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Kinematics and M(sub v) calibration of K and M dwarf stars using Hipparcos dataThe luminosities and kinematics of lower main sequence stars in a spectroscopically selected sample covering spectral types K 3 to M 5 are determined using Hipparcos parallaxes and proper motions. The stars separate into two kinematically distinct components, called young disk and old disk components. The young component has velocity dispersion (30, 17, 12) km/s in the U, V and W directions, respectively, and features an asymmetric drift of 8 km/s, a vertex deviation of 10 +/- 3 deg and an absolute magnitude of 10.48 mag at color (R - I)(sub Kron) = 1.0 mag. The respective features of the old component are: (56, 34, 31) km/s, 28 km/s and 0.6 mag at the same color. The slope and intrinsic width of the magnitude calibration of each component are determined. The analysis is used to investigate the possible presence of residual systematic discrepancies of the model with Hipparcos data. There are indications of a possible underestimation of the parallax errors.
Document ID
19980039507
Document Type
Conference Paper
Authors
Upgren, A. R. (Yale Univ. New Haven, CT United States)
Ratnatunga, K. U. (Carnegie-Mellon Univ. Pittsburgh, PA United States)
Casertano, S. (Space Telescope Science Inst. Baltimore, MD United States)
Weis, E. (Yale Univ. New Haven, CT United States)
Date Acquired
August 18, 2013
Publication Date
July 1, 1997
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAGW-4821
CONTRACT_GRANT: NSF AST-95-30770
CONTRACT_GRANT: NAGW-3861
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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