Other
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..542l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, April 1983, p. 542-545.
Other
2
Astrometry, Astronomical Photography, Binary Stars, Stellar Motions, Stellar Parallax, Orbits, Photographic Plates, Visual Observation
Scientific paper
Eight of ten Sproul series of double or suspected multiple systems yield parallaxes with no previously published values from other observatories. Eight systems are unresolved on the photographic plate, one is resolved with the faint component showing magnitude variability, while the remaining system shows elongated images. Only two systems have visual orbit determinations. U CrB, a spectroscopic binary, is suspected to have a distant companion from the orbital period changes, possibly caused by light time variations; the existence of an unseen companion cannot be verified astrometrically with the Sproul data.
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