The APM Proper Motion Project - II. The lower proper motion stars

Details The APM Proper Motion Project - II. The lower proper motion stars The APM Proper Motion Project - II. The lower proper motion stars

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277..820e&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 3, pp. 820-844.

Astronomy and Astrophysics

Astronomy

20

Methods: Data Analysis, Astrometry, Galaxy: Kinematics And Dynamics

Scientific paper

Results are presented from the Automated Plate Measuring (APM) Proper Motion Project. The proper motions are measured from APM scans of Palomar Observatory sky survey and UK Schmidt plates. Details are given regarding the reduction of the data and the removal of systematic errors. The project covers a total sky area of almost 100 deg^2 and has astrometry and photometry for ~170000 stars. The overall accuracy of the proper motions is shown to be 5 mas yr^-1, with an error in the absolute zero point of 0.6 mas yr^-1. Values for the solar motion and differential Galactic motions are presented. Measurements of the red stars yield values of A=19+/-6 and B=-13+/-6 km s^-1 kpc^-1 for the Oort constants. A rotational shear of -21+/-7 km s^-1 kpc^-1 in the z direction for the disc stars was also observed.

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