Towards the solution of the λ Bootis problem

Details Towards the solution of the λ Bootis problem Towards the solution of the λ Bootis problem

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.313..547a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 313, Issue 3, pp. 547-552.

Astronomy and Astrophysics

Astronomy

9

Stars: Chemically Peculiar, Circumstellar Matter, Stars: Individual: &Lambda, Bootis

Scientific paper

Having analysed the accretion-based model of the dust-gas separation, which is regarded to be the most promising for the explanation of the anomalous properties of λ Bootis-type stars, we can conclude that: (i) for any reasonable density profiles of the shell, dust grains appear to be decoupled from the gaseous background within the region where the temperature drops to a value that is less than the condensation temperature of heavy elements such as Mg, Ca, Fe, etc; (ii) most likely, in the shell of λ Bootis-type stars only small dust particles (of less than ~10-6cm in size) can be created; (iii) significant alteration of the initial atmospheric chemical composition can take place in the case when the density in the shell changes as ~r-2.

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