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Multichannel astrometric photometer and photographic astrometric studies in the regions of Lalande 21185, BD 56 deg 2966, and HR 4784
The parallaxes of stars determined from the multichannel astrometricphotometer (MAP) in the regions of Lalande 21185, BD 56 deg 2966, andfrom photographic plates in the region of BD 56 deg 2966 and the regionof HR 4783 and HR 4784 are reported. The parallax determined for Lalande21185, 395.1 +/-1.0 mas yields what is believed to be the most precisedistance modulus (-2.984 +/-0.0055) known for a star other than the sun.The absolute magnitude of Lalande 21185 is found to be 10.474 +/-0.008.No significant evidence of unseen companions is detected. Thephotographic study of BD 56 deg 2966 indicates that the long-term (65yr) motion of the star is linear to better than +/-16 mas, while the MAPstudy indicates that the motion is linear to better than +/-2.5 mas overa period of some 5 yr. The photographically determined parallaxes arecompared with those observed with the MAP. The photographicallycalculated standard errors are found to be in agreement with thestandard error of the differences.
| Spectral types and luminosity classifications of MAP region stars using UBVRI and DDO photometry
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1989AJ.....98.1768C&db_key=AST
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