2001A&A...379..976M


Query : 2001A&A...379..976M

2001A&A...379..976M - Astronomy and Astrophysics, volume 379, 976-991 (2001/12-1)

Chromospheric activity, lithium and radial velocities of single late-type stars possible members of young moving groups'.

MONTES D., LOPEZ-SANTIAGO J., FERNANDEZ-FIGUEROA M.J. and GALVEZ M.C.

Abstract (from CDS):

We present here high resolution echelle spectra taken during three observing runs of 14 single late-type stars identified in our previous studies (Montes et al. 2001, MNRAS, in press, hereafter Paper I) as possible members of different young stellar kinematic groups (Local Association (20-150Myr), Ursa Major group (300Myr), Hyades supercluster (600Myr), and IC 2391 supercluster (35Myr)). Radial velocities have been determined by cross correlation with radial velocity standard stars and used together with precise measurements of proper motions and parallaxes taken from Hipparcos and Tycho-2 Catalogues, to calculate Galactic space motions (U, V, W) and to apply Eggen's kinematic criteria. The chromospheric activity level of these stars have been analysed using the information provided for several optical spectroscopic features (from the Ca II H & K to Ca II IRT lines) that are formed at different heights in the chromosphere. The Li I λ6707.8Å line equivalent width (EW) has been determined and compared in the EW(Li I) versus spectral type diagram with the EW(Li I) of stars members of well-known young open clusters of different ages, in order to obtain an age estimation. All these data allow us to analyse in more detail the membership of these stars in the different young stellar kinematic groups. Using both, kinematic and spectroscopic criteria we have confirmed PW And, V368 Cep, V383 Lac, EP Eri, DX Leo, HD 77407, and EK Dra as members of the Local Association and V834 Tau, π1 UMa, and GJ 503.2 as members of the Ursa Major group. A clear rotation-activity dependence has been found in these stars.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: chromospheres - stars: late-type - stars: abundances - stars: kinematics - galaxy: open clusters and associations: general

VizieR on-line data: <Available at CDS (J/A+A/379/976): stars.dat table1.dat table4.dat table5.dat>

Simbad objects: 32

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Number of rows : 32
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 V* PW And RS* 00 18 20.8895755560 +30 57 22.129174872   9.78 8.86 8.3 7.78 K2V 116 1
2 * 54 Psc PM* 00 39 21.8053928046 +21 15 01.712899720 7.29 6.71 5.88 5.21 4.82 K0.5V 558 1
3 HD 4628 PM* 00 48 22.9759750919 +05 16 50.209484954 7.22 6.64 5.74 4.99 4.52 K2.5V 480 0
4 * 107 Psc PM* 01 42 29.7625251280 +20 16 06.645657710 6.57 6.08 5.24 4.55 4.12 K1V 532 0
5 HD 17925 RS* 02 52 32.1281856011 -12 46 10.968056223 7.48 6.91 6.05 5.34 4.89 K1V 496 0
6 HD 29697 BY* 04 41 18.8552115035 +20 54 05.446927411 10.064 9.12 7.985 7.313 6.666 K4V 161 0
7 HD 37394 BY* 05 41 20.3356800431 +53 28 51.808818686 7.58 7.07 6.23 5.54 5.11 K1 315 0
8 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1084 1
9 * pi.01 UMa BY* 08 39 11.7046112880 +65 01 15.263122512 6.33 6.26 5.64 5.12 4.79 G0.5V 548 0
10 IC 2391 OpC 08 41 10 -52 59.5           ~ 795 0
11 HD 77407 ** 09 03 27.0837288552 +37 50 27.493558584       6.7   G0V+M3V-M6V 99 0
12 V* LQ Hya BY* 09 32 25.5683895648 -11 11 04.692242760 9.316 8.761 7.891 7.288 6.815 K1Vp 439 0
13 HD 82443 BY* 09 32 43.7594578944 +26 59 18.706023348   7.78   6.6   G9V(k) 237 1
14 HD 105631 PM* 12 09 37.2562252156 +40 15 07.402194612   8.26   7.0   G7V 124 0
15 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 420 2
16 HD 115043 PM* 13 13 37.0081725552 +56 42 29.759356008   7.423 6.813     G1Va 250 0
17 V* EK Dra BY* 14 39 00.2104038120 +64 17 29.979649860   8.243 7.604     G1.5V 424 0
18 HD 134319 BY* 15 05 49.9038303360 +64 02 49.941702888   9.05 8.41 8.0   G5V: 123 0
19 HD 151877 PM* 16 48 35.5141646014 +37 00 48.123002986   9.22   7.9   K0V 87 0
20 HD 159222 PM* 17 32 00.9920372760 +34 16 16.133732796 7.38 7.21   6.1   G1V 227 0
21 * bet Oph PM* 17 43 28.3526482 +04 34 02.295484 5.150 3.930 2.750 1.96 1.38 K2IIICN0.5 465 0
22 HD 166620 PM* 18 09 37.4162111401 +38 27 27.998016381 7.86 7.27 6.40 5.63 5.14 K2V 414 0
23 HD 182488 PM* 19 23 34.0131683760 +33 13 19.078425912       5.8   K0V 264 1
24 * eps Cyg ** 20 46 12.6823609 +33 58 12.924926 4.370 3.520 2.480 1.73 1.19 K0III 496 0
25 * 61 Cyg B Er* 21 06 55.2638444466 +38 44 31.358519864 8.63 7.40 6.03 4.86 3.55 K7V 702 1
26 HD 201196 PM* 21 07 33.6436842720 +15 39 31.167330732 8.070 7.290 6.260     K2IV 22 0
27 V* V383 Lac BY* 22 20 07.0254050808 +49 30 11.767337496   9.42 8.58     K1V 76 0
28 HD 219134 Er* 23 13 16.9749603608 +57 10 06.083823619 7.460 6.560 5.570 4.76 4.23 K3V 568 1
29 HD 220140 RS* 23 19 26.6385484104 +79 00 12.673035540   8.43 7.54 7.17 6.76 G9V 139 1
30 NAME Hyades Moving Group MGr ~ ~           ~ 271 0
31 NAME Castor Moving Group As* ~ ~           ~ 125 1
32 NAME Pleiades Moving Group MGr ~ ~           ~ 271 1

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2023.01.26-23:59:21

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