Testing spherical, expanding, line-blanketed model atmospheres of giant stars with interferometry

Details Testing spherical, expanding, line-blanketed model atmospheres of giant stars with interferometry Testing spherical, expanding, line-blanketed model atmospheres of giant stars with interferometry

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4838..193a&link_type=abstract

Interferometry for Optical Astronomy II. Edited by Wesley A. Traub. Proceedings of the SPIE, Volume 4838, pp. 193-201 (2003).

Astronomy and Astrophysics

Astronomy

4

Scientific paper

We show examples of PHOENIX stellar atmosphere model simulations for data obtained by long-baseline optical interferometers. A single spherical, hydrostatic model atmosphere for the M-type giant star γ Sagittae is shown to be in good agreement with interferometric, spectrophotometric, and high-dispersion spectroscopic data sets. In particular we show that the interferometric triple products and wavelength-dependent uniform disk diameters measured by the Navy Prototype Optical Interferometer (NPOI) are well matched by our model. With expanding atmosphere models for the A-type supergiant α Cygni we predict that the center-to-limb intensity profile is sensitive to the mass-loss rate of its stellar wind. For one possible NPOI configuration we show the sensitivity of the squared visibility amplitudes to the model mass-loss rate at spatial frequencies beyond the first null. The importance of hot star photospheric interferometry is discussed.

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