CDS

2004A&A...418..539H

Query : 2004A&A...418..539H

2004A&A...418..539H - Astronomy and Astrophysics, volume 418, 539-549 (2004/5-1)

Membership, rotation, and lithium abundances in the open clusters NGC 2451 A and B.

HUENSCH M., RANDICH S., HEMPEL M., WEIDNER C. and SCHMITT J.H.M.M.

Abstract (from CDS):

High-resolution spectra of 30 late-type and 9 early-type candidate members of the young (∼50-80Myr) open clusters NGC 2451 A and B have been analyzed in order to complement our previous photometric and X-ray study. Cluster membership of these X-ray selected stars has been confirmed or rejected on the basis of radial velocity and Hα chromospheric emission. The metallicity of both clusters seems to be about solar - contrary to previous investigations. Lithium abundances have been determined by two different methods, namely curve-of-growth techniques and spectrum synthesis, yielding quite consistent results. The pattern of Li abundances versus effective temperature resembles that of the equally-old Alpha Per cluster, i.e., little Li depletion is seen for solar-type and earlier-type stars, while towards cooler stars Li is more and more depleted, possibly showing a star-to-star scatter below ∼ 5200K. The hottest star in our sample shows a Li abundance ∼0.5dex higher than the meteoritic value. Rotational velocities have been determined in order to investigate the supposed dependence of activity and Li depletion on rotation.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: late-type - stars: rotation - Galaxy: open clusters and associations: individual: NGC 2451

Simbad objects: 48

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Number of rows : 48
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 V* V984 Tau BY* 04 16 33.4775734800 +21 54 26.882025156   9.944 9.125     ~ 171 0
2 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3018 0
3 HD 28545 SB* 04 30 34.8766762656 +15 44 02.372601156   9.720 8.84 9.03   K0 83 1
4 * bet Lep PM* 05 28 14.7228880318 -20 45 33.997988694 4.13 3.66 2.84 2.19 1.75 G5II-IIIa: 239 0
5 CD-37 3808 SB* 07 42 43.5631196040 -38 02 57.853243716   10.58 10.30     ~ 18 0
6 CD-37 3810 SB* 07 42 52.6278820440 -38 03 26.939706696   11.40 10.84     ~ 9 0
7 NGC 2451A OpC 07 42 56.6 -38 15 50           ~ 123 0
8 2MASS J07430635-3809210 * 07 43 06.3504465096 -38 09 21.027337740 17.636 16.611 15.152 14.158 13.017 ~ 13 0
9 HD 62712 * 07 43 42.9160399680 -38 12 06.767386272 5.76 6.24 6.40     B8IV 83 0
10 CD-37 3823 * 07 43 49.3114344200 -37 53 44.407068114   11.049 10.627 10.198 9.890 ~ 15 0
11 Cl* NGC 2451 PKB 2275 * 07 43 54.3421982304 -38 00 02.736243468 13.632 13.150 12.309   11.373 ~ 18 0
12 Cl* NGC 2451 PKB 6499 * 07 43 57.4904969784 -38 27 51.021105120   14.697 13.537     ~ 15 0
13 Cl* NGC 2451 AR 43 * 07 44 09.9169993368 -37 54 52.758286164   14.189 13.396 12.930 12.471 ~ 11 0
14 [HWS2003] X30 X 07 44 16 -37 46.0   14.21 13.15     ~ 2 0
15 Cl* NGC 2451 PKB 1256 * 07 44 24.0633148008 -38 35 59.041061736   11.562 10.953     ~ 13 0
16 HD 62876 * 07 44 28.0958555856 -37 59 15.806663916   8.698 8.576     A2V 29 0
17 Cl* NGC 2451 AR 57 * 07 44 29.2664776464 -37 46 44.288661900 13.539 13.459 12.780 12.387 11.989 ~ 13 0
18 NGC 2451B OpC 07 44 30.7 -37 57 14           ~ 92 0
19 2MASS J07443639-3754018 * 07 44 36.3855229512 -37 54 01.848527892   14.245 13.444 12.994 12.520 ~ 11 0
20 CD-37 3850 * 07 44 51.0399330576 -37 40 07.245190776   10.940 10.667 10.748   ~ 17 0
21 CD-37 3853 * 07 44 56.1710075496 -38 00 13.589587332   10.3 9.8     ~ 8 0
22 HD 62974 ** 07 44 59.6805831138 -38 05 39.162239997   8.435 8.302     A3V 29 0
23 CPD-37 1549 * 07 45 00.6064353024 -38 00 01.552067064   12.18 11.68     ~ 7 0
24 CD-37 3859 * 07 45 01.6851326352 -38 02 20.161377996   10.508 10.059 9.817 9.614 ~ 17 0
25 HD 62991 * 07 45 04.7720287128 -37 53 16.344632580 5.76 6.402 6.512     B2V 61 0
26 [HWS2003] X40 X 07 45 05 -37 48.1   16.87 15.49     ~ 2 0
27 CD-37 3862A * 07 45 14.9371224264 -38 11 46.469175540 10.882 10.905 10.424 10.155 9.874 ~ 15 0
28 * c Pup * 07 45 15.2964161 -37 58 06.899807 7.06 5.34 3.61 2.26 1.26 K4III 98 0
29 NGC 2451 126 * 07 45 15.6 -37 54 40   12.82 12.10     ~ 4 0
30 CPD-37 1565 * 07 45 20.9516593224 -37 49 52.921957368 12.353 12.406 11.840 11.511 11.169 ~ 11 0
31 NGC 2451 Cl* 07 45.4 -37 58           ~ 158 1
32 HD 63079 * 07 45 27.3624173688 -37 35 46.630622868   6.857 6.909     B9V 52 0
33 CD-37 3870 * 07 45 38.5491327864 -37 46 41.755495548   12.153 11.513     ~ 17 0
34 Cl* NGC 2451 AR 134 * 07 45 45.8525800056 -37 53 49.976603736   14.167 13.360 12.872 12.314 ~ 9 0
35 [HWS2003] X187 X 07 45 50 -38 33.9   13.42 12.58     ~ 2 0
36 [HWS2003] X3 X 07 46 09 -37 24.8   11.18 10.66     ~ 2 0
37 HD 63216 * 07 46 10.2175479504 -38 06 05.654948652   8.53 8.61     B9V 21 0
38 HD 63215 Be* 07 46 10.5442184088 -37 56 01.239555912   5.755 5.869     B5V 61 0
39 Cl* NGC 2451 PKB 2361 * 07 46 24.8481216792 -38 01 10.602695496 14.299 13.646 12.703 10.098 11.770 ~ 17 0
40 [HWS2003] X108 X 07 46 25 -38 00.1   15.94 14.57     ~ 2 0
41 CD-37 3897 * 07 46 35.5472134440 -38 06 43.843303980   10.33 10.01     ~ 10 0
42 CD-37 3901 SB* 07 46 48.4085499192 -38 08 53.718727236   9.890 9.453 9.191 8.953 ~ 14 0
43 CD-37 3910 * 07 47 25.9396121328 -37 48 15.527894472   11.85 11.37     ~ 9 0
44 [HWS2003] X117 X 07 48 07 -38 02.2   13.40 12.54     ~ 2 0
45 Cl* NGC 2451 PKB 1611 ** 07 48 18.55752 -38 22 38.8128           ~ 6 0
46 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 811 0
47 IC 2602 OpC 10 42 27.1 -64 25 34           ~ 661 0
48 * bet Vir PM* 11 50 41.7185158616 +01 45 53.001539131 4.26 4.15 3.60 3.13 2.85 F9V 920 0

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2023.11.28-10:05:43

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