2003A&A...400..297R

Query : 2003A&A...400..297R

2003A&A...400..297R - Astronomy and Astrophysics, volume 400, 297-302 (2003/3-2)

The field brown dwarf LP 944-20 and the Castor moving group.

RIBAS I.

Abstract (from CDS):

A reliable age estimation for the field brown dwarf LP 944-20 is accomplished through the analysis of its kinematic properties. The space velocities of this star strongly suggest its membership in the so-called Castor moving group. LP 944-20 can be sensibly assumed to have the group's age, which is estimated to be ∼320Myr, and metal content, which is found to be roughly solar. With these new constrains and the available photometry and lithium abundance, current brown dwarf models are put to a test. Using the IR magnitudes and the lithium diagnostics, the models are able to provide a reasonable description of the brown dwarf's properties (to within a few sigma) but yield an age which is roughly 50% larger than our estimate. Possible reasons for this discrepancy are discussed.

Abstract Copyright: ∼

Journal keyword(s): stars: low-mass, brown dwarfs - stars: fundamental parameters - stars: kinematics - stars: individual: LP 944-20

Simbad objects: 27

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Number of rows : 27
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 * kap Phe PM* 00 26 12.2013436436 -43 40 47.390371480 4.22 4.11 3.94 3.78 3.70 A5IVn 151 0
2 2MASSW J0335020+234235 LM* 03 35 02.0907239832 +23 42 35.413750692       17.67   M8.5V 56 0
3 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 290 0
4 * zet Lep * 05 46 57.3413646658 -14 49 19.020570470   3.637 3.525     A2IV-V(n) 296 0
5 MCC 234 PM* 06 07 55.2510248640 +67 58 36.554348208   10.985 9.744 9.385   K6V 53 0
6 HD 51825 ** 06 57 17.58427 -35 30 25.7579   6.670 6.224     F5V 83 0
7 Ruiz 207-61 LM* 07 07 53.2835132233 -49 00 50.299705073     20.99   16.37 M8.8V 48 0
8 * alf Gem A SB* 07 34 35.862828 +31 53 17.79429     1.9     A1.5IV+ 389 0
9 * alf Gem B SB* 07 34 36.100452 +31 53 18.57117     3.0     kA0hA2:mA1IVs 290 1
10 V* YY Gem BY* 07 34 37.4474327544 +31 52 10.179641496 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 855 0
11 G 51-15 Er* 08 29 49.3527921926 +26 46 33.624143059   16.87   14.736   M6.5Ve 296 0
12 V* CV Cnc SB* 08 31 37.422792 +19 23 49.28208   15.1 14.83 13.057   M4.0Ve 85 0
13 V* CU Cnc SB* 08 31 37.5741841080 +19 23 39.398029332   12.83 11.809 11.592   M5Ve 222 0
14 HD 77825 BY* 09 04 20.6940062640 -15 54 51.301830636   9.75 8.758   7.703 K2V 60 0
15 * psi Vel A PM* 09 30 41.9257584910 -40 28 00.590987737   4.25 3.91     ~ 20 0
16 HD 94765 BY* 10 56 30.7993104072 +07 23 18.507477300 8.944 8.252 7.379 6.815 6.442 K0V 106 0
17 HD 119124 PM* 13 40 23.2320964296 +50 31 09.894067644 6.830 6.840 6.320     F7.7V 109 0
18 * alf02 Lib SB* 14 50 52.71309 -16 02 30.3955 2.99 2.90 2.75 2.61 2.57 kA2hA5mA4IV-V 216 0
19 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2687 1
20 HD 181321 SB* 19 21 29.7277723051 -34 59 00.356331012 7.22 7.11 6.48     G2V 139 0
21 * alf Cep PM* 21 18 34.77233 +62 35 08.0681 2.770 2.680 2.460 2.22 2.11 A8Vn 359 0
22 G 263-10 PM* 21 58 24.5152059768 +75 35 20.608452888       10.163   M1V 75 0
23 V* TW PsA BY* 22 56 24.0525564918 -31 33 56.030584767   7.58 6.48     K4Ve 292 0
24 * alf PsA PM* 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1236 3
25 BD+19 5116 ** 23 31 52.17898 +19 56 14.1505 12.737 11.749 10.165 8.982 7.446 M4+M5 452 0
26 BD+19 5116B Er* 23 31 52.5753377942 +19 56 14.005026315   14.8   12.165   M4.0Ve 204 0
27 NAME Castor Moving Group As* ~ ~           ~ 129 1

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