Back to Volume
Paper: Probing Stellar Photospheres with Long-Baseline Interferometry
Volume: 487, Resolving The Future Of Astronomy With Long-Baseline Interferometry
Page: 35
Authors: Aufdenberg, J. P.
Abstract: Long-baseline interferometry at optical and near-IR bands provides not only the angular sizes and mean effective temperatures of stars but also the means to probe temperature variations across and within stellar photospheres. Spatially resolving the brightness distribution over a slowly-rotating star measures limb darkening, key to determining vertical temperature gradients within the photosphere. These measurements constrain, for example, state-of-the-art stellar atmosphere codes with 3-D convection. There is also the potential to measure limb darkening in hotter stars to better constrain their ionizing fluxes. In low-gravity photospheres, where changes in optical depth correspond to physical depths which are a significant fraction of a star's radius, the interferometric angular sizes are more model dependent than for more compact stars. Accurate and precise measurement of radii for single stars requires both good angular diameters and distances. Many bright interferometric targets lack distances that are good to 1%.
Back to Volume