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Correction to Absolute Proper Motion Using the IAS-Galaxy Model

Published online by Cambridge University Press:  19 July 2016

Kavan U. Ratnatunga
Kavan U. Ratnatunga*
Affiliation:
NASA Goddard Space Flight Center Greenbelt, Maryland 20771 U.S.A.

Abstract

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The IAS-Galaxy model (Ratnatunga, Bahcall and Casertano 1989) is a software interface between theoretical models of the Galaxy and observed kinematic distributions. It has been developed for analysis of many kinematic catalogs to study global galactic structure. In addition, the IASG model can be used to estimate corrections needed to derive absolute parallax and absolute proper motion by evaluating, on a star-by-star basis, the expected mean motion of the reference stars.

A theoretical Galaxy model is defined on an inertial coordinate frame. Proper motions are measured in a reference frame defined by a fundamental catalog. The observed distribution of proper motions in star catalogs can be directly compared with the expected distributions evaluated using IASG to check the accuracy of the adopted reference frame in realizing the inertial coordinate frame in the sky.

Type
Part 4: Realization and comparison of reference frames
Information
Symposium - International Astronomical Union , Volume 141: Inertial Coordinate System on the Sky , 1990 , pp. 427 - 429
Copyright
Copyright © Kluwer 1990 

References

Ratnatunga, K. U., Bahcall, J. N., and Casertano, S. 1989, Astrophys. J. 339, 106.Google Scholar
Eichhorn, H. 1974, Astronomy of Star Positions (New York: Frederick Ungar), 92.Google Scholar