CDS

2003A&A...407..289S

Query : 2003A&A...407..289S

2003A&A...407..289S - Astronomy and Astrophysics, volume 407, 289-301 (2003/8-3)

The evolution of lithium depletion in young open clusters: NGC 6475.

SESTITO P., RANDICH S., MERMILLIOD J.-C. and PALLAVICINI R.

Abstract (from CDS):

We have carried out a high resolution spectroscopic survey of the 220-250Myr old cluster NGC 6475: our main purpose is to investigate Li evolution during the early stages of the Main Sequence. We have determined Li abundances for 33 late F to K-type X-ray selected cluster candidates, extending the samples already available in the literature; for part of the stars we obtained radial and rotational velocities, allowing us to confirm the membership and to check for binarity. We also estimated the cluster metallicity which turned out to be over-solar ([Fe/H]=+0.14±0.06). Our Li analysis evidenced that (i) late F-type stars (Teff>6000K) undergo a very small amount of Li depletion during the early phases on the ZAMS; (ii) G-type stars (6000>Teff>5500K) instead do deplete lithium soon after arrival on the ZAMS. Whereas this result is not new, we show that the time scale for Li depletion in these stars is almost constant between 100 and 600Myr; (iii) we confirm that the spread observed in early K-type stars in younger clusters has converged by 220Myr. No constraints can be put on later-type stars. (iv) Finally, we investigate the effect of metallicity on Li depletion by comparing NGC 6475 with the similar age cluster M 34, but we show that the issue remains open, given the uncertain metallicity of the latter cluster. By using the combined NGC 6475+M 34 sample together with the Hyades and the Pleiades, we compare quantitatively Li evolution from the ZAMS to 600Myr with theoretical predictions of standard models.

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Journal keyword(s): stars: abundances - stars: evolution - open clusters and associations: individual: NGC 6475

Simbad objects: 76

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Number of rows : 76
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023 		#notes
1 Cl Blanco 1 OpC 00 03 25 -29 57.5           ~ 296 0
2 NGC 1039 OpC 02 42 07 +42 43.3           ~ 408 0
3 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 827 0
4 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3294 0
5 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2941 0
6 IC 2391 OpC 08 41 10 -52 59.5           ~ 798 0
7 IC 2602 OpC 10 42 27 -64 25.6           ~ 643 0
8 Cl* NGC 6475 JJ 40 * 17 51 35.8 -34 45 15   14.43 13.30     ~ 5 0
9 Cl* NGC 6475 JJ 14 Y*? 17 52 26.2377276696 -34 35 40.955940744   14.86 13.78     ~ 6 0
10 Cl* NGC 6475 JJ 15 * 17 52 26.5199498616 -34 35 42.312640884   15.21 14.15     ~ 7 0
11 UCAC4 276-135114 ** 17 52 32.374536 -34 55 50.51028   14.04 12.90 12.65   ~ 2 0
12 Cl* NGC 6475 JJ 18 * 17 52 40.1981371608 -34 37 30.203409576       13.55   ~ 3 0
13 GSC 07386-00359 * 17 52 46.7321399664 -34 40 58.764746208   12.62 11.93 11.90   ~ 9 0
14 Cl* NGC 6475 JCB 103 * 17 52 49.8 -34 57 56     12.55     ~ 2 0
15 Cl* NGC 6475 JCB 104 * 17 52 50.1585831792 -34 37 18.421549464   13.02 12.30 12.18   ~ 5 0
16 GSC 07386-00151 ** 17 52 51.1 -34 52 14   12.99 12.28     ~ 2 0
17 Cl* NGC 6475 JCB 105 * 17 52 55.7 -34 38 43     12.92     ~ 2 0
18 Cl* NGC 6475 JJ 13 * 17 52 57.7310541888 -34 56 55.761315036   12.41 11.69     ~ 7 0
19 Cl* NGC 6475 JJ 41 * 17 53 03.2440491288 -35 07 00.933922812   12.15 11.57     ~ 5 0
20 Cl* NGC 6475 JJ 22 * 17 53 08.5 -34 45 57   11.61 11.11     F5-G0V 7 0
21 [PSC95] 26A * 17 53 10.8145179624 -34 54 29.585624040   16.39 14.89     ~ 2 0
22 Cl* NGC 6475 JJ 12 * 17 53 11.9752371600 -34 40 42.072572136   12.76 12.05 12.04   ~ 9 0
23 Cl* NGC 6475 JJ 24 * 17 53 16.0348959408 -34 43 03.615204108   14.31 13.14 13.24   ~ 8 0
24 RX J175317.6-343844 * 17 53 17.6 -34 38 44           ~ 3 0
25 Cl* NGC 6475 JJ 16 * 17 53 21.2727515160 -34 54 34.954344036   13.07 12.36     ~ 10 0
26 Cl* NGC 6475 JJ 31 SB* 17 53 21.5249065608 -34 54 17.876260584   12.88 12.19 12.11   ~ 10 0
27 Cl* NGC 6475 JJ 2 * 17 53 22.3103848368 -35 00 30.503605680   12.46 11.83     ~ 6 0
28 GSC 07386-00443 * 17 53 24.9446659176 -34 28 53.245026732   13.06 12.37     ~ 7 0
29 [PSC95] 48A * 17 53 27.6 -34 55 27   16.01 14.73     ~ 2 0
30 Cl* NGC 6475 JJ 11 * 17 53 29.3 -34 48 17   14.30 13.40     ~ 4 0
31 RX J175329.5-344820 X 17 53 29.5 -34 48 20           ~ 6 0
32 GSC 07386-00177 SB* 17 53 30.6308461512 -34 14 14.307471024     12.25 12.19   ~ 4 0
33 GSC 07386-00935 * 17 53 30.9897696696 -34 35 35.019415572   12.41 11.70     ~ 6 0
34 GSC 07386-00340 * 17 53 31.2978858408 -34 36 11.805204240   13.16 12.33     ~ 3 0
35 NGC 6475 73 * 17 53 37.2474305472 -34 47 48.497314776   12.26 11.60     ~ 11 0
36 GSC 07386-00171 ** 17 53 39.054360 -35 03 20.80800   12.60 11.88 12.11   ~ 3 0
37 Cl* NGC 6475 JJ 35 * 17 53 40.0264494768 -34 40 04.046444652   13.56 12.78     ~ 9 0
38 Cl* NGC 6475 JJ 4 * 17 53 42.4974431664 -35 00 06.785381592   12.75 12.09 11.96   ~ 6 0
39 Cl* NGC 6475 JCB 106 * 17 53 43.2596054952 -35 27 55.558799748     12.20     ~ 6 0
40 RX J175345.0-345041 X 17 53 45.0 -34 50 41   11.34 10.79     ~ 3 0
41 Cl* NGC 6475 JJ 5 SB* 17 53 45.3855548592 -34 46 36.329900376   11.52 10.95     ~ 8 0
42 NGC 6475 OpC 17 53 47 -34 50.5           ~ 366 0
43 Cl* NGC 6475 JJ 19 * 17 53 50.4296110848 -34 49 07.334841540   14.50 13.55     ~ 7 0
44 Cl* NGC 6475 JCB 109 * 17 53 52.8 -24 30 31     12.07     ~ 2 0
45 GSC 07386-01293 * 17 53 53.1490441512 -35 05 14.757692712   12.68 11.92     ~ 6 0
46 Cl* NGC 6475 JJ 10 * 17 53 54.2409232776 -34 46 07.862531448   13.27 12.53     K0V 9 0
47 CPD-35 7415 * 17 53 55.9063851264 -35 02 26.808980208   11.87 11.33 11.28   ~ 11 0
48 Cl* NGC 6475 JJ 9 * 17 53 57.1689061560 -34 46 02.407921392   13.59 12.79 12.69   ~ 8 0
49 GSC 07386-00986 * 17 54 07.6430931096 -34 56 39.539065164   13.12 12.43 12.35   ~ 4 0
50 GSC 07386-00275 * 17 54 09.0702721224 -34 52 17.881677300   12.83 12.20 12.07   ~ 6 0
51 Cl* NGC 6475 JJ 8 * 17 54 09.8275318704 -34 53 10.892952024   14.17 13.30     K5V 12 0
52 GSC 07386-00040 * 17 54 12.8384548416 -34 48 17.908668720   12.84 12.18 12.20   ~ 6 0
53 Cl* NGC 6475 JCB 110 * 17 54 15.0077948928 -35 25 04.633289112     12.96     ~ 6 0
54 Cl* NGC 6475 JJ 25 * 17 54 15.5439711144 -34 47 31.944173208   14.21 13.32     ~ 8 0
55 Cl* NGC 6475 JJ 23 * 17 54 19.1736687864 -34 58 22.437852240   13.08 12.37     ~ 12 0
56 Cl* NGC 6475 JJ 27 * 17 54 20.2443453336 -34 47 43.707076260   13.19 12.37     ~ 6 0
57 GSC 07386-00672 * 17 54 22.7492600904 -34 43 58.294031124   12.86 12.20     ~ 9 0
58 Cl* NGC 6475 JJ 34 SB* 17 54 26.1401434128 -34 42 13.041337896   13.25 12.50     ~ 8 0
59 RX J175431.6-343956 * 17 54 31.6 -34 39 56           ~ 3 0
60 Cl* NGC 6475 JJ 20 * 17 54 34.9744703232 -34 56 52.978290612   15.10 14.02 13.72   ~ 4 0
61 Cl* NGC 6475 JJ 33 * 17 54 36.7146819888 -35 00 49.196441124   13.73 12.92     ~ 5 0
62 RX J175441.3-345044 * 17 54 41.3 -34 50 44           ~ 4 0
63 Cl* NGC 6475 JCB 111 * 17 54 43.3203938856 -34 58 36.137278812     11.59     ~ 2 0
64 GSC 07386-01828 * 17 54 53.4134282088 -34 53 26.313138096   12.01 11.43     ~ 4 0
65 Cl* NGC 6475 JJ 7 * 17 54 55.5463586928 -34 38 27.602253816   12.55 11.88     ~ 7 0
66 Cl* NGC 6475 JJ 6 * 17 54 57.7041897504 -34 38 13.580255220   12.30 11.67     ~ 11 0
67 RX J175503.8-345718 X 17 55 03.9 -34 57 18   12.49 11.81     ~ 4 0
68 RX J175514.8-345140 * 17 55 14.9 -34 51 40           ~ 5 0
69 RX J175527.8-352602 X 17 55 27.8 -35 26 02   13.25 12.41     ~ 3 0
70 UCAC4 278-148144 * 17 55 34.0358753016 -34 32 38.322281004   14.06 13.09 12.71   ~ 5 0
71 GSC 07386-01707 * 17 55 34.1248845624 -34 37 16.882456440   12.18 11.42     ~ 7 0
72 Cl* NGC 6475 JCB 112 * 17 55 46.9868353992 -34 42 23.892745176   14.35 13.30 13.18   ~ 6 0
73 Cl* NGC 6475 JCB 113 * 17 55 49.0377778992 -34 42 29.940464592   12.51 11.88 11.79   ~ 9 0
74 Cl* NGC 6475 JCB 115 * 17 56 16.5618002880 -34 31 16.931246808     11.70     ~ 5 0
75 [PSC95] 140B * 17 56 18.8 -34 31 59     12.38     ~ 3 0
76 Cl* NGC 6475 JCB 116 * 17 56 19.6420582872 -34 32 00.250290708     12.29     ~ 3 0

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2023.03.30-07:28:45

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