VLBI measurements of the parallax and proper motion of U Herculis

Details VLBI measurements of the parallax and proper motion of U Herculis VLBI measurements of the parallax and proper motion of U Herculis

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999newar..43..575v&link_type=abstract

New Astronomy Reviews, Volume 43, Issue 8-10, p. 575-579.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The OH 1667 maser in the circumstellar shell around the Mira variable U Her has been observed with the VLBA at 6 epochs, spread over 4 years. By using straightforward phase referencing techniques the stellar proper motion can be measured. Preliminary analysis indicates that the parallactic motion is also detected. An important question is whether the maser spots can be assumed to be fixed with respect to the star. The observations show both evidence supporting and contradicting the idea that one maser spot is the amplified stellar image.

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