Stellar Distances and Hipparcos
نویسندگان
چکیده
منابع مشابه
Hipparcos Distances of X-ray Selected Stars: Implications on Their Nature as Stellar Populations
We present the parallaxes, measured by Hipparcos, for a sample of X-ray selected stars. The stars belong to the stellar sample of the Einstein Extended Medium Sensitivity Survey. They are all at galactic latitude jbj > 20 , and are generally far away from known star forming regions. Several of these stars show lithium abundance and activity level typical of very young stars with ages comparable...
متن کاملHipparcos distances of X-ray selected stars: implications on their nature as stellar population
We present the parallaxes, measured by Hipparcos, for a sample of X-ray selected stars. The stars belong to the stellar sample of the Einstein Extended Medium Sensitivity Survey. They are all at galactic latitude |b| > 20 deg, and are generally far away from known star forming regions. Several of these stars show lithium abundance and activity level typical of very young stars with ages compara...
متن کاملStellar models and Hyades : the Hipparcos test
We compare theoretical stellar models for Main Sequence (MS) stars with the Hipparcos database for the Hyades cluster to give a warning against the uncritical use of available theoretical scenarios and to show how formal MS fittings can be fortuitous if not fictitious. Moreover, we find that none of the current theoretical scenarios appears able to account for an observed mismatch between theor...
متن کاملStellar Kinematics from Hipparcos Proper Motions
From Hipparcos proper motions, we have analyzed the local kinematics of the Milky Way from the young O-B5 stars, classical Cepheids, and the late-type K-M giants. Comparing the derived results, the kinematical discrepancies between each subset of stars have been analyzed, and the possible reasons for the kinematical di erences have been discussed.
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: International Astronomical Union Colloquium
سال: 1993
ISSN: 0252-9211
DOI: 10.1017/s0252921100018029