منابع مشابه
Inferring stellar properties using colours, parallaxes and an HRD prior
Stellar parameters – effective temperature, metallicity, interstellar extinction etc. – are typically estimated from a spectrum or multiband photometry. I outline a probabilistic method for estimating stellar parameters which uses not only the spectral energy distribution but also the apparent magnitude, parallax (if available) and the strong constraints provided by the Hertzsprung–Russell Diag...
متن کاملConsequences of Hipparcos Parallaxes for Stellar Evolutionary Models
Three binary systems in the Hyades open cluster (51 Tau, V818 Tau, and θ2 Tau), with known metallicity and good Johnson photometric data are used to test the validity of three independent sets of stellar evolutionary tracks. A statistical method is described and applied to the colour-magnitude diagram of the six selected components, giving rise to χ2-contours in the metallicity–age plane. The e...
متن کاملBayesian inference of stellar parameters and interstellar extinction using parallaxes and multiband photometry
ABSTRACT Astrometric surveys provide the opportunity to measure the absolute magnitudes of large numbers of stars, but only if the individual line-of-sight extinctions are known. Unfortunately, extinction is highly degenerate with stellar effective temperature when estimated from broad band optical/infrared photometry. To address this problem, I introduce a Bayesian method for estimating the in...
متن کاملMicrolens Parallaxes with SIRTF
The Space Infrared Telescope Facility (SIRTF) will drift away from the Earth at ∼ 0.1 AU yr. Microlensing events will therefore have different characteristics as seen from the satellite and the Earth. From the difference, it is possible in principle to measure ṽ, the transverse velocity of the lens projected onto the observer plane. Since ṽ has very different values for different populations (d...
متن کامل20. Verification of Parallaxes
Hipparcos parallaxes will play a major role in the astrophysical applications of the Hipparcos results and in this respect their accuracy is more important than their precision, at least for all the investigations of statistical character. In this Chapter, the systematic errors of the Hipparcos astrometric parameters, including the parallaxes, are evaluated by examining the possible sources of ...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1914
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.19141990905