Trigonometric parallaxes determined with the Yerkes Observatory 40 inch refractor. VI - Measurements made with PDS microdensitometers

Details Trigonometric parallaxes determined with the Yerkes Observatory 40 inch refractor. VI - Measurements made with PDS microdensitometers Trigonometric parallaxes determined with the Yerkes Observatory 40 inch refractor. VI - Measurements made with PDS microdensitometers

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1451v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, June 1986, p. 1451-1455. NSF-supported research.

Astronomy and Astrophysics

Astronomy

8

Astrometry, Data Reduction, Stellar Parallax, Electrophotometers, Microdensitometers

Scientific paper

Thirteen Yerkes Observatory 40 in. parallax series have been measured on PDS microdensitometers and reduced using digital image-centering techniques and more rigorous reduction methods. An approach for determining a priori plate and star weights is discussed which is based in part on the measurement uncertainties in each image. New parallax-reduction programs have been written that solve for the plate constants and the parallaxes and proper motions iteratively, and realistic estimates have been derived for the error of the image positions. The application of these modifications to the abovementioned Yerkes parallax series yields an average accuracy for the parallaxes of ± 0."10043 (s.e.) for a 24.5 plate single-exposure-per-plate series. This figure represents a 30% improvement over our previous results. We also find from a comparison with U.S. Naval Observatory parallaxes that our internal and external accuracies are identical.

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