Other
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177..137m&link_type=abstract
In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 137-138 (SEE N82-30146 20-88)
Other
Astrometry, Esa Satellites, Mira Variables, Satellite Observation, Variable Stars, Mission Planning, Radial Velocity, Stellar Evolution, Stellar Magnitude, Stellar Motions, Stellar Parallax
Scientific paper
The status of proper motion and parallax data on Mira stars is discussed and results expected from Hipparcos are considered. Relative photographic proper motions were measured for long period variables and reduced to absolute, FK3 system. Accuracy is on the order of 0.012 arcsec/yr. Trigonometric parallaxes with relative accuracy better than 100% are available for only 6 Miras. Hipparcos worst proper motion accuracies for stars of magnitude 13 located near the ecliptic plane are comparable to best ground based ones. From the mean luminosity curve, 300 Miras are observable during 70% to 100% of their cycle; 250 more are observable from 50% to 70%. Relative accuracy of parallaxes is better than 50% for 6 stars observable throughout their cycle, and between 50% and 100% for 10 more. Another 40, observable during part of their cycle can be examined. Magnitude variation effects on astrometric accuracy should be considered when preparing observation lists.
Guibert Jean
Mennessier Marie-Odile
Nguyen-Q-Rieu
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