Linear limb darkening coefficients are taken from tables published by
Van Hamme (1993, AJ 106, 2096).

`limb_stars` Compute limb darkening fit coefficients for all stars.
`limb_star`(*spectrum*_char,*filter*_char)

Function. Return linear limb darkening coefficient integrated over specified bandpass. Example:print, limb_star('G0I','V').

`limb_filter`(*teff*_real,*log(g)*_real,*filter*_char)

Function. Return linear limb darkening coefficient integrated over specified bandpass. Example:print, limbfilter(5500, 0.5, 'R').

Function. Return linear limb darkening coefficient integrated over band pass with specified center and full width (in nm). Example:print, limbband(5000, 0.5, 700, 25).

Function. Return factor to multiply the uniform disk diameter with in order to get a limb darkened diameter using the specified linear limb darkening coefficient. Based on the squared visibility matching at 0.3 and a formula derived by Hanbury Brown (1974, MNRAS 167, 475).

Christian Hummel 2015-04-28