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

Jason P. Aufdenberg; Peter Hasche Hauschildt

doi:10.1117/12.459757

21 February 2003 Testing spherical, expanding, line-blanketed model atmospheres of giant stars with interferometry

Jason P. Aufdenberg, Peter Hasche Hauschildt

Proceedings Volume 4838, Interferometry for Optical Astronomy II; (2003) https://doi.org/10.1117/12.459757
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

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.

Citation Download Citation

Jason P. Aufdenberg and Peter Hasche Hauschildt "Testing spherical, expanding, line-blanketed model atmospheres of giant stars with interferometry", Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); https://doi.org/10.1117/12.459757

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