Spherically-symmetric model stellar atmospheres and limb darkening I

Item

Title
Spherically-symmetric model stellar atmospheres and limb darkening I
Creator
Lester, John B.
Neilson, Hielding R.
Date
2013
Description
The first journal article on stellar atmospheres and limb darkening by Hielding Nielson and John Lester. The abstrat to the article states, "Model stellar atmospheres are fundamental tools for understanding stellar observations from interferometry, microlensing, eclipsing binaries and planetary transits. However, the calculations also include assumptions, such as the geometry of the model. We use intensity profiles computed for both plane-parallel and spherically symmetric model atmospheres to determine fitting coefficients in the BVRIHK, CoRot and Kepler wavebands for limb darkening using several different fitting laws, for gravity-darkening and for interferometric angular diameter corrections. Comparing predicted variables for each geometry, we find that the spherically symmetric model geometry leads to different predictions for surface gravities log g < 3. In particular, the most commonly used limb-darkening laws produce poor fits to the intensity profiles of spherically symmetric model atmospheres, which indicates the need for more sophisticated laws. Angular diameter corrections for spherically symmetric models range from 0.67 to 1, compared to the much smaller range from 0.95 to 1 for plane-parallel models."
Neilson, H.R. and Lester, J.B. (2013). Spherically-symmetric model stellar atmospheres and limb darkening. I. Limb-darkening laws, gravity-darkening coefficients and angular diameter corrections for red giant stars. Astronomy & Astrophysics, 554(A98): 1-11.
Rights
Astronomy & Astrophysics
Source
University of Toronto Mississauga Library
Item sets
Space & Discovery
Site pages
Space and Discovery