Fig. 2
Schema of the rotationally oblate star with polar radius R⋆, equatorial radius Req, and stellar surface element dS⋆ whose position vector is r (with magnitude r). The vector geff is normal to the stellar surface element dS⋆. The angle ϵ denotes the deviation between the vectors ggrav (which is antiparallel to vector r) and g eff.
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