.2401503784 -49 56 43.669147992   14.89 14.193     ~ 26 0
16 Cl* IC 4651 AMC III-1108 * ~ ~           ~ 1 0
17 Cl* IC 4651 AMC III-2207 * ~ ~           ~ 1 0
18 Cl* IC 4651 AMC III-2105 * ~ ~           ~ 1 0
19 Cl* IC 4651 AMC III-1225 * ~ ~           ~ 1 0
20 Cl* IC 4651 AMC III-1109 * ~ ~           ~ 1 0

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