2001A&A...369..249W


Query : 2001A&A...369..249W

2001A&A...369..249W - Astronomy and Astrophysics, volume 369, 249-262 (2001/4-1)

Orbital motion in T Tauri binary systems.

WOITAS J., KOEHLER R. and LEINERT C.

Abstract (from CDS):

Using speckle-interferometry we have carried out repeated measurements of relative positions for the components of 34 T Tauri binary systems. The projected separation of these components is low enough that orbital motion is expected to be observable within a few years. In most cases orbital motion has indeed been detected. The observational data is discussed in a manner similar to Ghez et al. (1995AJ....110..753G). However, we extend their study to a larger number of objects and a much longer timespan. The database presented in this paper is valuable for future visual orbit determinations. It will yield empirical masses for T Tauri stars that now are only poorly known. The available data is however not sufficient to do this at the present time. Instead, we use short series of orbital data and statistical distributions of orbital parameters to derive an average system mass that is independent of theoretical assumptions about the physics of PMS stars. For our sample this mass is 2.0M and thus in the order of magnitude one expects for the mass sum of two T Tauri stars. It is also comparable to mass estimates obtained for the same systems using theoretical PMS evolutionary models.

Abstract Copyright:

Journal keyword(s): stars: binaries: visual - stars: pre-main sequence - techniques: interferometric

VizieR on-line data: <Available at CDS (J/A+A/369/249): stars.dat tablea1.dat>

Simbad objects: 40

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Number of rows : 40
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 HD 283447 Or* 04 14 12.9261150912 +28 12 12.359055168 13.17 12.07 10.68 9.45 8.67 K3Ve 411 0
2 V* V1098 Tau Or* 04 14 47.9897419517 +27 52 34.232647358   14.08 11.73 10.95   M1 115 0
3 V* FO Tau Or* 04 14 49.2843205392 +28 12 30.505096476       14.92   M3.5e+M3.5e 126 0
4 V* CZ Tau Or* 04 18 31.5898864272 +28 16 58.150241544 15.96 16.60 15.70 14.77   M2 142 0
5 V* FS Tau Or* 04 22 02.1798627024 +26 57 30.575293308 17.57   14.10 15.63   M3.5e+M0e 279 0
6 V* V1201 Tau TT* 04 24 48.1541789688 +26 43 16.062986712   13.53 11.26 10.88   K1 43 0
7 HD 283641 TT* 04 24 49.0452856368 +26 43 10.395844176   12.41 11.42     K0 39 0
8 AG+18 339 Y*O 04 27 05.9787842904 +18 12 37.200405492   9.09 8.73     G5 35 0
9 V* FW Tau Or* 04 29 29.7076208400 +26 16 52.768899480       15.85   M5.5 135 0
10 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1343 0
11 EM* LkHA 331 TT* 04 31 23.814648 +24 10 52.98312   16.30 14.73 14.98   M4.5V 108 0
12 V* XZ Tau Or* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 443 1
13 V* V928 Tau Or* 04 32 18.8875357800 +24 22 26.686742088 17.65 15.978 14.101 13.704   M0.5 96 0
14 V* UZ Tau A TT* 04 32 43.0720716552 +25 52 31.013712120       13.15   M2.0e+M3.0e 124 0
15 V* V807 Tau Or* 04 33 06.6358574736 +24 09 54.977968116   12.10 11.21 11.18   K7 152 2
16 V* IS Tau Or* 04 33 36.7923853128 +26 09 49.068086868 18.52     14.79   M2.0 131 0
17 CoKu HP Tau G2 Or* 04 35 54.1535049648 +22 54 13.426506072 13.63 12.31 11.158 10.14 9.172 G2e 126 0
18 V* HV Tau Or* 04 38 35.2904827968 +26 10 38.640143136           M1Ve 139 0
19 V* IW Tau Or* 04 41 04.7179844751 +24 51 06.034940625   14.25 12.595 11.65 10.504 K7Ve 121 0
20 V* V999 Tau Or* 04 42 05.4915414000 +25 22 56.286176484 18.68 15.1 14.7     M0.6 87 0
21 V* V1000 Tau Or* 04 42 07.3303627320 +25 23 02.932953612 19.09 16.1 15.01     M2.5 80 0
22 EM* LkHA 332 Or* 04 42 07.7851647456 +25 23 11.886259920 17.90 16.51       K7+M2.5 154 1
23 V* V1642 Ori TT* 05 29 20.633592 +00 41 27.99600   13.31 12.31 12.03   K2 45 0
24 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1141 1
25 Ass Cha T 2-54 TT* 11 12 42.6709132056 -77 22 22.943489160     11.103   9.653 G8+K7 91 2
26 CD-27 10549 TT* 15 46 10.7394420672 -28 04 23.422218024   9.57 8.89     K0IV 14 0
27 V* HN Lup Or* 15 48 05.2154956876 -35 15 53.295162846   16.083 14.377 13.726   M3.5e 61 0
28 CD-25 11113 TT* 15 49 20.9990795520 -26 00 06.318844236   11.78 11.116   9.727 K1IVe 28 0
29 RX J1600.5-2027 TT* 16 00 31.3480737649 -20 27 04.999094488   14.8     11.16 M1 24 0
30 V* V1151 Sco BY* 16 01 05.1852470424 -22 27 31.320270432   15.23 13.69 13.38 11.14 M3Ve 33 0
31 RX J1601.7-2049 Y*O 16 01 47.4388749576 -20 49 45.748969788   14.3     10.87 M0 26 0
32 2MASS J16015149-2445249 TT* 16 01 51.4903649252 -24 45 25.061980436   13.4       K7 22 0
33 V* V1154 Sco RS* 16 02 10.4340916128 -22 41 28.824128520   12.46 11.32 10.96   K5+K5 55 0
34 NAME Lupus Complex SFR 16 03 -38.1           ~ 702 0
35 RX J1603.9-2031B TT* 16 03 54.9656958000 -20 31 38.559952200   14.0 13.205 12.20 10.932 M0 24 0
36 RX J160421-21307 TT* 16 04 20.9770582632 -21 30 41.699268144   16.6     11.99 M2 25 0
37 ScoPMS 42a TT* 16 10 28.5604736088 -19 04 47.300449332     13.69     M3V 35 0
38 BD-18 4244 Or* 16 12 40.5144406080 -18 59 28.267620432   12.15 10.829   9.235 K0IV(e) 89 0
39 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1311 1
40 V* TY CrA Ae* 19 01 40.8284458320 -36 52 33.816176040 10.03 9.92 9.39     B9e 284 0

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2023.11.30-01:56:55

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