# 4.7: Other Integrals

Other integrals occurring in the theory of stellar atmospheres are (using the abbreviated notation)

\[H = \frac{1}{4\pi} \int I \cos \theta d \omega = F/ (4\pi) \label{4.7.1}\]

\[= 0 \text{ if isotropic} \label{4.7.2}\]

\[K = \frac{1}{4\pi} \int I \cos^2 \theta d \omega = cP/(4\pi) \label{4.7.3}\]

\[= J/3 \text{ if isotropic}. \label{4.7.4}\]

The SI units for \(F\) are \(\text{W m}^{-2}\). For \(I\), \(J\), \(H\), \(K\) they are \(\text{W m}^{−2} \ \text{sr}^{−1}\). For \(P\) they are \(\text{Pa}\).