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Mira Variables: Statistical Parallaxes, Kinematics and Period–Luminosity Relation

Published online by Cambridge University Press:  12 April 2016

E. Kilpio ,
O. Malkov ,
N. Kharchenko  and
E. Schilbach
E. Kilpio
Affiliation:
Institute of Astronomy, 48 Pyatnitskaya Str., Moscow 109017, Russia
O. Malkov
Affiliation:
Institute of Astronomy, 48 Pyatnitskaya Str., Moscow 109017, Russia
N. Kharchenko
Affiliation:
Main Astrophysical Observatory, Golosiiv, 252650 Kiev, Ukraine
E. Schilbach
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany

Abstract

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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.

Type
Part 2. Variability of High-Luminosity Stars
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 128 - 129
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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