Improving distance estimates to nearby bright stars: Combining astrometric data from Hipparcos, Nano-JASMINE and Gaia
نویسندگان
چکیده
منابع مشابه
Revealing Companions to Nearby Stars with Astrometric Acceleration∗
A subset of 51 Hipparcos astrometric binaries among FG dwarfs within 67 pc has been surveyed with the Near-Infrared Coronagraphic Imager adaptive optics system at Gemini-S, directly resolving for the first time 17 subarcsecond companions and 7 wider ones. Using these data together with published speckle interferometry of 57 stars, we compare the statistics of resolved astrometric companions wit...
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A considerable number of astrometric binaries whose positions on the sky do not obey the standard model of mean position, parallax, and linear proper motion were observed by the Hipparcos satellite. Some of them remain undiscovered, and their observational data have not been properly processed with the more adequate astrometric model that includes nonlinear orbital motion. We develop an automat...
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The velocity distribution f(v) of nearby stars is estimated, via a maximum-likelihood algorithm, from the positions and tangential velocities of a kinematically unbiased sample of 14 369 stars observed by the HIPPARCOS satellite. f shows rich structure in the radial and azimuthal motions, vR and vφ, but not in the vertical velocity, vz: there are four prominent and many smaller maxima, many of ...
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We present a three-dimensional reconstruction of the velocity distribution of nearby stars (. 100 pc) using a maximum likelihood density estimation technique applied to the two-dimensional tangential velocities of stars. The underlying distribution is modeled as a mixture of Gaussian components. The algorithm reconstructs the error-deconvolved distribution function, even when the individual sta...
متن کاملApplication Possibilities for the Hipparcos Intermediate Astrometric Data
Examples of how and when to use the Hipparcos intermediate astrometric data are presented. It is shown how, through the use of the intermediate astrometric data, correlation problems can be properly accounted for. Applications are in general limited to three kinds: calibrations of a common parallax and proper motion for stars in clusters, calibrations of common luminosity properties for stars d...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2012
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921312021849