Fig. 2
Core of Tr 14 and the selected FGS reference stars used in the astrometric measurements. The image (in log stretch) is from HST proposal 10 602 using ACS/WFC with F550M, which is similar to the central pass band of the FGS measurements. The two stars HD 93129A and HD 93129B, separated by 2.7”, are not clearly resolved in this image since the roll angle of HST at the time caused their position angle to be aligned with the diffraction spike. In this image the components of HD 93129A are not resolved. The separation between HD 93129A and HD 93128 is about 24”. North is up and east to the left.
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