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...
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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...
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I show that the counter-rotating core of the barred galaxy NGC5728 could be explained by the internal dynamics of the bar. This supports the idea that the nuclear bar is counter-rotating.
متن کاملThe Kinematics of Galactic Stellar Disks
The disks of galaxies are primarily stellar systems, and fundamentally dynamical entities. Thus, to fully understand galactic disks, we must study their stellar kinematics as well as their morphologies. Observational techniques have now advanced to a point where quite detailed stellar-kinematic information can be extracted from spectral observations. This review presents three illustrative exam...
متن کاملLocal stellar kinematics from Hipparcos data
From the parallaxes and proper motions of a kinematically unbiased subsample of the Hipparcos catalogue we have redetermined as a function of colour the kinematics of main-sequence stars. Whereas the radial and vertical components of the mean heliocentric velocity of stars show no trend with colour, the component in the direction of galactic rotation nicely follows the asymmetric drift relation...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1937
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/97.6.473