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82 CHAPTER

4

SECOND-ORDER THEORY

OF

EQUILIBRIUM FIGURES

o

FIGURE 4.3: lliustrating the computation of

V;

The trick is to leave Ip but to calculate V first at a point p. which lies on the radius vector of P but outside Sp in such a way that r '

<

r is always satisfied (Fig. 4.3).

Thus we compute

( 4-9)

(the interchange of sum and integral oifers no problem because of the absolute con- vergence of the integrand series). Since

V;(P.)

is harmonie, the shell between Sp and S being disregarded for the time being, and because of rotational symmetry, (4-9) must necessarily have the form (1-37) with zonal harmonies only:

or

V;(P.)

=

Ko(q) + K

2

(q) P

2(cos(J)

+ K

4

(q) P

4(cos(J)

r r3 r6 ( 4-10)

neglecting higher-order terms. Here r, (J, ). are the spherical coordinates of p. as usual; because of rotational symmetry there is no explicit dependence on longitude >- (no tesseral terms); and there are only even-degree zonal terms because of symmetry with respect to the equatorial plane. The coefficients Kn evidently depend on Sp and hence on its label q.

4.1.2 Change of Variable

The equation of any surface of constant density may be written as

T

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III III

as usual; because of rotational symmetry there is no explicit dependence on longitude &gt;- (no tesseral terms) ; and there are only even-degree zonal terms because of symmetry

SECOND-ORDER THEORY

as usual; because of rotational symmetry there is no explicit dependence on longitude &gt;- (no tesseral terms) ; and there are only even-degree zonal terms because of symmetry

III III

as usual; because of rotational symmetry there is no explicit dependence on longitude &gt;- (no tesseral terms) ; and there are only even-degree zonal terms because of symmetry