# Linear limb darkening coefficient, u

I was wondering if anyone knew of any resources to understand the linear limb darkening coefficient, $u$. That is to say, how the $\theta$-dependent coefficient $u$ (or sometimes $b_{\nu}$) varies with wavelength and with stellar effective temperature.

I've looked at a number of sources, such as Schwarzschild (1906), Milne (1921) and my own lecture notes and others, but nothing on this coefficient? Does anyone know where to even start looking for information of the properties of $u$?

• Could you be a bit more specific? I'm not familiar with this coefficient, but if you properly define u or b_{\nu} I may be able to help. Nov 1 '15 at 13:28
• Have you had any exposure to radiative transfer? Nov 1 '15 at 14:02
• Yes, of course. But it has been a while, but the books that exposed me to it say nothing about this coefficient - though I'm sure it's defined implicitly. Nov 1 '15 at 17:03
• Have you seen this link astro.keele.ac.uk/jkt/codes/jktld.html Nov 2 '15 at 19:02
• @JamesKilfiger I've asked a related question
– uhoh
May 20 '16 at 10:39