2001A&A...372..862R


Query : 2001A&A...372..862R

2001A&A...372..862R - Astronomy and Astrophysics, volume 372, 862-878 (2001/6-4)

Membership, lithium, and metallicity in the young open clusters IC 2602 and IC 2391: Enlarging the sample.

RANDICH S., PALLAVICINI R., MEOLA G., STAUFFER J.R. and BALACHANDRAN S.C.

Abstract (from CDS):

We present lithium abundances for ∼50 X-ray selected candidate members of the 30-50 Myr old open clusters IC 2602 and IC 2391. These data enlarge and extend to cooler temperatures previous Li surveys of these clusters by Stauffer et al. (1989ApJ...342..285S) and Randich et al. (1997A&A...323...86R). We also give for the first time an estimate of the metallicity of the two clusters which turns out to be close to solar. Radial velocity measurements together with Hα chromospheric emission and the presence/absence of other spectroscopic features are used to ascertain the membership status for the sample stars not yet confirmed as cluster members; rotational velocities have also been determined for all sample stars. Stars more massive than ∼1M in both clusters show no sign of significant Li depletion, while lower mass stars are all lithium depleted, with the amount of Li depletion increasing to cooler temperatures. We confirm that the late-G and early-K stars in IC 2602 present a star-to-star scatter in Li abundances similar to, but not as large as the one in the Pleiades. A scatter is also seen among late-K and M dwarfs. Unlike in the Pleiades and Alpha Per clusters, the scatter among early-K stars in IC 2602 shows only marginal correlation with rotation. Our data suggest that the drop-off of lithium towards lower masses may start at an earlier color in IC 2391 than in IC 2602, but larger cluster samples are needed to confirm this result. In addition, whereas G and early K stars in the two clusters are, on average, more Li rich than their counterparts in the Pleiades, a fraction of the coolest stars, in particular in IC 2391, are as depleted as the lowest-Li Pleiades stars of the same mass. If they continue depleting Li on their way to the main sequence, they are expected to be more Li depleted than the Pleiades at the age of the latter cluster.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: IC 2602 - open clusters and associations: individual: IC 2391 - stars: abundances - stars: interiors

VizieR on-line data: <Available at CDS (J/A+A/372/862): stars.dat table2.dat table3.dat table4.dat tables.tex>

Simbad objects: 75

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Number of rows : 75
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Cl Blanco 1 OpC 00 03 25 -29 57.5           ~ 280 0
2 NGC 1039 OpC 02 42 07 +42 43.3           ~ 398 0
3 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 819 1
4 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3208 0
5 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2861 0
6 CD-52 2467 * 08 38 22.9092124584 -52 56 48.041148444   11.61 10.93 10.81   ~ 25 0
7 CD-52 2472 SB* 08 38 55.6626968784 -52 57 51.679265796 11.19 11.01 10.33 10.19   G2 35 0
8 2MASS J08385874-5319126 Y*? 08 38 58.7467263456 -53 19 12.647031996     13.77     M3 12 0
9 CD-52 2473 SB* 08 38 59.8085961096 -53 01 26.206476240 10.00 10.08 9.62     F5V 27 0
10 V* V364 Vel BY* 08 39 53.0493554064 -52 57 56.847553812   12.75 11.89 11.69   K0 35 0
11 V* V365 Vel BY* 08 40 06.2321644608 -53 38 06.875687760   11.07 10.47 10.44   G0 33 0
12 VXR PSPC 16a * 08 40 16.2484046424 -52 56 29.172145452   12.48 11.76 11.60   G9 28 0
13 Cl* IC 2391 PMM 1759 V* 08 40 18.2860194816 -53 30 28.806321024   14.73 13.51 13.07   K3e 16 0
14 HD 74340 SB* 08 41 09.9773642568 -52 54 10.540967328   10.33 9.87     F5V 40 0
15 IC 2391 OpC 08 41 10 -52 59.5           ~ 774 0
16 Cl* IC 2391 PMM 6478 * 08 41 10.9813538136 -52 31 46.692752052   11.74 11.50     ~ 16 0
17 V* V366 Vel BY* 08 41 25.8875436000 -53 22 41.467632456   13.63 12.519   11.277 K3e 31 0
18 V* V367 Vel BY* 08 41 39.6670054632 -52 59 34.032238440   14.63 12.613     K7.5e 20 0
19 Cl* IC 2391 SHJM 7 SB* 08 41 52.1694642216 -53 06 46.668430332   13.62 12.52     G7 12 1
20 V* V368 Vel BY* 08 41 57.8482531848 -52 52 13.942332264   14.59 13.76 12.74 12.03 K7e 29 0
21 CD-52 2501 * 08 42 12.2935097520 -53 06 03.797278668           F5V 30 0
22 V* V371 Vel BY* 08 42 18.5563649256 -53 01 56.872692444   15.44       M2e 28 0
23 Cl* IC 2391 PMM 4695 * 08 42 30.6875019960 -52 57 34.479920844   14.95 14.63 13.49 12.45 M1e 13 1
24 CPD-52 1614 SB* 08 42 46.6075101288 -53 01 01.341693984   10.7 10.3     ~ 31 0
25 V* V373 Vel BY* 08 43 27.7498717776 -52 57 39.097540332       14.12   ~ 20 0
26 V* V372 Vel BY* 08 43 27.8600657448 -52 57 35.900992260       13.51   ~ 18 0
27 V* V374 Vel BY* 08 43 29.2915419936 -52 41 28.328512308   12.59       K0 17 0
28 Cl* IC 2391 PMM 4778 * 08 43 46.0 -52 51 17     14.13     M0e 4 0
29 Cl* IC 2391 D 165 SB* 08 43 56.8096224120 -52 41 05.612960760   12.61 11.77     K0 16 0
30 Cl* IC 2391 PMM 2012 V* 08 43 59.0158397352 -53 33 43.654824216   12.288 11.529 11.516   K0 15 0
31 V* V376 Vel BY* 08 44 05.2223496648 -52 53 17.190402504   11.37 10.75 10.74   G3e: 36 0
32 2MASS J08441907-5308289 * 08 44 19.0950196032 -53 08 28.743931284     15.32     M3e 5 0
33 V* V377 Vel BY* 08 44 26.1593280456 -52 42 32.329984788   12.27 11.51 11.23   G9 38 0
34 V* V379 Vel BY* 08 45 26.9313010080 -52 52 02.105583096   13.79 12.76 12.54   K3e 35 0
35 V* V380 Vel Ro* 08 45 39.1343066088 -52 25 59.548764108   10.35 9.88 9.98   F8 24 0
36 CPD-53 1875 Ro* 08 45 52.7027292840 -53 27 28.292602824   10.95 10.423 10.16 9.707 G2V 18 1
37 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2191 0
38 TYC 8960-1957-1 * 10 28 31.2267933336 -63 44 15.602582148   12.06 11.31     ~ 23 0
39 V* V542 Car BY* 10 33 41.8054383552 -64 13 45.694878996   12.30 11.75     K2.5IV(e) 25 0
40 V* V544 Car BY* 10 36 18.2442889176 -64 14 56.480572608   16.68       ~ 17 0
41 V* V545 Car BY* 10 36 26.4266205408 -65 00 16.449867648   15.85       ~ 15 0
42 RX J1037.0-6458 X 10 37 01.6 -64 58 32     15.68     ~ 3 0
43 V* V547 Car BY* 10 37 22.2685053384 -64 43 19.991947836   16.67       ~ 13 0
44 V* V548 Car BY* 10 37 49.4172637704 -64 00 50.488611804   16.69       ~ 18 0
45 RX J1039.2-6440 * 10 39 14.3243806896 -64 40 49.017454392   17.25 15.72 15.82   ~ 6 0
46 RX J1039.3-6438 * 10 39 20.0102190336 -64 38 58.834122504     15.93 15.75   ~ 7 0
47 HD 310112 * 10 39 48.4494203256 -65 20 28.807185228   12.08 11.34     A3 9 0
48 V* V549 Car BY* 10 39 54.9421524216 -63 36 24.392421864   16.43       ~ 11 0
49 TYC 8961-1131-1 * 10 40 01.0177027992 -63 18 41.847220296   11.40 10.65     ~ 6 0
50 V* V551 Car BY* 10 40 30.1810788624 -64 42 16.710259644   16.31       ~ 17 0
51 V* V552 Car BY* 10 40 51.3570752544 -64 42 47.828458656   13.26       ~ 15 0
52 V* V553 Car BY* 10 41 00.0596271672 -64 20 00.682777320       15.09   ~ 10 0
53 V* V555 Car BY* 10 42 07.0839584184 -64 46 07.839386688   12.40       G 28 0
54 IC 2602 OpC 10 42 27 -64 25.6           ~ 619 0
55 V* V556 Car BY* 10 42 28.1546590608 -64 36 12.760041456   17.19       ~ 16 0
56 V* V558 Car BY* 10 44 06.8106499248 -63 59 35.059923708   11.75       G4 33 0
57 RX J1044.1-6414 * 10 44 09.9769064544 -64 14 50.737428456   16.97 15.02 14.50   ~ 9 0
58 V* V559 Car BY* 10 44 22.5515649000 -64 15 30.116510712   11.61       G0 36 0
59 V* V562 Car BY* 10 45 18.5497120560 -63 32 26.428432164   15.59       ~ 17 0
60 GES J10453719-6416088 * 10 45 37.1339242728 -64 16 08.705779860   16.60 14.98     ~ 4 0
61 V* V568 Car BY* 10 48 25.3946019792 -64 22 43.951155672   15.16       ~ 17 0
62 V* V571 Car BY* 10 49 56.8358871072 -63 48 19.080513396   14.19       ~ 17 0
63 * bet Vir PM* 11 50 41.7185158616 +01 45 53.001539131 4.26 4.15 3.60 3.13 2.85 F9V 895 0
64 HD 126053 PM* 14 23 15.2847745835 +01 14 29.641269692 6.98 6.90 6.27 5.71 5.39 G1.5V 386 0
65 V* V2213 Oph BY* 17 05 16.8186610814 +00 42 09.221511649   6.59   5.6   F8.5IV-V 329 0
66 * bet Oph PM* 17 43 28.3526482 +04 34 02.295484 5.150 3.930 2.750 1.96 1.38 K2IIICN0.5 463 0
67 IC 4665 OpC 17 46 13 +05 36.9           ~ 339 0
68 [RSP95] 28A X ~ ~     15.69     ~ 3 0
69 [RSP95] 24A * ~ ~   16.04 14.61     ~ 10 0
70 VXR PSPC 80a * ~ ~     11.98     K2 7 0
71 Cl* IC 2391 PMM 6576 * ~ ~     12.54     G6 7 0
72 [RSP95] 54A X ~ ~   13.28 12.13     ~ 3 0
73 [RSP95] 37A X ~ ~   16.55 14.69     ~ 2 0
74 [RSP95] 8A X ~ ~   11.06 10.41     ~ 4 0
75 [RSP95] 73A X ~ ~     16.02     ~ 2 0

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2022.08.16-05:54:10

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