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| Paper: |
Mira Variables: Statistical Parallaxes, Kinematics and Period-Luminosity Relation |
| Volume: |
203, The Impact of Large-Scale Surveys on Pulsating Star Research, IAU Colloquium 176 |
| Page: |
128 |
| Authors: |
Kilpio, E.; Malkov, O.; Kharchenko, N.; Schilbach, E. |
| Abstract: |
Based on the statistical parallaxes, the mean absolute magnitudes and the spatial kinematical parameters were determined as functions of the periods for Mira variables given in the GCVS-4 and selected stars for which new kinematical data were obtained during the last decade. The BC were derived for the oxygen-rich Miras and the P-L relation was compared with predictions from pulsation theory. The following findings result from this analysis: 1) With respect to Miras, the GCVS-4 is complete down to V=9m. 2) The kinematical and orbital parameters indicate a higher age for the oxygen-rich Miras pulsating with smaller periods. 3) The Mbol-period relation of the oxygen-rich Miras shows a low dispersion and does not depend on the pulsation mode. The resulting P-L relation is a superposition of P-L relations of different pulsation modes. 4) The fraction of the fundamental mode pulsators decreases with increasing pulsation period. |
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