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| Paper: |
Global Space Astrometry: Impact on cosmic distance scale |
| Volume: |
167, Harmonizing Cosmic Distance Scales in a Post-Hipparcos Era |
| Page: |
1 |
| Authors: |
Turon, C.; Perryman, M. A. C. |
| Abstract: |
The publication of the Hipparcos data made available an extended data set of unprecedented accuracy, enlarging by two orders of magnitude the quantity and quality of distance and luminosity determinations and the range of observed objects. New calibrations of photometric parallaxes, and of the luminosity of the basic primary distance indicators (calibration of main sequence position with respect to metal and helium content, cluster main sequence fitting, calibration of period-luminosity relations of pulsating variable stars) are being developed, relying on this extended basis of data. The quality of Hipparcos proper motions and their link to an extragalactic system also bring a new insight into cluster membership questions. The perspective opened by a project such as GAIA, providing an astrometric survey at the microarcsec level over a significant part of our Galaxy and even reaching the brightest objects in the closest galaxies of the Local Group, will stimulate a revolution in the methods used to determine cosmic distance scales. |
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