2002ApJ...575..484G

Query : 2002ApJ...575..484G

2002ApJ...575..484G - Astrophys. J., 575, 484-492 (2002/August-2)

Brown dwarfs and the TW Hydrae Association.

GIZIS J.E.

Abstract (from CDS):

I report the results of a survey for low-mass (0.030M☉≳M≳0.013M☉) brown dwarfs in the direction of the TW Hya association using the Two Micron All Sky Survey (2MASS). Two late M dwarfs show signs of low surface gravity and are strong candidates to be young, very low mass (M~0.025M☉) brown dwarfs related to the TW Hya association. The object 2MASSW J1207334-393254 is particularly notable for its strong Hα emission. The number of detected brown dwarfs is consistent with the substellar mass function in richer star formation environments. Newly identified late M and L dwarfs in the field are also discussed. Unusual objects include an L dwarf with strong Hα emission, a possible wide M8-M9 triple system, and a possible L dwarf companion to an LHS star.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: TW Hydrae - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 87

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Number of rows : 87
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 PC 0025+0447 BD* 00 27 41.9817343344 +05 03 41.691766608           L1.0 75 0
2 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
3 ITG 17 LM* 04 39 47.4826636728 +26 01 40.690125912     21.556   15.78 M7 109 0
4 L 674-15 PM* 08 12 40.8889728169 -21 33 06.982558553   13.81 12.13 11.75 9.24 M3.5V 130 0
5 LP 666-9 BD* 08 53 36.1604798120 -03 29 32.197505547     18.959 16.781 14.487 M9Ve 274 1
6 BD-11 2741 PM* 09 51 09.6399896923 -12 19 47.479148223 12.595 11.478 10.016 9.078 8.073 dM0.5 131 0
7 LP 609-24 LM* 10 03 19.1591671629 -01 05 08.000660498     21.0   14.94 M7e 36 0
8 G 196-3B BD* 10 04 20.6391105792 +50 22 59.378638152           L3beta 115 0
9 LP 903-20 PM* 10 04 38.7261105618 -33 35 09.524373674       14.14 11.46 M4 24 0
10 2MASSW J1004392-333518 BD* 10 04 39.3212209972 -33 35 19.104681000           L5 20 0
11 2MASS J10120649-3049263 LM* 10 12 06.4854669024 -30 49 26.328822384           M6e 8 0
12 2MASS J10134260-2759586 LM* 10 13 42.6047838984 -27 59 58.631506620           M5.0e 7 0
13 SIPS J1018-2909 BD* 10 18 58.7744603014 -29 09 53.647990110         17.42 L0.3V 17 0
14 2MASS J10321367-4208568 LM* 10 32 13.6838393544 -42 08 56.949671652           M7e 7 0
15 2MASSW J1036530-344138 BD* 10 36 53.0605368096 -34 41 38.377435973           L6 30 0
16 SIPS J1039-4110 LM* 10 39 18.3880877328 -41 10 33.296960424         14.321 M6e 8 0
17 SIPS J1045-2607 LM* 10 45 17.1693295704 -26 07 25.122930204         15.89 M8e 15 0
18 2MASS J10452400-0149576 BD* 10 45 23.9815317869 -01 49 57.762869076       18.797 16.509 L1 51 0
19 2MASS J10460405-3048421 LM* 10 46 04.0511651568 -30 48 42.161480208           M5.5e 2 0
20 DENIS J104814.6-395606 LM* 10 48 14.5736104113 -39 56 06.842743867     17.532 15.051 12.67 M8.5Ve: 141 0
21 2MASS J10520120-5014447 LM* 10 52 01.1744682936 -50 14 44.524688748           M8e 1 0
22 SIPS J1054-8505 LM* 10 54 11.0610061640 -85 05 02.336353125           M8 12 0
23 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
24 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
25 2MASS J11175402-5153027 LP* 11 17 54.0260862312 -51 53 02.774160096       15.62 12.93 MIII 3 0
26 UCAC2 14392410 * 11 19 19.5902327520 -40 38 13.435109304       15.16 12.29 MIII 1 0
27 LP 732-94 SB* 11 21 49.1708652037 -13 13 08.693807585     19.57     M8.5V 147 1
28 2MASSW J1122362-391605 BD* 11 22 36.2457041472 -39 16 05.567375496           L3 11 0
29 CD-33 7795B LM* 11 31 55.2565351569 -34 36 25.242585993     20.40   15.8 M8.5/9e 131 0
30 ATO J173.0574-26.7902 V* 11 32 13.8012251088 -26 47 24.748059912           ~ 4 1
31 2MASS J11352383-4935279 AGN 11 35 23.8401823368 -49 35 27.966843816           ~ 1 0
32 TWA 26 LM* 11 39 51.1378374696 -31 59 21.443660124         15.83 M8e 125 0
33 [MAG2004] 37 C* 11 41 42.3741855984 -33 41 33.217593864   18.5   16.0   C 6 0
34 SCR J1144-4302 LM* 11 44 24.8821796307 -43 02 53.447749090           M6 10 0
35 2MASS J11482591-3809278 LM* 11 48 25.9187633616 -38 09 27.850652928           M5.0 3 0
36 DENIS J114854.2-254441 LM* 11 48 54.2656488048 -25 44 40.529815188         16.57 M8e 7 0
37 2MASS J11530638-2505445 LM* 11 53 06.3921014688 -25 05 44.456499852           M5.0e 3 0
38 2MASS J11553952-3727350 BD* 11 55 39.5361849740 -37 27 35.503012522           L2e 47 0
39 2MASS J12015441-2932487 LM* 12 01 54.4157195544 -29 32 48.977750292       17.505 15.191 M6e 6 0
40 2MASS J12024106-4455381 LP* 12 02 41.0604029136 -44 55 38.073845532   17.82 15.69 15.28 13.37 MIII 2 0
41 2MASS J12055270-3854513 LM* 12 05 52.7010542424 -38 54 51.266273004           M5.0 4 0
42 2MASS J12062349-4017088 LM* 12 06 23.4788835444 -40 17 08.866495186           M8e 6 0
43 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 376 0
44 UCAC2 13762039 * 12 08 24.6936606576 -42 04 00.149272788   17.64 16.04 15.62 13.31 MIII 1 0
45 2MASS J12110245-2614094 QSO 12 11 02.4538458648 -26 14 09.334231908   16.7   16.2   ~ 4 0
46 2MASS J12231348-4925443 LM* 12 23 13.4915260944 -49 25 44.188430700           M5.0 4 0
47 BR B1222-1221 LM* 12 24 52.1861111523 -12 38 35.704886187           M8e 56 0
48 DENIS J122943.0-352302 LP? 12 29 43.0803563832 -35 23 02.486044644         14.41 MIII 3 0
49 2MASS J12373919+6526148 BD* 12 37 39.19632 +65 26 14.8092           T6.5 85 0
50 2MASS J12382927-4056089 C* 12 38 29.2726491888 -40 56 09.104775432       19.6 18.48 C 3 0
51 SIPS J1241-3843 LM* 12 41 08.0537300115 -38 43 12.841720071           M5.0e 6 0
52 SIPS J1241-3153 LM* 12 41 55.2435587641 -31 52 59.565859747           M6.5e 6 0
53 NAME Kelu-1 BD* 13 05 40.1642434199 -25 41 05.712165150         16.85 L2+L3.5 267 0
54 CE 303 LM* 13 09 21.8581120622 -23 30 35.743579378       18.01 14.514 M7e 38 0
55 2MASS J13153094-2649513 BD* 13 15 30.8597827568 -26 49 51.829331165           L5e 52 1
56 SIPS J1324-3508 LM* 13 24 05.5392700550 -35 08 06.687237302         15.87 M6 6 0
57 2MASS J13255804-3620351 LM* 13 25 58.0502730055 -36 20 35.121016828           M5.0e 4 0
58 DENIS J132620.0-272936 BD* 13 26 20.09928 -27 29 37.0932           L5 25 0
59 DENIS J132640.1-421912 LP? 13 26 40.0953375144 -42 19 12.460933740       15.67 13.33 MIII 2 0
60 SIPS J1329-4147 LM* 13 29 01.0080805682 -41 47 13.520251037       19.30 16.95 M9 12 0
61 [MAG2004] 11 C* 13 59 20.6381892936 -30 23 39.456328128     18.46     C 9 0
62 CE 426 LM* 14 20 54.47112 -36 13 22.2636   20.68 18.74     M7e 6 0
63 2MASS J14211873-1618201 LM* 14 21 18.7081180392 -16 18 20.455895844           M8 11 0
64 TVLM 868-53850 LM* 15 00 26.3328610488 -00 39 27.926553456       15.9 13.8 M7V 23 0
65 LP 859-1 LM* 15 04 16.1763702958 -23 55 56.566174303         14.652 M7.5Ve 33 0
66 2MASSW J1507476-162738 BD* 15 07 47.6758255542 -16 27 40.113982846     22.136 18.928 16.579 L5V 216 0
67 TVLM 868-110639 LM* 15 10 16.8245051187 -02 41 08.085982519     20.505 18.035 15.664 M9V 63 1
68 2MASS J15104761-2818234 LM* 15 10 47.6042163408 -28 18 23.468154192           M9 13 0
69 2MASS J15104786-2818174 LM* 15 10 47.8572999576 -28 18 17.519894532           M8e 29 0
70 [MAG2004] 13 C* 15 15 11.0638630392 -13 32 27.984817032     16.20     C 12 0
71 2MASS J15345704-1418486 LM* 15 34 56.9323418001 -14 18 49.252078924           M8.6V 35 0
72 2MASS J15551573-0956055 BD* 15 55 15.7761996222 -09 56 06.039719833           L1.6V 40 0
73 2MASS J15581878-2054187 LM* 15 58 18.7856659176 -20 54 18.914824656           M5.5e 7 0
74 SIPS J1607-0442 LM* 16 07 31.2366603893 -04 42 09.624825478         14.866 M8e 19 0
75 2MASS J16114534-1928132 LM* 16 11 45.3435396216 -19 28 13.136172492           M5.0e 24 0
76 SIPS J1614-1250 LM* 16 14 23.2273251576 -12 50 46.310991108           M7e 5 0
77 [RR90] Oph 2349.8-2601 Or* 16 26 51.2924609616 -24 32 42.001375272           M8.5 57 0
78 SIPS J1632-0631 LM* 16 32 58.8176003672 -06 31 48.396299611         15.879 M7e 19 0
79 2MASS J16353596-1147101 PM* 16 35 35.9642195616 -11 47 10.241759796           M3 1 1
80 2MASS J16452211-1319516 BD* 16 45 22.0921435313 -13 19 52.257875238           L1.5 46 0
81 [MAG2004] 47 C* 16 52 27.7023134160 -16 07 38.326484244           C 5 0
82 VB 8 LM* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 457 0
83 2MASS J16553789+0454308 LM* 16 55 37.89912 +04 54 30.8952           M8e 2 0
84 2MASS J17072343-0558249 ** 17 07 23.43528 -05 58 24.9204       18.9 15.38 M9+L3 36 0
85 SIPS J1832-4435 LM* 18 32 23.8160439832 -44 35 09.088812850           M6e 4 0
86 SIPS J1930-1943 ** 19 30 27.46056 -19 43 49.3104       17.85 14.95 M6.5e 6 0
87 Wolf 922 ** 21 31 18.5690289199 -09 47 26.482273373 14.901 13.670 12.006 10.708 9.038 M4.5V 172 0

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