Table 2
PPMXL and FGS astrometry of the HD 93129A field.
| PPMXL | FGS | ||||||||||||||||||
| Star | RA (h) | Dec (deg) | μ α | μ δ | ξ | η | μ α | μ δ | |||||||||||
|
|
|||||||||||||||||||
| R1 | 10.7325347 (13) | −59.535576 (19) | −6.6 (2.5) | −0.6 (2.5) | −2.6531 (0.9) | 43.2955 (0.5) | −5.78 (0.29) | 1.54 (0.31) | |||||||||||
| R2* | 10.7322835 (14) | −59.541006 (16) | − | − | −9.5351 (1.0) | 23.4780 (0.5) | −5.78 (0.53) | 1.71 (0.50) | |||||||||||
| R3 | 10.7340882 (13) | −59.541208 (19) | −4.8 (3.2) | 0.6 (3.2) | 39.9186 (1.2) | 23.1199 (0.5) | −6.73 (0.32) | 1.38 (0.36) | |||||||||||
| R4 | 10.7344007 (49) | −59.552781 (74) | 24.6 (17) | 60.5 (17) | 48.0711 (1.1) | −19.2493 (0.5) | −5.34 (0.44) | 2.22 (0.45) | |||||||||||
| R6 | 10.7326563 (13) | −59.560735 (19) | −4.8 (2.1) | 3.0 (2.1) | 0.8902 (1.2) | −47.2647 (0.4) | −6.29 (0.32) | 1.64 (0.34) | |||||||||||
| R7 | 10.7315615 (13) | −59.557925 (19) | −6.6 (2.5) | 1.6 (2.5) | −29.0924 (1.1) | −37.1969 (0.2) | −5.46 (0.29) | 1.60 (0.30) | |||||||||||
| R8 | 10.7296359 (15) | −59.548569 (15) | −6.4 (2.0) | 2.5 (2.0) | −81.8936 (1.6) | -3.6759 (0.3) | −5.53 (0.32) | 2.12 (0.30) | |||||||||||
Notes. “Star”: Reference star identification, same as in Fig. 2. All errors are shown within parenthesis. PPMXL coordinates (J2000): RA in hours, Dec in degrees, with errors in mas. The J2000 FGS tangential plane coordinates, ξ, η, are given in arcsec, relative to the point midway between the binary components; errors are in mas. Proper motions (μ) in mas yr-1, with errors in the same unit.
Reference star 2 is not in the PPMXL catalog, so coordinates from UCAC4 are quoted. The FGS proper motions are based upon FGS data but are constrained by the PPMXL values. The entries in this table serve as the input values for the tangent plane analysis outlined in Sect. 3.
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