Circumstellar disc geometry constrained by infrared line fluxes

Details Circumstellar disc geometry constrained by infrared line fluxes Circumstellar disc geometry constrained by infrared line fluxes

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.392..383j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 392, Issue 1, pp. 383-390.

Astronomy and Astrophysics

Astronomy

4

Circumstellar Matter, Stars: Early-Type, Stars: Emission-Line, Be

Scientific paper

Lenorzer et al. introduce ratios of hydrogen infrared recombination lines as a diagnostic tool to constrain the spatial distribution and physical condition of circumstellar material around hot massive stars. They demonstrate that the observed line flux ratios Hu14/Brα and Hu14/Pfγ from different types of objects associated with circumstellar material, such as Be stars, B[e] stars, and Luminous Blue Variable (LBV) stars are well separated in a diagnostic diagram. In this paper, we investigate this diagnostic tool using a non-LTE disc code developed by Sigut & Jones focusing on Be discs. We find good agreement between the empirical and predicted locations of Be stars in the Hu14/Brα versus Hu14/Pfγ diagram and show that indeed this diagnostic tool can be used to constrain basic properties of the discs of these stars.

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