Extraction of Sub-Milliarcsecond Parallaxes from Hipparcos Data

Details Extraction of Sub-Milliarcsecond Parallaxes from Hipparcos Data Extraction of Sub-Milliarcsecond Parallaxes from Hipparcos Data

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..338..232h&link_type=abstract

Astrometry in the Age of the Next Generation of Large Telescopes, ASP Conference Series, Vol. 338, Proceedings of a meeting held

Astronomy and Astrophysics

Astronomy

Scientific paper

The precision of astrometric measurements can, in some cases, be greatly enhanced by incorporation of reliable additional information in a Bayesian formulation. This paper reports an apparently successful such application to Delta Cepheid variables observed with Hipparcos: incorporation of a standard kinematic model reduces the parallax inference error by about a factor of 3, with no apparent bias; allowing reliable inference of Cepheid luminosities and the elimination of formal probabilities of negative parallax.

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