Continuum IR emission of Be star wind-compressed discs
John M. Porter
Received 20 November 1996 / Accepted 14 January 1997
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 -dimensional (2 -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
© European Southern Observatory (ESO) 1997
Online publication: May 26, 1998