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Title:
The distribution of nearby stars in phase space mapped by Hipparcos. I. The potential well and local dynamical mass
Authors:
Creze, M.; Chereul, E.; Bienayme, O.; Pichon, C.
Affiliation:
AA(Centre de Donnees astronomique de Strasbourg, CNRS URA1280 11 rue de l'Universite, F-67000 Strasbourg, France; IUP de Vannes, 8 rue Montaigne, BP 561, F-56017 Vannes Cedex, France), AB(Centre de Donnees astronomique de Strasbourg, CNRS URA1280 11 rue de l'Universite, F-67000 Strasbourg, France), AC(Centre de Donnees astronomique de Strasbourg, CNRS URA1280 11 rue de l'Universite, F-67000 Strasbourg, France), AD(Astronomisches Institut Universitat Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland)
Publication:
Astronomy and Astrophysics, v.329, p.920-936 (1998) (A&A Homepage)
Publication Date:
01/1998
Origin:
A&A
A&A Keywords:
GALAXY: KINEMATICS AND DYNAMICS, GALAXY: FUNDAMENTAL PARAMETERS, GALAXY: HALO, SOLAR NEIGHBOURHOOD, GALAXY: STRUCTURE, DARK MATTER
Bibliographic Code:
1998A&A...329..920C

Abstract

Hipparcos data provide the first, volume limited and absolute magnitude limited homogeneous tracer of stellar density and velocity distributions in the solar neighbourhood. The density of A-type stars more luminous than M_v=2. 5 can be accurately mapped within a sphere of 125 pc radius, while proper motions in galactic latitude provide the vertical velocity distribution near the galactic plane. The potential well across the galactic plane is traced practically hypothesis-free and model-free. The local dynamical density comes out as rho_ {0}=0.076 +/-0.015 M_ȯ pc(-3) a value well below all previous determinations leaving no room for any disk shaped component of dark matter. Based on data from the Hipparcos astrometry satellite

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