2004ApJ...614L.125S

Query : 2004ApJ...614L.125S

2004ApJ...614L.125S - Astrophys. J., 614, L125-L127 (2004/October-3)

On Ca II emission as an indicator of the age of young stars.

SONG I., ZUCKERMAN B. and BESSELL M.S.

Abstract (from CDS):

Chromospheric emission in the Ca II H and K lines has often been used as an age diagnostic for solar mass stars. For 20 such stars with ages less than a few hundred megayears, we compare Ca II ages derived by Wright et al. with ages we derive based on a combination of lithium abundance, X-ray activity, and Galactic space motion. Typically, the Ca II ages are noticeably older than the lithium/X-ray ages, suggesting that a recalibration of the Ca II ages may be necessary.

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Journal keyword(s): Stars: Activity - Stars: Fundamental Parameters

Simbad objects: 28

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Number of rows : 28
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 NAME Tuc Moving Group MGr 00 00 -64.0           ~ 71 0
2 HD 105 PM* 00 05 52.5447817152 -41 45 11.044988352   8.13 7.53     G0V 178 0
3 HD 377 PM* 00 08 25.7454555168 +06 37 00.489407808   8.22 7.59   6.90 G2V 148 0
4 HD 984 ** 00 14 10.2528328224 -07 11 56.812684848   7.82 7.32     F7V 98 0
5 BD-12 243 Er* 01 20 32.2680172224 -11 28 03.727949952   9.19 8.39     G9V 94 1
6 V* V450 And BY* 02 12 54.9880706976 +40 40 06.200020272   7.880 7.21 7.71   G5V 102 1
7 HD 13531 BY* 02 13 13.3350408936 +40 30 27.317912976   8.06 7.36     G7V 81 0
8 HD 14082B BY* 02 17 24.7369490496 +28 44 30.411007188   8.33 7.74     G2V 110 0
9 HD 14082 BY* 02 17 25.2869702592 +28 44 42.145069812   7.545 7.031 8.04   F5V 123 0
10 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3435 0
11 HD 25457 TT* 04 02 36.7442719512 -00 16 08.119921152   5.88 5.38     F7V 265 0
12 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3074 0
13 V* AF Lep RS* 05 27 04.7633281608 -11 54 03.466002240   6.832 6.295     F8V(n)k: 242 0
14 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1021 0
15 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1905 1
16 HD 77407 PM* 09 03 27.0837288552 +37 50 27.493558584   7.63 7.04     G0V 103 0
17 HD 90905 PM* 10 29 42.2298999216 +01 29 28.037560668       6.5   G1V 90 0
18 IC 2602 OpC 10 42 27.1 -64 25 34           ~ 675 0
19 V* V419 Hya BY* 10 43 28.2715703736 -29 03 51.432666948 9.144 8.596 7.719 7.232 6.806 K1V 183 0
20 HD 107146 PM* 12 19 06.5018840304 +16 32 53.867731128   7.61   6.7   G2V 276 0
21 HD 122652 PM* 14 02 31.6383121656 +31 39 39.089147004   7.69 7.15     F8 87 0
22 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 774 0
23 V* EK Dra BY* 14 39 00.2104038120 +64 17 29.979649860   8.243 7.604     G5VFe-0.7CH-1(k) 444 0
24 HD 152555 PM* 16 54 08.1433547448 -04 20 24.661056912   8.42 7.82     F8/G0V 94 0
25 HD 202917 Er* 21 20 49.9576157736 -53 02 03.155667216   9.32 8.67   7.882 G7V 171 0
26 HD 206387 PM* 21 41 43.7102155224 +06 25 15.008127096   9.070 8.397 8.79   G5 43 0
27 HD 207129 PM* 21 48 15.7511634187 -47 18 13.017893348   6.18 5.58     G2V 328 0
28 HD 218739 PM* 23 09 58.8746249256 +47 57 33.852404232       6.7   G1V 73 0

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