EDP Sciences logo
Subscriber Authentication Point
Search
Menu
Home All issues Volume 516 (June-July 2010) A&A, 516 (2010) A112 Full HTML
Free Access

 

 

Table 1:

Astrometry of TWA 5 A and B.

Epoch 		JD - Telesope and Band Separation [arcsec] (a) PA (b) Ref.
year 2 450 000 instrument   in RA in Dec total $[^{\circ}]$ (c)
1998.1 863.5 IRTF Speckle K $-0.1 \pm 0.1$ $1.9 \pm 0.1$ $1.9 \pm 0.1$ $357 \pm 3 $ Webb99
      corrected: $-0.1 \pm 0.1$ $1.9 \pm 0.1$ $1.9 \pm 0.1$ $357 \pm 3 $  
1998.3 928.8 HST/Nicmos H $-0.04 \pm 0.01$ $1.95 \pm 0.01$ $1.96 \pm 0.01$ $358.8 \pm 0.1 $ Low99(f)
      corrected: $-0.04 \pm 0.01$ $1.95 \pm 0.01$ $1.96 \pm 0.01$ $358.8 \pm 0.1 $  
1998.5 1007.6 HST/Nicmos HK(d) $-0.038 \pm 0.001$ $1.960 \pm 0.006$ $1.960 \pm 0.006$ $358.89 \pm 0.03$ Wei00
      corrected: $-0.038 \pm 0.001$ $1.960 \pm 0.006$ $1.960 \pm 0.006$ $358.89 \pm 0.03$  
2000.1 1589.6 Keck/KCam H n/a (g) n/a (g) $1.956 \pm 0.012 $ n/a (g) Mac01
      corrected: n/a (g) n/a (g) $1.931 \pm 0.012$ n/a (g)  
2000.1 1596.6 VLT/FORS2 I $-0.091 \pm 0.037$ $1.950 \pm 0.034$ $1.952 \pm 0.05 $ $ 357.3 \pm 1.2$ Neu00
      corrected: $-0.102 \pm 0.037$ $1.925 \pm 0.034$ $1.928 \pm 0.04$ $357.0 \pm 1.3$  
2000.1 1597.6 Keck/KCam JHK $-0.0286 \pm 0.0467$ $1.9538 \pm 0.0320$ $1.954 \pm 0.008 $ $359.16 \pm 1.08$ Bra03
      corrected: $-0.0386 \pm 0.0467$ $1.9288 \pm 0.0321$ $1.9292 \pm 0.057$ $358.85 \pm 1.18$  
2000.3 1651.6 VLT/ISAAC (d) $-0.093 \pm 0.097$ $1.967 \pm 0.096 $ $1.969 \pm 0.091 $ $ 356.8 \pm 3.0$ Neu00
      corrected: $-0.103 \pm 0.097$ $1.944 \pm 0.096$ $1.947 \pm 0.091$ $357.0 \pm 3.1$  
2001.2 1965.0 Gem/Hokupaa H (e) n/a (g) n/a (g) $1.9357 \pm 0.0107 $ n/a (g) Neu01
      corrected: n/a (g) n/a (g) $1.9157 \pm 0.0109$ n/a (g)  
2003.1 2687.8 VLT/NACO $K_{\rm s}$ $-0.076 \pm 0.013$ $1.921 \pm 0.020$ $1.923 \pm 0.020$ $ 357.74 \pm 0.38$ Mas05 (h)
      corrected: $-0.066 \pm 0.013$ $1.924 \pm 0.020$ $1.925 \pm 0.020$ $358.04 \pm 0.48$  
2007.5 4291.0 VLT/NACO $K_{\rm s}$ $-0.123 \pm 0.013$ $1.897 \pm 0.011$ $1.901 \pm 0.011$ $ 356.28 \pm 0.40$ this work
      corrected: $-0.123 \pm 0.013$ $1.882 \pm 0.011$ $1.886 \pm 0.011$ $356.26 \pm 0.58$  
2008.4 4630.5 VLT/NACO $K_{\rm s}$ $-0.130 \pm 0.013$ $1.887 \pm 0.012$ $1.892 \pm 0.012$ $ 356.07 \pm 0.40$ this work
      corrected: $-0.125 \pm 0.013$ $1.883 \pm 0.012$ $1.887 \pm 0.012$ $356.20 \pm 0.50$  

Notes.  a) Corrected values are separations and PA between A and B after correction for photocenter shift of Aa+b due to orbit of Ab around Aa (K07). Separation in $\alpha $ is negative for B west of A, and separation in $\delta $ is positive for B north of A. b) PA is position angle measured from north over east to south. c) References are Lowrance et al. (1999, Low99), Macintosh et al. (2001, Mac01), Weintraub et al. (2000, Wei00), Neuhäuser et al. (2000, Neu00), Webb et al. (1999, Webb99), Neuhäuser et al. (2001, Neu01), Brandeker et al. (2003, Bra03), and Masciadri et al. (2005, Mas05). d) Narrow band filter(s). e) With Wollaston polarimeter. f) Values (listed in the first row for Low99) are those given by Wei00 according to priv. comm. with P. Lowrance, corrected compared to those published in Low99. g) Values not available (not published). h) Mas05 list neither separation nor PA, data reduced by us.


Source LaTeX | All tables | In the text

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.