Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541313d&link_type=abstract
American Astronomical Society, AAS Meeting #215, #413.13; Bulletin of the American Astronomical Society, Vol. 42, p.252
Astronomy and Astrophysics
Astronomy
Scientific paper
Zero parallax objects are required to reduce zonal errors of parallax for JMAPS. For most of the sky, ICRF quasars provide stable, zero parallax anchors for astrometry. However, quasars that fulfill JMAPS magnitude and stability requirements cannot be found along the galactic plane because of the high extinction at the JMAPS bandpass. Thus, the zonal errors for JMAPS will grow significantly along the galactic plane unless zero parallax stars can be used as additional reference points. We examine O-stars, Wolf-Rayet stars, and K-giants as potential candidates for JMAPS zero parallax galactic stars. The O-stars cannot serve as zero parallax stars because they are too near-by, nor can the Wolf-Rayet stars because of large distance errors. However, we find several K-giants along the galactic plane at distances greater than 5 kpc that will help tie down zonal errors.
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