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Distances and absolute magnitudes from trigonometric parallaxes

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 نشر من قبل Frederic Arenou
 تاريخ النشر 1998
  مجال البحث فيزياء
والبحث باللغة English
 تأليف F. Arenou




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We first review the current knowledge of Hipparcos systematic and random errors, in particular small-scale correlations. Then, assuming Gaussian parallax errors and using examples from the recent Hipparcos literature, we show how random errors may be misinterpreted as systematic errors, or transformed into systematic errors. Finally we summarise how to get unbiased estimates of absolute magnitudes and distances, using either Bayesian or non-parametrical methods. These methods may be applied to get either mean quantities or individual estimates. In particular, we underline the notion of astrometry-based luminosity, which avoids the truncation biases and allows a full use of Hipparcos samples.



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