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Calibration of stellar parameters using high-precision parallaxes

Published online by Cambridge University Press:  01 October 2007

A. G. Butkevich ,
A. V. Berdyugin  and
P. Teerikorpi
A. G. Butkevich*
Affiliation:
Lohrmann Observatory, Dresden Technical University, D-01062 Dresden, Germany email: alexey.butkevich@tu-dresden.de
A. V. Berdyugin
Affiliation:
Tuorla Observatory, Turku University, FIN-21500 Piikkiö, Finland email: andber@utu.fi, pekkatee@utu.fi
P. Teerikorpi
Affiliation:
Tuorla Observatory, Turku University, FIN-21500 Piikkiö, Finland email: andber@utu.fi, pekkatee@utu.fi
*
†On leave from Pulkovo Observatory, 196140 Saint-Petersburg, Russia.
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Abstract

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Utilization of sub-milliarcsecond trigonometric parallaxes shifts the classical problem of calibration of stellar parameters to a new level of complexity. Derivation of stellar luminosity from the parallaxes is not a straightforward task with a number of statistical effects, such as Malmquist bias, to be taken into account. Different methods are to be used in order to derive parameters of luminosity function depending on the nature of underlying stellar sample. It is emphasized that any combination of astrometric parameters (i.e. parallaxes) and astrophysical ones must be handled carefully to avoid or reduce statistical effects, which otherwise may seriously affect the astrophysical applications.

Keywords

stars: distancesstars: fundamental parametersstars: statisticsmethods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 488 - 489
Copyright
Copyright © International Astronomical Union 2008

References

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