2008A&A...479..141M

Query : 2008A&A...479..141M

2008A&A...479..141M - Astronomy and Astrophysics, volume 479, 141-148 (2008/2-3)

Detection of the lithium depletion boundary in the young open cluster IC 4665.

MANZI S., RANDICH S., DE WIT W.J. and PALLA F.

Abstract (from CDS):

The so-called lithium depletion boundary (LDB) provides a secure and independent tool for deriving the ages of young open clusters. In this context, our goal is to determine membership for a sample of 147 photometrically selected candidates of the young open cluster IC4665 and to use confirmed members to establish an age based on the LDB. Employing the FLAMES multi-object spectrograph on VLT/UT2, we have obtained intermediate-resolution spectra of the cluster candidates. The spectra were used to measure radial velocities and to infer the presence of the LiI 670.8nm doublet and Hα emission. We have identified 39 bona fide cluster members based on radial velocity, Hα emission, and Li absorption. The mean radial velocity of IC4665 is found to be Vrad=-15.95±1.13km/s. Confirmed cluster members display a sharp transition in magnitude between stars with and without lithium, both in the Im vs. Im-z and in the Ks vs. IC-Ks diagrams. From this boundary, we deduce a cluster age of 27.7+4.2–3.5±1.1±2Myr. IC4665 is the fifth cluster for which an LDB age has been determined, and it is the youngest cluster among these five. Thus, the LDB is established from relatively bright stars still in the contracting pre-main sequence phase. The mass of the boundary is M*=0.24±0.04M☉. The LDB age agrees well with the ages derived from isochrone fitting of both low and high mass, turn-off stars, a result similar to what is found in the slightly older NGC 2547.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: IC4665 - stars: low-mass, brown dwarfs - stars: pre-main-sequence - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/479/141): table1.dat table2.dat>

Nomenclature: Table 1: Cl* IC 4665 MRD NNN (Nos 1-147).

CDS comments: Paragraph. 3.3. IC 4465 is a probable misprint for IC 4665.

Simbad objects: 157

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Number of rows : 157
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 Cl Melotte 20 OpC 03 26 28.1 +48 58 30           ~ 861 0
2 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3434 0
3 NGC 2169 OpC 06 08 30 +13 57.1   5.99 5.9     ~ 160 0
4 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 400 0
5 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 822 0
6 NAME eta Cha Association OpC 08 42 32.9 -78 57 47           ~ 363 0
7 NAME TW Hya Association As* 11 01.9 -34 42           ~ 942 0
8 NAME Cha-near Moving Group As* 12 00 -79.0           ~ 11 0
9 Cl* IC 4665 MRD 1 * 17 44 45.0064226928 +06 02 11.553089244         14.691 ~ 7 0
10 Cl* IC 4665 MRD 2 * 17 44 47.6642210064 +06 01 52.885104060   13.19 11.52     ~ 5 0
11 Cl* IC 4665 MRD 3 * 17 44 48.1202159232 +06 02 01.331015172         15.350 ~ 3 0
12 Cl* IC 4665 MRD 4 * 17 44 48.3615217344 +05 55 13.510943724         17.461 ~ 4 0
13 Cl* IC 4665 MRD 5 * 17 44 51.4354026072 +05 49 53.378095656     18.40     ~ 3 0
14 2MASS J17445249+0548354 Y*O 17 44 52.4927355840 +05 48 35.438847336   15.40 14.118   12.614 ~ 10 0
15 Cl* IC 4665 MRD 7 * 17 44 55.1123725296 +05 49 40.410260544     17.86   15.763 ~ 3 0
16 Cl* IC 4665 MRD 8 * 17 44 57.2650580112 +05 47 19.975811640     20.11   16.305 ~ 6 0
17 2MASS J17445810+0551329 Y*O 17 44 58.1022677952 +05 51 32.868902340   14.31 13.426   12.623 G7 35 0
18 Cl* IC 4665 MRD 10 * 17 45 01.5595491361 +05 56 22.349514458     17.26   15.529 ~ 7 0
19 Cl* IC 4665 P 204 * 17 45 01.92 +05 51 55.6     19.17   16.537 ~ 3 0
20 Cl* IC 4665 MRD 12 * 17 45 02.3863119768 +06 07 32.463465888         12.841 ~ 1 0
21 Cl* IC 4665 P 206 * 17 45 03.6512619816 +05 54 32.984488980   16.93 15.324   13.674 ~ 4 0
22 Cl* IC 4665 MRD 14 * 17 45 07.4624328816 +05 50 59.355935232   15.27 14.305   13.035 ~ 16 0
23 Cl* IC 4665 MRD 15 * 17 45 10.0737132144 +05 49 21.411146676   16.77 15.49   14.124 ~ 8 0
24 2MASS J17451048+0546173 Y*O 17 45 10.4827561224 +05 46 17.322751056   15.81 14.674   13.413 ~ 9 0
25 Cl* IC 4665 MRD 17 * 17 45 10.8637169328 +05 47 57.306903612     18.86   16.074 ~ 3 0
26 Cl* IC 4665 P 217 * 17 45 10.9049110704 +05 56 06.829371600     18.39   15.745 ~ 5 0
27 Cl* IC 4665 MRD 19 * 17 45 11.7143241048 +05 45 25.325017416     20.33   17.183 ~ 3 0
28 2MASS J17451293+0549505 Y*? 17 45 12.9395804136 +05 49 50.518577856   14.99 13.742   12.440 ~ 9 0
29 Cl* IC 4665 MRD 21 * 17 45 13.3031440200 +05 55 34.951238760   16.04 14.799   13.651 ~ 4 0
30 Cl* IC 4665 MRD 22 * 17 45 14.9698357344 +05 49 42.219604236   16.26 15.12   13.912 ~ 8 0
31 Cl* IC 4665 MRD 23 * 17 45 15.1881509808 +06 07 44.823033984         16.975 ~ 3 0
32 Cl* IC 4665 MRD 24 * 17 45 16.6986695496 +05 53 56.401963764     17.765   15.459 ~ 11 0
33 Cl* IC 4665 MRD 25 * 17 45 18.4522036680 +05 44 58.797542328         17.266 ~ 5 0
34 V* V2316 Oph BY* 17 45 19.3988522256 +05 47 40.119087444   14.60 13.716   12.696 G6 37 0
35 2MASS J17451997+0546295 Y*O 17 45 19.9841897856 +05 46 29.513382276   17.53 15.993   14.147 ~ 18 0
36 2MASS J17452048+0553207 Y*O 17 45 20.4853525032 +05 53 20.648967504     19.77   16.074 ~ 10 0
37 Cl* IC 4665 MRD 29 * 17 45 20.8669251048 +05 54 27.666624348     14.027   12.761 ~ 8 0
38 Cl* IC 4665 MRD 30 * 17 45 22.0383523992 +05 58 25.714358148     14.279   12.823 ~ 8 0
39 2MASS J17452317+0557065 Y*? 17 45 23.1802572576 +05 57 06.557386536     21.64   16.928 ~ 6 0
40 Cl* IC 4665 MRD 32 * 17 45 24.8489759208 +06 00 07.967896344         16.486 ~ 3 0
41 V* V2318 Oph BY* 17 45 25.0724676027 +05 51 38.870504059   14.39 13.716   12.697 G5 38 0
42 Cl* IC 4665 MRD 34 * 17 45 29.0750776584 +05 45 09.315319104         17.716 ~ 4 0
43 Cl* IC 4665 MRD 35 * 17 45 30.0463710960 +05 48 49.099972464     17.625   15.123 ~ 10 0
44 Cl* IC 4665 MRD 36 * 17 45 30.1342120200 +05 47 07.492697340     17.87   14.913 ~ 5 0
45 Cl* IC 4665 MRD 37 * 17 45 30.4586392728 +05 58 22.261062792     14.205   12.883 ~ 8 0
46 Cl* IC 4665 MRD 38 * 17 45 33.0886044552 +05 46 24.417810876         12.488 ~ 1 0
47 Cl* IC 4665 MRD 39 * 17 45 35.9004604152 +05 49 04.345044348   16.19 14.914   13.513 ~ 9 0
48 Cl* IC 4665 MRD 40 * 17 45 37.6540479000 +05 53 53.457357804     14.460   12.830 ~ 7 0
49 Cl* IC 4665 MRD 41 * 17 45 37.8308896992 +05 45 33.455223540     17.20   15.201 ~ 7 0
50 Cl* IC 4665 MRD 42 * 17 45 38.3035447224 +05 44 44.316700800     18.68   16.226 ~ 3 0
51 Cl* IC 4665 MRD 43 * 17 45 39.9669594672 +05 45 16.376057532     18.82     ~ 3 0
52 Cl* IC 4665 P 260 * 17 45 41.0251067575 +05 54 23.442218822     17.78   15.378 ~ 8 0
53 Cl* IC 4665 MRD 45 * 17 45 42.4171499616 +05 55 41.131894944     14.357   13.177 ~ 8 0
54 Cl* IC 4665 MRD 46 * 17 45 43.52 +05 55 56.5     20.07   17.152 ~ 3 0
55 LB 3885 * 17 45 44.9743463928 +05 49 51.357484848   17.7     17.059 ~ 2 0
56 Cl* IC 4665 MRD 48 * 17 45 56.0045661624 +05 52 45.222929868     19.73   16.570 ~ 4 0
57 IC 4665 57 * 17 45 56.4854309881 +05 48 44.693732372   11.4 11.2     A 27 0
58 Cl* IC 4665 MRD 50 * 17 45 56.7250631101 +05 52 24.010314692     16.57   14.505 ~ 9 0
59 Cl* IC 4665 P 276 * 17 45 59.5309412400 +05 50 45.517714620   16.13 14.978   13.654 ~ 4 0
60 Cl* IC 4665 P 277 * 17 45 59.9115480192 +05 36 18.094482036     18.81   16.098 ~ 4 0
61 Cl* IC 4665 P 278 * 17 46 01.5621627072 +05 37 11.596462536     17.45   15.458 ~ 3 0
62 Cl* IC 4665 MRD 54 * 17 46 01.60 +05 36 52.8     17.20   15.155 ~ 3 0
63 Cl* IC 4665 P 283 Y*? 17 46 03.2560604688 +05 33 12.583637928     18.25   15.474 ~ 9 0
64 Cl* IC 4665 MRD 56 * 17 46 03.3846688248 +05 50 57.526491804     19.47   16.435 ~ 4 0
65 Cl* IC 4665 MRD 57 * 17 46 03.4913594352 +05 49 42.604489020     18.65   15.798 ~ 9 0
66 Cl* IC 4665 MRD 58 * 17 46 05.7598026336 +05 41 54.645283752     17.952   15.425 ~ 11 0
67 2MASS J17460971+0540581 Y*? 17 46 09.7140849408 +05 40 58.168035732   16.29 14.916   13.443 ~ 4 0
68 2MASS J17461030+0530563 Y*O 17 46 10.3129220880 +05 30 56.309891040         16.940 ~ 5 0
69 Cl* IC 4665 P 292 * 17 46 10.811 +05 42 21.47     18.04     ~ 3 0
70 V* V2321 Oph BY* 17 46 11.9798853179 +05 41 25.876171084   15.43 14.407   13.074 K0 35 0
71 Cl* IC 4665 MRD 63 * 17 46 12.6395637336 +05 38 54.756003876   16.72 15.431   13.940 ~ 9 0
72 IC 4665 OpC 17 46 13.0 +05 36 54           ~ 372 0
73 Cl* IC 4665 MRD 64 * 17 46 13.8194930472 +05 30 21.484530792     19.06   16.203 ~ 5 0
74 Cl* IC 4665 P 300 * 17 46 14.05 +05 36 17.1     20.39   16.916 ~ 4 0
75 Cl* IC 4665 MRD 66 * 17 46 15.183 +05 29 25.29   16.01 14.50   12.761 ~ 3 0
76 Cl* IC 4665 P 303 PM* 17 46 15.2354712312 +05 33 51.896403324     18.09   15.542 ~ 4 0
77 Cl* IC 4665 MRD 68 * 17 46 17.7862655736 +05 45 08.999665884   15.81 14.708   13.344 ~ 10 0
78 2MASS J17461900+0546203 Y*O 17 46 18.9987185040 +05 46 20.433832140   18.42 16.910   14.745 M1 12 0
79 Cl* IC 4665 MRD 70 PM* 17 46 20.0648200440 +05 45 00.251206740     18.92   16.226 ~ 3 0
80 2MASS J17462126+0529148 Y*? 17 46 21.2719700064 +05 29 14.752418964     19.97   16.736 ~ 7 0
81 2MASS J17462331+0537178 Y*? 17 46 23.3070587784 +05 37 17.813047260     17.85   14.876 ~ 12 0
82 Cl* IC 4665 MRD 73 * 17 46 23.892 +05 47 26.94   17.74 16.08   14.151 ~ 3 0
83 2MASS J17462477+0535381 Y*O 17 46 24.7716311156 +05 35 38.122474357   14.53 13.940   12.718 G8 23 0
84 Cl* IC 4665 P 320 * 17 46 27.2237304960 +05 29 28.386329460     18.63   16.096 ~ 5 0
85 Cl* IC 4665 MRD 76 * 17 46 28.4044976112 +05 40 18.024577968   16.60 15.304   13.858 ~ 10 0
86 Cl* IC 4665 P 323 * 17 46 28.9132885296 +05 33 45.051899760     17.87   15.650 ~ 3 0
87 Cl* IC 4665 MRD 78 * 17 46 29.1268935288 +05 31 19.883323416   15.97 14.772   13.421 ~ 9 0
88 Cl* IC 4665 MRD 79 * 17 46 29.4805141656 +05 28 45.670697148   16.09 14.921   13.672 ~ 10 0
89 Cl* IC 4665 MRD 80 * 17 46 30.2533133736 +05 30 32.034382236   17.68 15.89   14.353 ~ 8 0
90 Cl* IC 4665 MRD 81 * 17 46 30.4718504208 +05 29 13.957158840     17.63   15.589 ~ 3 0
91 2MASS J17463173+0528350 Y*O 17 46 31.7368886376 +05 28 34.931209692     18.87   15.940 ~ 4 0
92 2MASS J17463397+0540540 Y*O 17 46 33.9687040536 +05 40 54.087904956   16.32 15.163   13.705 ~ 9 0
93 Cl* IC 4665 MRD 84 * 17 46 34.5046913760 +05 48 53.120663748   15.63 14.488   13.231 ~ 10 0
94 2MASS J17463473+0533335 Y*O 17 46 34.7276780616 +05 33 33.611792724     20.50   16.706 ~ 6 0
95 Cl* IC 4665 MRD 86 * 17 46 35.1536402400 +05 26 28.825211652     17.93     ~ 7 0
96 2MASS J17463530+0536106 Y*? 17 46 35.2926913200 +05 36 10.623948804     19.07   15.902 ~ 11 0
97 2MASS J17463553+0531075 Y*O 17 46 35.5309490160 +05 31 07.481777268     17.530   14.910 ~ 20 0
98 Cl* IC 4665 P 337 * 17 46 37.7080015608 +05 40 06.435010416     19.47   16.568 ~ 4 0
99 2MASS J17463838+0535486 Y*O 17 46 38.3740150944 +05 35 48.685587036     19.85   16.685 ~ 7 0
100 Cl* IC 4665 MRD 91 * 17 46 40.6443000000 +05 28 54.142961016   16.37 15.176   13.822 ~ 9 0
101 Cl* IC 4665 MRD 92 * 17 46 40.6545478416 +05 40 19.957862568     19.86   16.819 ~ 4 0
102 Cl* IC 4665 MRD 93 Y*? 17 46 40.811 +05 28 21.36         16.840 ~ 1 0
103 2MASS J17464090+0549026 Y*O 17 46 40.9103331816 +05 49 02.708075316     20.68   16.650 ~ 7 0
104 Cl* IC 4665 P 343 Y*O 17 46 40.9920682248 +05 44 18.395411676     17.851   15.228 ~ 11 0
105 Cl* IC 4665 MRD 96 * 17 46 42.2137391808 +05 33 41.961672396   16.74 15.482   13.988 ~ 9 0
106 Cl* IC 4665 MRD 97 * 17 46 43.321704 +05 35 14.14320     16.671 16.112 14.768 ~ 10 0
107 2MASS J17464376+0530076 Y*O 17 46 43.7694816576 +05 30 07.675471764     18.75   15.716 ~ 11 0
108 Cl* IC 4665 MRD 99 * 17 46 45.1472669976 +05 26 58.268344200   15.76 14.638   13.306 ~ 15 0
109 2MASS J17464536+0545060 Y*O 17 46 45.3636737616 +05 45 06.155953920     20.28   16.475 ~ 7 0
110 LB 3900 * 17 46 46.34 +05 37 09.6   18.5     17.270 ~ 2 0
111 Cl* IC 4665 MRD 102 * 17 46 46.5750352008 +05 35 06.839992140   15.70 14.589   13.325 ~ 15 0
112 Cl* IC 4665 MRD 103 * 17 46 46.7368896984 +05 49 09.429914316   15.47 14.190   12.807 ~ 4 0
113 Cl* IC 4665 MRD 104 * 17 46 46.8329015160 +05 47 05.212629744   16.01 14.619   13.251 ~ 4 0
114 2MASS J17464762+0531380 Y*O 17 46 47.6274446568 +05 31 37.989543900     18.09   15.237 ~ 11 0
115 Cl* IC 4665 MRD 106 * 17 46 48.1109435400 +05 47 58.755830136   16.24 14.849   13.415 ~ 4 0
116 Cl* IC 4665 MRD 107 * 17 46 48.7404441864 +05 43 00.702921720   16.32 15.157   13.803 ~ 9 0
117 Cl* IC 4665 MRD 108 * 17 46 48.8185548960 +05 41 59.046656352     19.41   16.276 ~ 5 0
118 Cl* IC 4665 MRD 109 * 17 46 48.9665589528 +05 48 55.041882048     18.60   15.853 ~ 4 0
119 Cl* IC 4665 P 362 * 17 46 50.23 +05 36 41.1     17.50   15.785 ~ 3 0
120 Cl* IC 4665 P 364 * 17 46 51.85 +05 31 27.7     18.31   16.027 ~ 3 0
121 Cl* IC 4665 P 123 * 17 46 52.1990813544 +05 32 36.985298352   16.76 15.412   14.059 ~ 8 0
122 Cl* IC 4665 MRD 113 * 17 46 53.0207187984 +05 32 47.004988236   16.91 15.578   14.083 ~ 9 0
123 Cl* IC 4665 P 367 * 17 46 54.0873159648 +05 31 26.322033432     21.65   17.898 ~ 3 0
124 Cl* IC 4665 MRD 115 * 17 46 54.7197925656 +05 41 59.876225736         17.854 ~ 3 0
125 Cl* IC 4665 MRD 116 * 17 46 54.9918204696 +05 37 45.214983300   16.45 15.022   13.465 ~ 9 0
126 Cl* IC 4665 MRD 117 * 17 46 55.1635278360 +05 41 12.794889732     20.16   16.322 ~ 5 0
127 Cl* IC 4665 MRD 118 * 17 46 55.6246450104 +05 30 29.525761836     18.02   15.390 ~ 10 0
128 2MASS J17465601+0538349 Y*O 17 46 56.0116476216 +05 38 35.043204876     20.38   16.608 ~ 8 0
129 2MASS J17465642+0547446 Y*O 17 46 56.4164128992 +05 47 44.642504472     16.716   14.554 ~ 18 0
130 2MASS J17465664+0536073 Y*O 17 46 56.6413277352 +05 36 07.210814976     19.77   16.169 ~ 6 0
131 Cl* IC 4665 MRD 122 * 17 46 58.6915339752 +05 47 26.053024128   15.84 14.642   13.377 ~ 3 0
132 Cl* IC 4665 MRD 123 PM* 17 46 59.0312963952 +05 45 44.856775404     17.828   14.966 ~ 10 0
133 Cl* IC 4665 MRD 124 * 17 46 59.3202810048 +05 30 10.340082864   15.49 14.066   12.509 ~ 3 0
134 2MASS J17470022+0530290 Y*O 17 47 00.2353142424 +05 30 29.060178372   16.32 14.976   13.680 ~ 9 0
135 Cl* IC 4665 MRD 126 * 17 47 01.7803291608 +05 45 23.003005752     19.01   16.281 ~ 3 0
136 Cl* IC 4665 P 378 * 17 47 01.9178200992 +05 30 45.419483448     20.42   17.119 ~ 4 0
137 2MASS J17470309+0534463 Y*O 17 47 03.1040272440 +05 34 46.352997264     19.45   16.116 ~ 10 0
138 Cl* IC 4665 MRD 129 * 17 47 05.2872403248 +05 43 31.378368144   15.42 14.185   12.882 ~ 9 0
139 Cl* IC 4665 MRD 130 * 17 47 06.4817204016 +05 28 04.062689688   16.82 15.439   13.829 ~ 8 0
140 Cl* IC 4665 P 383 * 17 47 07.6008583560 +05 36 14.744500056   17.12 15.75   14.467 ~ 2 0
141 Cl* IC 4665 MRD 132 * 17 47 08.5228739880 +05 37 37.654057668     14.373   13.025 ~ 7 0
142 Cl* IC 4665 P 385 * 17 47 09.9155853864 +05 28 13.368698940     18.77   17.043 ~ 2 0
143 Cl* IC 4665 MRD 134 * 17 47 09.9662705448 +05 43 14.071402020     18.53   15.667 ~ 9 0
144 Cl* IC 4665 MRD 135 * 17 47 09.9785687424 +05 29 06.406652544     16.935   14.712 ~ 9 0
145 Cl* IC 4665 MRD 136 * 17 47 11.0371944864 +05 39 55.974301164   16.01 14.834   13.596 ~ 9 0
146 Cl* IC 4665 P 392 * 17 47 11.6694556344 +05 33 09.929416896     21.09   17.250 ~ 5 0
147 2MASS J17471186+0529247 Y*? 17 47 11.8806803856 +05 29 24.758989548     19.62   16.236 ~ 7 0
148 Cl* IC 4665 MRD 139 * 17 47 11.9958745680 +05 43 00.026453568           ~ 1 0
149 Cl* IC 4665 MRD 140 * 17 47 12.4868492712 +05 36 33.827022468   16.28 14.729   13.058 ~ 3 0
150 Cl* IC 4665 MRD 141 PM* 17 47 12.5353559016 +05 42 14.931430344     17.328   14.552 ~ 9 0
151 2MASS J17471628+0529495 Y*O 17 47 16.282 +05 29 49.50   16.97 15.411   13.844 ~ 9 0
152 Cl* IC 4665 MRD 143 * 17 47 17.2045378824 +05 31 24.031943868         12.509 ~ 6 0
153 2MASS J17471948+0544473 Y*O 17 47 19.4936480544 +05 44 47.403481488         17.248 ~ 5 0
154 2MASS J17471949+0530413 Y*O 17 47 19.5111754080 +05 30 41.346266148     18.54   15.373 ~ 9 0
155 Cl* IC 4665 MRD 146 * 17 47 19.6451813544 +05 43 40.778903820     19.66   16.290 ~ 8 0
156 2MASS J17472001+0546537 Y*O 17 47 20.0158098096 +05 46 53.717550276     17.893   15.271 ~ 19 0
157 NGC 7160 OpC 21 53 48 +62 35.3   6.34 6.1     ~ 235 0

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