HST expansion parallaxes of binary Miras

Details HST expansion parallaxes of binary Miras HST expansion parallaxes of binary Miras

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..318..374m&link_type=abstract

In Spectroscopically and Spatially Resolving the Components of the Close Binary Stars, Proceedings of the Workshop held 20-24 Oc

Astronomy and Astrophysics

Astronomy

Scientific paper

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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