2001A&A...376..982W


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET12:53:33

2001A&A...376..982W - Astronomy and Astrophysics, volume 376, 982-996 (2001/9-4)

Mass ratios of the components in T Tauri binary systems and implications for multiple star formation.

WOITAS J., LEINERT C. and KOEHLER R.

Abstract (from CDS):

Using near-infrared speckle interferometry we have obtained resolved JHK-photometry for the components of 58 young binary systems. From these measurements, combined with other data taken from literature, we derive masses and particularly mass ratios of the components. We use the J-magnitude as an indicator for the stellar luminosity and assign the optical spectral type of the system to the primary. On the assumption that the components within a binary are coeval we can then also place the secondaries into the HRD and derive masses and mass ratios for both components by comparison with different sets of current theoretical pre-main sequence evolutionary tracks. The resulting distribution of mass ratios is comparatively flat for M2/M1≥0.2, but depends on assumed evolutionary tracks. The mass ratio is neither correlated with the primary's mass or the components' separation. These findings are in line with the assumption that for most multiple systems in T associations the components' masses are principally determined by fragmentation during formation and not by the following accretion processes. Only very few unusually red objects were newly found among the detected companions.This finding shows that the observed overabundance of binaries in the Taurus-Auriga association compared to nearby main sequence stars should be real and not the outcome of observational biases related to infrared observing.

Abstract Copyright:

Journal keyword(s): binaries: general - stars: pre-main sequence - stars: formation - stars: fundamental parameters - techniques: interferometric - infrared: stars

VizieR on-line data: <Available at CDS (J/A+A/376/982): stars.dat tablea1.dat tablea2.dat + 11 figures>

CDS comments: in ref list DUQUENNOY 1991A&A...248..485D instead of A&A...248.285

Simbad objects: 72

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Number of rows : 72

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V679 Tau TT* 03 52 02.2217462456 +24 39 47.690003665   13.57 11.41 11.89 10.77 K5e 117 0
2 2MASS J03542950+3203013 TT* 03 54 29.5045697196 +32 03 01.407089906   12.71 11.85     G0 49 0
3 2MASS J03543017+3203043 TT* 03 54 30.17472 +32 03 04.3488   13.25 12.31     G5 50 0
4 2MASS J04034930+2610520 TT* 04 03 49.308 +26 10 52.03   15.99 14.52     M3.9 63 0
5 2MASS J04035084+2610531 TT* 04 03 50.8393021714 +26 10 53.015575434   15.57 14.17     M2.8 52 0
6 2MASS J04043936+2158186 TT* 04 04 39.3724734118 +21 58 18.564536279   16.54 14.97     M3.4 58 0
7 2MASS J04043984+2158215 TT* 04 04 39.8534209118 +21 58 21.474760489   16.61 15.09     M3.2 49 0
8 HD 283447 Or* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 386 0
9 V* FO Tau Or* 04 14 49.2797479571 +28 12 30.461592529       14.92   M3.5e+M3.5e 115 0
10 V* DD Tau Or* 04 18 31.1271804823 +28 16 29.158626278 15.94 15.49 14.10 13.76   M3.5e+M3.5e 181 0
11 V* CZ Tau Or* 04 18 31.5906879009 +28 16 58.161795569 15.96 16.60 15.70 14.77   M2 131 0
12 V* FQ Tau Or* 04 19 12.812616 +28 29 32.98128       15.00   M3 100 0
13 WK81 1 TT* 04 19 26.2671630797 +28 26 14.259129092   14.81 13.04 12.240   K7 198 1
14 V* V1070 Tau Or* 04 19 41.2688488305 +27 49 48.151086734   13.75 12.25 11.14   M0 136 0
15 V* T Tau TT* 04 21 59.4323326335 +19 32 06.439974179   11.22 10.12 9.80   K0IV/Ve 1336 1
16 V* FS Tau Or* 04 22 02.1925017485 +26 57 30.331063489 17.57   14.10 15.63   M3.5e+M0e 263 0
17 V* FV Tau Or* 04 26 53.5415038432 +26 06 53.942994170 19.58     15.26   K5 127 2
18 CoKu FV Tau c TT* 04 26 54.4012605412 +26 06 50.942995443 20.35   16.70     M3.5e+M2.5e 62 0
19 LDN 1521D DNe 04 27 46.5 +26 18 52           ~ 215 0
20 V* GV Tau TT* 04 29 23.7314759229 +24 33 00.216016292 19.20         K7 274 2
21 V* DI Tau Or* 04 29 42.4736177473 +26 32 49.119618729 16.39 15.20 13.60     M0Ve 198 0
22 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1246 0
23 V* UX Tau B TT* 04 30 03.5778750604 +18 13 49.477040697       13.33   M1Ve 64 0
24 V* UX Tau C TT* 04 30 03.9885439206 +18 13 46.786269979     18.0     M5 35 0
25 V* UX Tau A TT* 04 30 03.9931880444 +18 13 49.476948664   12.92 11.15     K2Ve 333 0
26 V* UX Tau Or* 04 30 03.99626 +18 13 49.4355 11.23 11.84 10.80 9.83 9.05 K2Ve+M1Ve 319 0
27 V* FX Tau Or* 04 30 29.618064 +24 26 45.02724   15.18 13.61 13.21   M4 144 0
28 V* DK Tau A * 04 30 44.2409691803 +26 01 24.730398215           K5Ve 249 0
29 V* DK Tau Or* 04 30 44.243376 +26 01 24.65328 13.32 14.59 13.05 12.08   K7e+K7e 303 0
30 EM* LkHA 331 TT* 04 31 23.814648 +24 10 52.98312   16.30 14.73 14.98   M4.5V 98 0
31 V* XZ Tau Or* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 412 1
32 V* HK Tau Or* 04 31 50.5722969258 +24 24 17.775488652 16.81   15.10     M0.5 302 1
33 V* V710 Tau ** 04 31 57.79848 +18 21 36.9396           ~ 154 0
34 V* V710 Tau A TT* 04 31 57.8032267772 +18 21 34.726898440       13.87   M2/3e 155 0
35 V* V928 Tau Or* 04 32 18.8839760967 +24 22 26.713747659 17.65   13.7     M0.5 84 0
36 [RRN96] GG Tau B Y*? 04 32 30.2772495129 +17 31 30.448743263           M6 47 1
37 V* GG Tau Or* 04 32 30.3318954228 +17 31 40.834888327 14.84 14.78 13.40 11.54   M0e+M2.0e 665 1
38 V* UZ Tau A TT* 04 32 43.0744163742 +25 52 31.022242441       13.15   M2.0e+M3.0e 94 0
39 V* GH Tau Or* 04 33 06.2181025969 +24 09 33.628411049     13.20 12.59   M3Ve 172 0
40 V* V807 Tau Or* 04 33 06.6303920517 +24 09 55.044051684   12.10 11.21 11.18   K7 135 2
41 V* GI Tau Or* 04 33 34.0608378045 +24 21 17.067391746 14.34   13.70 12.15 11.06 K5Ve 259 1
42 V* GK Tau Or* 04 33 34.5626781676 +24 21 05.854541262 15.50   13.00 12.02 10.62 K7:Ve 280 0
43 V* IS Tau Or* 04 33 36.7943820957 +26 09 49.071437296 18.52     14.79   M2.0 117 0
44 V* HN Tau Or* 04 33 39.3612389736 +17 51 52.302839814   14.76 13.40 13.05   K5e 225 0
45 2MASS J04352450+1751429 TT* 04 35 24.5038529437 +17 51 42.495480359   15.680 14.030 13.310   M1.5 50 2
46 NAME CoKu Tau 3 TT* 04 35 40.937952 +24 11 08.49012 20.58         M4.3 93 0
47 Haro 6-28 Or* 04 35 56.8652987075 +22 54 35.826437972 18.94         M3.1 87 0
48 V* VY Tau Or* 04 39 17.4208176970 +22 47 53.361809753     9.00     M0Ve 183 0
49 V* V999 Tau Or* 04 42 05.4896906880 +25 22 56.226737601 18.68 15.1 14.7     M0.6 75 0
50 V* V1000 Tau Or* 04 42 07.3316526430 +25 23 02.928347503 19.09 16.1 15.01     M2.5 73 0
51 EM* LkHA 332 Or* 04 42 07.7923691084 +25 23 11.820801806 17.90 16.51       K7+M2.5 144 1
52 V* UY Aur Or* 04 51 47.3900418279 +30 47 13.552212742 12.82 12.96 11.90 10.59 9.52 M0e+M2.5e 333 0
53 V* RW Aur TT* 05 07 49.5662483 +30 24 05.177426   10.86 9.60 9.95   K1/5e+K5e 728 0
54 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1009 1
55 V* DI Cha Or* 11 07 20.7272524388 -77 38 07.303742740   12.02 10.74 10.72   G2Ve 149 0
56 V* VW Cha Or* 11 08 01.3974165580 -77 42 28.579297348 13.91 14.04 12.80   10.69 K7+M0 169 0
57 V* WX Cha Or* 11 09 58.666944 -77 37 09.03432   14.93 13.85 14.23 12.20 M1+M5 91 0
58 Ass Cha T 2-54 TT* 11 12 42.6696152636 -77 22 22.928829312     11.103   9.653 G8+K7 80 2
59 Sz 65 Or* 15 39 27.7717320499 -34 46 17.209059896   13.11 12.13 11.33 10.76 K7 75 0
60 CD-33 10685 Or* 15 45 12.8670160093 -34 17 30.646921079 12.47 11.56 10.224 9.60 8.685 K3Ve 228 1
61 V* HN Lup Or* 15 48 05.2154956876 -35 15 53.295162846           M3.5e 50 0
62 Sz 77 TT* 15 51 46.9579216483 -35 56 44.112995611   12.0       K5.5 55 0
63 HD 142361 TT* 15 54 59.8690406838 -23 47 18.187188652   9.68 8.960   8.092 G3V 69 0
64 ScoPMS 8b TT* 15 55 17.0380171777 -23 22 16.620980243       14.55   M2.5Ve 17 0
65 THA 15-10 TT* 15 55 50.289888 -38 01 33.50928   16.24 14.88 14.74   M5.1 33 0
66 NAME Lup Cloud SFR 16 03 -38.1           ~ 549 0
67 V* HO Lup Or* 16 07 00.603672 -39 02 19.49316   13.94 13.17 13.03   M1e 62 0
68 ScoPMS 42a TT* 16 10 28.5645122172 -19 04 47.282366707     13.69     M3V 27 0
69 BD-18 4244 Or* 16 12 40.5142870003 -18 59 28.267064720   12.15 10.829   9.235 K0IV(e) 86 0
70 NAME Scorpius Cloud MoC 16 29 00 -19 00.0           ~ 28 0
71 CoKu HK Tau c * ~ ~           ~ 16 0
72 CoKu Haro 6-37 c * ~ ~     14.6     K8 6 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-12:53:33

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