Particle transport and the Lambda Bootis phenomenon. I - The diffusion/mass-loss model revisited

Abstract

view Abstract Citations (43) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Particle Transport and the lambda Bootis Phenomenon. I. The Diffusion/Mass-Loss Model Revisited Charbonneau, P. Abstract In this paper, results of two-dimensional linear time-dependent particle transport calculations in a Lambda Bootis star are presented for two representative elements, titanium and calcium. These demonstrate unambiguously that the inclusion of meridional circulation in the original diffusion/mass-loss model of Lambda Bootis stars has profound consequences on the abundance evolution. More specifically, circulation prevents the appearance, at any epoch of main-sequence evolution, of the underabundance patterns characteristic of Lambda Bootis stars. This indicates that the diffusion/mass-loss model for these objects must be either abandoned or significantly modified. Caveats and possible alternatives are discussed, and a few observational tests are suggested. Publication: The Astrophysical Journal Pub Date: March 1993 DOI: 10.1086/172399 Bibcode: 1993ApJ...405..720C Keywords: Abundance; Astronomical Models; Meridional Flow; Peculiar Stars; Stellar Rotation; Transport Properties; Calcium; Diffusion; Mass Transfer; Stellar Evolution; Titanium; Turbulent Mixing; Astrophysics; DIFFUSION; STARS: ABUNDANCES; STARS: INTERIORS; STARS: MASS LOSS; STARS: PECULIAR; STARS: ROTATION full text sources ADS | data products SIMBAD (1) Related Materials (1) Part 2: 1993ApJ...413..376T