Lick northern proper motion program. II - Solar motion and Galactic rotation

Abstract

view Abstract Citations (55) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Lick Northern Proper Motion Program. II. Solar Motion and Galactic Rotation Hanson, Robert B. Abstract The Lick Northern Proper Motion (NPM) program has been described in Paper I. The NPM reductions for absolute proper motions and positions have been completed for 617 NPM fields, almost completely covering the sky more than ≡10° from the galactic plane between declinations -3° and +68°. To test the accuracy of the NPM proper motions, and to begin their use in galactic structure studies, the author has done solutions for galactic rotation and solar motion. He finds: (1) A = +11.31±1.06 and B = -13.91±0.92 km s-1kpc-1, consistent with a nearly flat galactic-rotation curve with a local circular velocity near 200 km s-1; (2) solar apex locations near the standard apex for low galactic latitudes, but trending strongly toward the direction of galactic rotation for high galactic latitudes; (3) external error estimates for the Lick proper motions: 0arcsec.2 century-1 for the absolute zero point in a typical NPM field, and 0arcsec.06±0arcsec.02 century-1 for the overall systematic zero-point error. Publication: The Astronomical Journal Pub Date: August 1987 DOI: 10.1086/114481 Bibcode: 1987AJ.....94..409H Keywords: Galactic Rotation; Stellar Luminosity; Stellar Motions; Astronomical Photography; Milky Way Galaxy; Northern Sky; Stellar Spectra; Astronomy; ASTROMETRY; STARS: PROPER-MOTION; STARS: STELLAR STATISTICS full text sources ADS | Related Materials (2) Part 1: 1987AJ.....94..501K Part 3: 2004AJ....128.1430H