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


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.25CET17:21:02

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.

Abstract Copyright:

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 - 2020
#notes
1 Cl Blanco 1 OpC 00 04 07 -29 50.0           ~ 228 0
2 NGC 1039 OpC 02 42 05 +42 45.7           ~ 367 0
3 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 747 0
4 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2935 0
5 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2616 0
6 IC 2391 OpC 08 40 32 -53 02.0           ~ 709 0
7 IC 2602 OpC 10 42 58 -64 24.0           ~ 545 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 * 17 52 26.2390087165 -34 35 40.949658582   14.86 13.78     ~ 5 0
10 Cl* NGC 6475 JJ 15 * 17 52 26.5196614069 -34 35 42.314741459   15.21 14.15     ~ 4 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 40.1980787138 -34 37 30.204111859       13.55   ~ 3 0
13 GSC 07386-00359 * 17 52 46.7319821145 -34 40 58.763412718   12.62 11.93 11.90   ~ 8 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 50.1579420368 -34 37 18.421349214   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 57.7321723313 -34 56 55.766874008   12.41 11.69     ~ 6 0
19 Cl* NGC 6475 JJ 41 * 17 53 03.2438492934 -35 07 00.935235119   12.15 11.57     ~ 3 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 10.8143571535 -34 54 29.583930868   16.39 14.89     ~ 2 0
22 Cl* NGC 6475 JJ 12 * 17 53 11.9752538671 -34 40 42.073668969   12.76 12.05 12.04   ~ 7 0
23 Cl* NGC 6475 JJ 24 * 17 53 16.0348351816 -34 43 03.614572351   14.31 13.14 13.24   ~ 7 0
24 RX J175317.6-343844 * 17 53 17.6 -34 38 44           ~ 3 0
25 Cl* NGC 6475 JJ 16 * 17 53 21.2725943028 -34 54 34.955890277   13.07 12.36     ~ 7 0
26 GSC 07386-00023 SB* 17 53 21.5249377186 -34 54 17.877843028   12.88 12.19 12.11   ~ 6 0
27 Cl* NGC 6475 JJ 2 * 17 53 22.3106713262 -35 00 30.498036704   12.46 11.83     ~ 5 0
28 GSC 07386-00443 * 17 53 24.9444833376 -34 28 53.245742296   13.06 12.37     ~ 5 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           ~ 5 0
32 GSC 07386-00177 * 17 53 30.6335444938 -34 14 14.286234810     12.25 12.19   ~ 4 0
33 GSC 07386-00935 * 17 53 30.9895783921 -34 35 35.020243326   12.41 11.70     ~ 5 0
34 GSC 07386-00340 * 17 53 31.3011900443 -34 36 11.641563095   13.16 12.33     ~ 3 0
35 NGC 6475 73 * 17 53 37.2496983486 -34 47 48.603430474   12.26 11.60     ~ 10 0
36 GSC 07386-00171 ** 17 53 39.054360 -35 03 20.80800   12.60 11.88 12.11   ~ 3 0
37 GSC 07386-00462 * 17 53 40.0244656844 -34 40 04.066482050   13.56 12.78     ~ 8 0
38 Cl* NGC 6475 JJ 4 * 17 53 42.4972673326 -35 00 06.787526205   12.75 12.09 11.96   ~ 6 0
39 Cl* NGC 6475 JCB 106 * 17 53 43.2593894326 -35 27 55.558284872     12.20     ~ 3 0
40 RX J175345.0-345041 X 17 53 45.0 -34 50 41   11.34 10.79     ~ 3 0
41 GSC 07386-00355 SB* 17 53 45.3864525823 -34 46 36.314959477   11.52 10.95     ~ 8 0
42 Cl* NGC 6475 JJ 19 * 17 53 50.4295602822 -34 49 07.335680033   14.50 13.55     ~ 5 0
43 NGC 6475 OpC 17 53 51 -34 47.6           ~ 334 0
44 Cl* NGC 6475 JCB 109 * 17 53 52.8 -24 30 31     12.07     ~ 2 0
45 GSC 07386-01293 * 17 53 53.1487083016 -35 05 14.752864535   12.68 11.92     ~ 4 0
46 Cl* NGC 6475 JJ 10 * 17 53 54.2408972410 -34 46 07.863590056   13.27 12.53     K0V 7 0
47 CPD-35 7415 * 17 53 55.9063288374 -35 02 26.811045271   11.87 11.33 11.28   ~ 10 0
48 Cl* NGC 6475 JJ 9 * 17 53 57.1687455301 -34 46 02.405894711   13.59 12.79 12.69   ~ 7 0
49 GSC 07386-00986 * 17 54 07.6430334150 -34 56 39.539795899   13.12 12.43 12.35   ~ 4 0
50 GSC 07386-00275 * 17 54 09.0697548084 -34 52 17.860446884   12.83 12.20 12.07   ~ 6 0
51 Cl* NGC 6475 JJ 8 * 17 54 09.8276507421 -34 53 10.893866193   14.17 13.30     K5V 10 0
52 GSC 07386-00040 * 17 54 12.8383708800 -34 48 17.910104258   12.84 12.18 12.20   ~ 6 0
53 Cl* NGC 6475 JCB 110 * 17 54 15.0078296801 -35 25 04.631104677     12.96     ~ 3 0
54 Cl* NGC 6475 JJ 25 * 17 54 15.5437493663 -34 47 31.937552905   14.21 13.32     ~ 7 0
55 Cl* NGC 6475 JJ 23 * 17 54 19.1735261507 -34 58 22.438125621   13.08 12.37     ~ 8 0
56 GSC 07386-00332 * 17 54 20.2424371085 -34 47 43.685590060   13.19 12.37     ~ 5 0
57 GSC 07386-00672 * 17 54 22.7492794442 -34 43 58.295752990   12.86 12.20     ~ 6 0
58 GSC 07386-01799 SB* 17 54 26.1395709074 -34 42 13.041240565   13.25 12.50     ~ 6 0
59 RX J175431.6-343956 * 17 54 31.6 -34 39 56           ~ 3 0
60 Cl* NGC 6475 JJ 20 * 17 54 34.9744926455 -34 56 52.979299141   15.10 14.02 13.72   ~ 4 0
61 GSC 07386-01689 * 17 54 36.7131969985 -35 00 49.198228446   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 43.3202976889 -34 58 36.139393443     11.59     ~ 2 0
64 GSC 07386-01828 * 17 54 53.4132425997 -34 53 26.317060665   12.01 11.43     ~ 4 0
65 Cl* NGC 6475 JJ 7 * 17 54 55.5459368889 -34 38 27.631554516   12.55 11.88     ~ 6 0
66 Cl* NGC 6475 JJ 6 * 17 54 57.7041412817 -34 38 13.581917736   12.30 11.67     ~ 7 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           ~ 4 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 34.0357189771 -34 32 38.323019778   14.06 13.09 12.71   ~ 3 0
71 GSC 07386-01707 * 17 55 34.1244781321 -34 37 16.863176437   12.18 11.42     ~ 5 0
72 Cl* NGC 6475 JCB 112 * 17 55 46.9870175864 -34 42 23.888187243   14.35 13.30 13.18   ~ 6 0
73 Cl* NGC 6475 JCB 113 * 17 55 49.0377859400 -34 42 29.943856982   12.51 11.88 11.79   ~ 7 0
74 Cl* NGC 6475 JCB 115 * 17 56 16.5616239979 -34 31 16.931359875     11.70     ~ 3 0
75 [PSC95] 140B * 17 56 18.8 -34 31 59     12.38     ~ 3 0
76 Cl* NGC 6475 JCB 116 * 17 56 19.6426069709 -34 32 00.248094983     12.29     ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.02.25-17:21:02

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