von Zeipel participated in the expeditions to Spitzbergen 1898,1901,1902.
He was appointed Observator at the Uppsala observatory in 1911, and later received a
personal professorship 1920 - 1938.
von Zeipel worked at the Pulkovo observatory 1901-02, and at the Paris observatory
1904-06 in the fields of celestial mechanics and astrophotography.
His first research area in astronomy was celestial mechanics, also the field
of his dissertation,
- Über die Bestimmung der Integrationsconstanten in der Theorie der Gruppenstörungen.
(AN,153,93,1900)
- Angenäherte Jupiterstörungen für die Hecubagruppe. (1902)
- Recherches sur les solutions périodiques de la troisième sorte dans
le problème de trois corps. (Nova Acta S.S.U., Dissertation,1904)
- Sur les singularités du problème des n corps. (Ark.m.a.f.,1908)
- Recherches sur le mouvement de petites planètes. (1917)
he then turned to stellar statistics,
- Recherches sur la constitution des amas globulaires. (K.V.A.handl.,1915)
- La loi des luminosités dans l'amas globulaire Messier 3. (Ark.m.a.f.,1916)
- Photometrische Untersuchungen der Sterngruppe Messier 37. (K.V.A.handl.,1921)
- Die Bestimmung der Massen der Sterne aus ihrer Verteilung in den
Sternhaufen. (AN,1922)
and during his later years he was one of the leading astronomers in theoretical astrophysics.
- The radiative equilibrium of a rotating system of gaseous masses. (MN,84,665,1924)
- The radiative equilibrium of a slightly oblate rotating star. (MN,84,684,1924)
- The radiative equilibrium of a double-star system with nearly spherical components.
(MN,84,702,1924)
- Zum Strahlungsgleichgewicht der Sterne. (Pr.A.,1925)
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