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Paper: HST Expansion Parallaxes of Binary Miras
Volume: 318, Spectroscopically and Spatially Resolving the Components of Close Binary Stars
Page: 374
Authors: Munari, U.; Corradi, R.L.M.; Whitelock, P.A.
Abstract: The circumstellar material in the binary and symbiotic Mira He 2-147 takes the form of a well formed torus, while that in He 2-104 appears as two nested hourglasses. Their velocity patterns are well mapped by ground-based spectroscopic observations. We are observing both systems with HST in the [NII] 6584 Å light to obtain first and second epoch high resolution images, from which we will measure the angular expansion and then the distance by comparison with spectroscopic expansion velocities.
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