1999AJ....117.1471I

Query : 1999AJ....117.1471I

1999AJ....117.1471I - Astron. J., 117, 1471-1484 (1999/March-0)

A near-infrared search for companions around very low luminosity young stellar objects in Taurus.

ITOH Y., TAMURA M. and NAKAJIMA T.

Abstract (from CDS):

We have carried out a near-infrared search for companions around 23 very low luminosity young stellar objects (YSOs) in the Taurus molecular cloud. After sophisticated photometry and analysis, five extremely low luminosity YSO (ELL-YSO) candidate companions were identified by both their near-infrared colors and proximity to the primary (separation less than 6"). They show infrared excess, as do ordinary YSOs. Their absolute J-band magnitudes range from 9 to 12 mag. The masses of these companions are estimated from their J-band luminosities, which use recent evolutionary tracks for very low mass objects. It is found that all are young brown dwarf candidates. The Ks-band magnitude difference between the ELL-YSO candidate companions and their primaries ranges from 2 to 6 mag, significantly larger than observed in T Tauri binaries. It is suggested that the companions are formed by the fragmentation of a disk around the primary. The binary frequency is 22+9–10% for systems with a period ranging between 107-108 days. This frequency is consistent with that of T Tauri stars, but it is significantly higher than that of low-mass main-sequence stars.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: General - Stars: Formation - Stars: Low-Mass, Brown Dwarfs

Nomenclature: Table 6: ITG NN (Nos 1-50). Table 3: ITG NN-FN N=8.

CDS comments: T.6: cross-id 'Kim' not in SIMBAD.

Simbad objects: 66

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Number of rows : 66
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 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
2 Cl* Melotte 22 TEIDE 1 LM* 03 47 17.9147300712 +24 22 31.746313740         19.26 M8.0 107 0
3 HD 283550 * 04 18 27.8350294656 +25 00 14.073011064 9.530 9.040 8.510     A2 23 0
4 ITG 1 Or* 04 37 56.7160390776 +25 46 22.849525920           ~ 23 0
5 ITG 2 LM* 04 38 00.8670612744 +25 58 57.270431784       20.21 14.71 M7e 50 0
6 ITG 3 Or* 04 38 14.8817157144 +26 11 39.946963668       20.33 17.84 M7e 77 0
7 ITG 4 Y*O 04 38 18.92184 +26 07 23.3040           ~ 2 0
8 ITG 5 Y*O 04 38 20.9848662792 +25 52 01.655250600           F5 5 0
9 V* GM Tau LM* 04 38 21.3383367240 +26 09 13.775325624     17.577   15.04 M6.5 130 0
10 V* DO Tau Or* 04 38 28.5880527336 +26 10 49.467596196 12.78 13.44 12.30 13.01   M1Ve 413 1
11 ITG 8 Y*O 04 38 37.4091462024 +25 48 40.069446516           ~ 1 0
12 ITG 9A * 04 39 00.0135185760 +25 33 07.489131264           ~ 4 0
13 ITG 9B * 04 39 00.0542402136 +25 33 11.862676080           ~ 3 0
14 ITG 10 Y*O 04 39 01.9930704672 +25 49 56.381536632           ~ 1 0
15 ITG 11 Y*O 04 39 13.3360170648 +26 12 44.932663080           ~ 1 0
16 TMR 1C Pl? 04 39 13.89288 +25 53 20.8788           ~ 24 1
17 IRAS 04361+2547 Y*O 04 39 13.89288 +25 53 20.8788           ~ 205 1
18 ITG 13 Y*O 04 39 18.6895250424 +25 37 32.408928228           ~ 3 0
19 ITG 14 Y*O 04 39 37.1600199792 +26 13 15.044021832           ~ 2 0
20 ITG 15B Y*O 04 39 44.2 +25 42 31           ~ 4 0
21 IRAS F04366+2555 LM* 04 39 44.8814235960 +26 01 52.706281404           M5 58 0
22 ITG 16 Y*O 04 39 46.2939397368 +25 57 14.838790320           ~ 2 0
23 ITG 17 LM* 04 39 47.4826636728 +26 01 40.690125912     21.556   15.78 M7 109 0
24 ITG 18 Y*O 04 39 50.2460584392 +25 46 50.111452344           ~ 3 0
25 IRAS 0437+257P08 Or* 04 39 55.7457478224 +25 45 01.941104988           B5 177 1
26 [TOH96] IRAS 04368+2557 NIRS 16 Y*O 04 39 57.08184 +26 05 25.2708           ~ 3 0
27 ITG 21 Y*O 04 40 01.74504 +25 56 29.2272           M6IVe 37 0
28 ITG 23 Y*O 04 40 05.3095030704 +25 53 26.953891836           ~ 6 0
29 ITG 22 Y*O 04 40 05.4891477984 +26 08 30.577130484           ~ 1 0
30 ITG 25B Y*O 04 40 07.71192 +26 05 23.6040           ~ 6 0
31 ITG 24 Y*O 04 40 07.8899136648 +26 07 13.375237944           ~ 2 0
32 IRAS 04370+2559 Or* 04 40 08.0045430960 +26 05 25.434085020           M 72 0
33 ITG 26 Y*O 04 40 28.1175259224 +25 26 55.712447196           ~ 2 0
34 ITG 27 Y*O 04 40 36.9695235792 +25 58 18.303402072           ~ 2 0
35 ITG 28 Y*O 04 40 49.4298587280 +25 19 00.477227172           ~ 2 0
36 ITG 29 Y*O 04 40 55.9023965472 +25 22 03.653441472           ~ 2 0
37 ITG 30 Y*O 04 40 57.0509112360 +26 01 26.822932572           ~ 1 0
38 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
39 IRAS 04379+2534 Y*O 04 41 02.7554367888 +25 39 46.971049932 20.18         M3.0III 15 0
40 ITG 32 Y*O 04 41 04.0979541144 +25 30 21.795104448           ~ 3 0
41 ITG 33B Y*O 04 41 08.09760 +25 56 12.3000           ~ 4 0
42 ITG 33A TT* 04 41 08.2636661832 +25 56 07.358083152           B0III 55 0
43 ITG 34 Or* 04 41 10.7863825080 +25 55 11.538967584       19.28 16.43 M5.5e 61 0
44 IRAS 04381+2540 Y*O 04 41 12.67920 +25 46 35.4216           K0-M2 133 1
45 ITG 36 Y*O 04 41 13.2679594824 +25 18 09.697662612           ~ 2 0
46 ITG 37 Y*O 04 41 17.8746586488 +25 42 06.863288256           ~ 2 0
47 ITG 38 Y*O 04 41 19.0644381480 +25 24 26.805563280           ~ 2 0
48 ITG 39 Y*O 04 41 20.1777725040 +25 34 08.509635948           ~ 2 0
49 ITG 40 Y*O 04 41 24.64440 +25 43 53.0256           M3.5 30 0
50 Haro 6-33 TT* 04 41 38.8257958224 +25 56 26.741499648     18.40     M0.5 140 2
51 ITG 42 Y*O 04 41 40.16592 +25 57 41.2164           ~ 1 0
52 ITG 44 Y*O 04 41 43.1569588056 +25 24 11.498976180           ~ 2 0
53 ITG 43 Y*O 04 41 43.4329214016 +25 33 11.049997428           ~ 2 0
54 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1872 0
55 ITG 45B Y*O 04 41 49.19424 +25 48 16.2648           M0 5 0
56 ITG 45A Y*O 04 41 49.3694189184 +25 48 16.082507952           F5III 4 0
57 ITG 46 Y*O 04 41 56.4266179224 +25 52 54.023742768           ~ 2 0
58 V* V999 Tau Or* 04 42 05.4915414000 +25 22 56.286176484 18.68 15.1 14.7     M0.6 95 0
59 ITG 49 Y*O 04 42 06.1565439672 +25 39 09.882914616           ~ 2 0
60 V* V1000 Tau Or* 04 42 07.3303627320 +25 23 02.932953612 19.09 16.1 15.01     M2.5 88 0
61 EM* LkHA 332 Or* 04 42 07.7851647456 +25 23 11.886259920 17.90 16.51       K7+M2.5 164 1
62 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 623 0
63 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0
64 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
65 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
66 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

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