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Astron. Astrophys. 324, 597-605 (1997)

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Continuum IR emission of Be star wind-compressed discs

John M. Porter

1 Astrophysics, School of Electrical Engineering, Electronics and Physics, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK

Received 20 November 1996 / Accepted 14 January 1997

Abstract

A prescription for the density of a wind compressed disc (WCD) is given and the IR emission of the disc is calculated. The prescription enables emission from WCDs to be calculated simply without recourse to full 2 [FORMULA] -dimensional (2 [FORMULA] -D) modelling of rotating radiatively driven winds. It is shown that the standard WCD model is incapable of representing observed Be star discs.

As a guide for future research, various addenda to the WCD model are considered: internal density structure of the disc, decoupling of the matter and radiation fields in the wind and finally magnetic fields. Of these, it is only a magnetic field which may be sufficient as a suffix to bring the WCD model into line with observations. The magnetic field strength must be tens of gauss to begin to reproduce observations.

Key words: stars: emission-line, Be – stars: circumstellar matter – stars: mass loss – infrared: stars

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© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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