Probing Be star disks: new insights from Hα spectroscopy and detailed numerical models

Hα high resolution spectroscopy combined with detailed numerical models is used to probe the physical conditions, such as density, temperature, and velocity of Be star disks. Models have been constructed for Be stars over a range in spectral types and inclination angles. We find that a variety of li...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2010-07, Vol.6 (S272), p.398-399
Main Authors: Jones, Carol E., Tycner, Christopher, Silaj, Jessie, Smith, Ashly, Sigut, T. A. Aaron
Format: Article
Language:English
Subjects:
Contributed Papers
Density
Disks
Inclination
Line shape
Mathematical models
Spectra
Spectroscopy
Stars
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Summary:Hα high resolution spectroscopy combined with detailed numerical models is used to probe the physical conditions, such as density, temperature, and velocity of Be star disks. Models have been constructed for Be stars over a range in spectral types and inclination angles. We find that a variety of line shapes can be obtained by keeping the inclination fixed and changing density alone. This is due to the fact that our models account for disk temperature distributions self-consistently from the requirement of radiative equilibrium. A new analytical tool, called the variability ratio, was developed to identify emission-line stars at particular stages of variability. It is used in this work to quantify changes in the Hα equivalent widths for our observed spectra.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921311010908