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Astron. Astrophys. 324, 523-533 (1997)
Appendix A: useful analytical formulae for Sect. 3
![[EQUATION]](img196.gif)
![[EQUATION]](img197.gif)
![[EQUATION]](img198.gif)
![[EQUATION]](img199.gif)
![[EQUATION]](img200.gif)
![[EQUATION]](img201.gif)
![[EQUATION]](img202.gif)
![[EQUATION]](img203.gif)
![[EQUATION]](img204.gif)
where ![[FORMULA]](img205.gif)
denotes the modified Bessel function
of the second kind and order ![[FORMULA]](img10.gif)
(see, e.g.,
Abramowitz & Stegun 1972).
© European Southern Observatory (ESO) 1997
Online publication: May 26, 1998
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