2009ApJ...705.1416R

Query : 2009ApJ...705.1416R

2009ApJ...705.1416R - Astrophys. J., 705, 1416-1424 (2009/November-2)

A volume-limited sample of 63 M7-M9.5 dwarfs. I. Space motion, kinematic age, and lithium.

REINERS A. and BASRI G.

Abstract (from CDS):

In a volume-limited sample of 63 ultracool dwarfs of spectral type M7-M9.5, we have obtained high-resolution spectroscopy with UVES at the Very Large Telescope and HIRES at Keck Observatory. In this first paper we introduce our volume-complete sample from DENIS and 2MASS targets, and we derive radial velocities and space motion. Kinematics of our sample are consistent with the stars being predominantly members of the young disk. The kinematic age of the sample is 3.1 Gyr. We find that six of our targets show strong Li lines implying that they are brown dwarfs younger than several hundred million years. Five of the young brown dwarfs were unrecognized before. Comparing the fraction of Li detections to later spectral types, we see a hint of an unexpected local maximum of this fraction at spectral type M9. It is not yet clear whether this maximum is due to insufficient statistics, or to a combination of physical effects including spectral appearance of young brown dwarfs, Li line formation, and the star formation rate at low masses.

Abstract Copyright: ∼

Journal keyword(s): stars: kinematics - stars: low-mass, brown dwarfs - stars: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/ApJ/705/1416): table1.dat>

CDS comments: In table 1: 2MASS J0435151-160657 is a misprint for 2MASS J0435161-160657.

Simbad objects: 65

goto Full paper

goto View the references in ADS

Number of rows : 65
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PM J00194+4614 LM* 00 19 26.2642874256 +46 14 07.789543152     20.0     M8 41 0
2 2MASSI J0019457+521317 PM* 00 19 45.8363304736 +52 13 17.579704174           M9 21 0
3 V* DY Psc BY* 00 24 24.6317407560 -01 58 19.954412004     19.42 17.301 15.022 M9.5V 220 1
4 LP 881-64 ** 00 24 44.1774908692 -27 08 25.263232614   17.18 15.338 13.502 11.403 M5.5/6Ve+M8.5Ve+M9/9.5V 154 0
5 LP 349-25 SB* 00 27 56.0057038615 +22 19 32.635434516   18.6   16.0   M8Ve 82 0
6 DENIS J004135.3-562112 LM* 00 41 35.3862348768 -56 21 12.872262132       17.97 14.69 M7.5e 39 0
7 LP 647-13 LM* 01 09 51.2021035859 -03 43 26.390003589   20.9 19.266 17.168 14.708 M9Ve 51 0
8 2MASS J01231125-6921379 LM* 01 23 11.2737421488 -69 21 38.004522552           M8 25 0
9 2MASSI J0148386-302439 PM* 01 48 38.6336504184 -30 24 39.590170524           M7.5 20 0
10 LP 771-21 LM* 02 48 40.9987420224 -16 51 22.123412928       17.721 15.249 M8V 44 0
11 SSSPM J0306-3648 PM* 03 06 11.5989084374 -36 47 52.853856754   20.6 19.2     M8.7V 33 0
12 LP 412-31 LM* 03 20 59.7114769400 +18 54 22.770750621   20.5 18.881 16.904 14.484 M8V 130 0
13 LP 888-18 PM* 03 31 30.2562059055 -30 42 38.825445982   20.0 18.9     M7.5V 38 0
14 LEHPM 3396 LM* 03 34 12.2184742177 -49 53 32.027995648           M9 34 0
15 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 308 0
16 LP 593-68 LM* 03 51 00.0274722419 -00 52 44.922468108   19.8 18.02     M8.0V 74 0
17 2MASSI J0417374-080000 LM* 04 17 37.4940595719 -08 00 00.601208406           M7.5V 24 0
18 RX J0429.3-3124 LM* 04 29 18.4672536672 -31 23 56.743066104       16.2   M5.0Ve 36 0
19 LP 775-31 PM* 04 35 16.1486673944 -16 06 57.213311348     17.820 15.78 13.36 M8Ve 53 0
20 LP 655-48 LM* 04 40 23.2746368923 -05 30 08.125383990   18.9 17.79 15.72 13.36 M7.5Ve 78 0
21 2MASSI J0443376+000205 LM* 04 43 37.6085840376 +00 02 05.106068520     19.6   15.877 M9.0V 72 0
22 LEHPM 2-183 PM* 05 17 37.6991888127 -33 49 03.090270063   21.1       M8.0V 36 0
23 2MASS J05441150-2433018 LM* 05 44 11.5231225298 -24 33 02.517633593           M7.6V 24 1
24 LP 423-14 PM* 07 41 06.7892027539 +17 38 44.847348430   20.6   17.7   M7.0V 37 0
25 LP 423-31 PM* 07 52 23.9250338268 +16 12 14.957934141   17.7 16.73 15.8   M6.0V 60 0
26 LSPM J0818+2333 PM* 08 18 58.0142578714 +23 33 51.585203370   20.5   17.0   M7e 29 0
27 LP 666-9 BD* 08 53 36.1604798120 -03 29 32.197505547     18.959 16.781 14.487 M9Ve 274 1
28 LP 789-23 PM* 10 06 31.9473645332 -16 53 26.307268882   20.3   16.875 14.573 M7.5Ve 29 0
29 LP 315-53 LM* 10 16 34.6688204247 +27 51 48.826153026   19.5 18.946 16.858 14.555 M8V 73 0
30 LSPM J1024+1815 LM* 10 24 09.9507669912 +18 15 53.019085464   20.0   17.1   M7e 21 0
31 LP 731-58 PM* 10 48 12.6142508200 -11 20 09.610693470     15.784 16.01 11.25 M6.5V 198 0
32 DENIS J104814.6-395606 LM* 10 48 14.5736104113 -39 56 06.842743867     17.532 15.051 12.67 M8.5Ve: 141 0
33 Wolf 359 PM* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 775 0
34 LP 732-94 SB* 11 21 49.1708652037 -13 13 08.693807585     19.57     M8.5V 147 1
35 RX J1124.1+3808B LM* 11 24 04.8863943864 +38 08 05.432794728         16.12 M8.5V 25 0
36 LEHPM 2-333 PM* 11 41 44.0489265526 -22 32 15.010503377           M7.5V 24 0
37 LP 851-346 PM* 11 55 42.8518932351 -22 24 58.797393048   19.6     13.203 M7.5V 39 0
38 BR B1222-1221 LM* 12 24 52.1861111523 -12 38 35.704886187           M8e 56 0
39 LP 321-222 LM* 12 46 51.6144758160 +31 48 10.900214430   19.9   17.7   M5V 41 0
40 LP 218-8 LM* 12 53 12.4299447040 +40 34 02.691851911   20.1   17.5   M7Ve 49 0
41 CE 303 LM* 13 09 21.8581120622 -23 30 35.743579378       18.01 14.514 M7e 38 0
42 2MASSI J1332244-044112 PM* 13 32 24.4358275080 -04 41 13.052422824       18.37   M7.5 21 0
43 LP 220-13 PM* 13 56 41.4543005078 +43 42 59.080742558   20.4   17.3   M8V 42 0
44 LSPM J1403+3007 LM* 14 03 22.2897125655 +30 07 54.645699901   21.0   18.8   M9V 39 0
45 2MASSI J1411213-211950 LM* 14 11 21.3050705376 -21 19 50.434499532           M9V 30 0
46 LSPM J1438+6408 BD* 14 38 08.2687791785 +64 08 36.312075315       18.8   L0.2V 32 1
47 LSPM J1440+1339 BD* 14 40 22.9219805639 +13 39 22.398721267   20.2   17.6   M7V 30 1
48 LP 914-54 PM* 14 56 38.2634715567 -28 09 48.619153485     17.141 14.863 12.433 M7.0Ve 167 0
49 2MASS J15072779-2000431 PM* 15 07 27.8095759920 -20 00 43.311514500       17.33   M7.5 26 0
50 LP 135-272 LM* 15 21 01.0497945984 +50 53 22.801588116   20.9   18.1   M7.5 35 0
51 2MASS J15345704-1418486 LM* 15 34 56.9323418001 -14 18 49.252078924           M8.6V 35 0
52 2MASSI J1546054+374946 PM* 15 46 05.4098698968 +37 49 45.887257992       18.05   M7.5V 23 0
53 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
54 LP 44-162 LM* 17 57 15.4028425766 +70 42 01.191850031   20.4 18.79 17.0 14.12 M7.5V 43 0
55 LSR J1835+3259 PM* 18 35 37.8801226673 +32 59 53.316099140   20.0   17.1   M8.5V 160 0
56 LP 229-30 LM* 18 43 22.1259892136 +40 40 21.343851516   19.2   16.6   M7.5Ve 70 0
57 2MASSI J2037071-113756 LM* 20 37 07.1564683236 -11 37 57.347936242           M8 24 0
58 2MASSW J2206228-204705 SB* 22 06 22.8297746064 -20 47 06.597790152     19.788 17.452 14.877 M8.0V 50 0
59 DENIS J222644.3-750342 LM* 22 26 44.4157216320 -75 03 42.533035596         15.21 M8 23 0
60 G 216-7B LM* 22 37 32.5521252189 +39 22 39.327230643       19.2   M9.5 33 0
61 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0
62 APMPM J2331-2750 PM* 23 31 21.7441281210 -27 49 49.608010738   20.4 19.072 16.540 14.190 M7.0V 36 0
63 LP 523-55 LM* 23 49 48.9971841720 +12 24 38.418682284   20.7   18.5   M8.0V 30 0
64 SSSPM J2352-2538 LM* 23 51 50.4633005025 -25 37 36.861356975           M9e 50 0
65 DENIS J235359.4-083331 PM* 23 53 59.4572638456 -08 33 31.685096490       18.251 15.834 M8.6V 26 0

To bookmark this query, right click on this link: simbad:objects in 2009ApJ...705.1416R and select 'bookmark this link' or equivalent in the popup menu