Parallax and orbital motion of η Cassiopeiae A

Details Parallax and orbital motion of η Cassiopeiae A Parallax and orbital motion of η Cassiopeiae A

Mar 1948

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1948aj.....53..165v&link_type=abstract

Astronomical Journal, Vol. 53, p. 165-168

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Measures on 52 plates with 155 exposures taken on 32 nights give a value of +0.1905" +/- 0.0075" for the relative parallax and a value of 4.94" +/- 0.45" for the semi-major axis of the absolute orbit of eta Cas A. The latter value gives the mass-ratio 0.605 to 0.395; these figures have a probable error of +/- 0.036. The residuals indicate a perturbation, pointing to an unseen companion of eta Cas A.

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