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Showing 1 to 6 of 6 for “"Hipparcos"”.
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Kinematics of T Tauri stars in nearby star forming regions
… is studied using proper motions from the Hipparcos, PPM, ACT, TRC and STARNET proper motion catalogues. Especially the STARNET catalogue is very well suited for this purpose as it provides accurate proper motions for about 4.3 million stars, so that a large number of T Tauri stars is …
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Kinematics of Nearby Subdwarfs And the Luminosity Function of the Galactic Thick Disk
… the sample stars of Carney et al. (1994; CLLA). Hipparcos parallaxes and proper motion and Tycho2 proper motions were combined with radial velocities and metallicities from CLLA. The kinematical behavior is discussed in particular in relation to their metallicities. For stars with metallicity …
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Schwerebeschleunigungen Kühler Sterne
… gravities can be inferred from astrometry (the Hipparcos satellite mission) on a given temperature scale. With the exception of the metal-rich standard star Procyon for which a mild temperature correction is needed to fulfil the ionization balance, excellent consistency is obtained for the …
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Characterization and mitigation of radiation damage on the Gaia Astrometric Field
… global, absolute astrometry. As demonstrated by Hipparcos, the concept is sound. After reviewing the Gaia payload and discussing how astrometric and photometric parameters are determined in practice, we introduce the issue of radiation-induced CTI and how it may be dealt with. The on board …
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Flare stars in the solar vicinity
… to these stars were measured (in most cases by Hipparcos) and they are located at a few to 100 pc. The goal was to detect lithium absorption at 6708 A which all young stars have in common. In addition to the detection of lithium, we want to identify other age indicators such as filling in or …