Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1832a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Sept. 1985, p. 1832-1836.
Astronomy and Astrophysics
Astronomy
10
Cool Stars, Interstellar Matter, Metallic Stars, Stellar Mass Accretion, Stellar Motions, White Dwarf Stars, Kinematics, Radial Velocity, Star Distribution
Scientific paper
The authors use the data base of spectroscopically identified white dwarfs to isolate a sample of cool degenerates with trace metals. The spatial distribution and space velocity components of the white dwarfs projected onto and perpendicular to the galactic plane are compared with the distribution of local interstellar hydrogen. The results are consistent with the metals having been accreted during recent encounters with local density enhancements. However, the limited availability of radial velocities, coupled with uncertainties in the derived abundances, the diffusion times, and in the three-dimensional structure of the local medium, prevent a definitive test of the accretion hypothesis at this time.
Aannestad Per A.
Sion Edward M.
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