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

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

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405..720c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 405, no. 2, p. 720-726.

Astronomy and Astrophysics

Astrophysics

37

Abundance, Astronomical Models, Meridional Flow, Peculiar Stars, Stellar Rotation, Transport Properties, Calcium, Diffusion, Mass Transfer, Stellar Evolution, Titanium, Turbulent Mixing

Scientific paper

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.

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