1997/09/03 by M. Crézé, E. Chereul, Crézé, M. +6
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #History and Developments in Astronomy #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9709022
24 pages, 13 figures, latex. To appear in A&A (main journal)
arxiv created 1997/09/03 · openalex publication_date 1997/09/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 Mv=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 ρ0=0.076 ±0.015~M\sun~pc-3 a value well below all previous determinations leaving no room for any disk shaped component of dark matter.