B U L L E T I N

ASTRONOMIQUE DE BELGRADE



YU ISSN 0354-2955



Bulletin Astronomique de Belgrade No 156, Belgrade, 1997.



C O N T E N T S



Original scientific papers:
C. Blaga The equilibrium of polytropes in poloidal magnetic fields 1
M. Marjanov Gravitational resonances 9
V. Mioc
M. Stavinschi 		The Schwarzschild problem: A model for the motion in the Solar system 21
D. Selaru
D. Mihai
V. Mioc 		Collision and escape in Einsteins's PN field 27
S. Ninkovic An interpretation of the de Vaucouleurs empirical formulae 33
M. M. Cirkovic
S. Samurovic
D. Ilic
J. Petrovic 		On the total absorption cross-section of galaxies 37
V. Milosavljevic
S. Djenize 		On the Stark broadening parameters of the two N II spectral lines of the 3d-4f transition 43
Z. Knezevic
B. Jovanovic 		Is the chaotic clock ticking correctly? 47
G. Damljanovic
N. Pejovic
D. Djurovic 		The Chandler nutation for the period 1949--1985 71
K. Vracaric A new approach to the estimation of the dispersion components 79
K. Vracaric Illogicalities of estimating dispersion parameters by MINQUE method 85
Review papers:
P. Paquet
V. Dehant
C. Bruyninx 		Earth rotation observations and their geophysical implications 89
Preliminary reports:
Dj. Bozhichkovich The "east - west" differences in the declination observations with the Belgrade Vertical Circle 109
M. S. Dimitrijevic
S. Sahal-Brechot 		Stark broadening parameter tables for Si XI and Si XIII 113
M. S. Dimitrijevic
S. Sahal-Brechot 		Stark broadening parameter tables for Ca IX and Ca X 149
L. C. Popovic
M. S. Dimitrijevic 		Tables of the electron-impact broadening parameters: Mn II, Mn III, Ga III, Ge III and Ge IV lines 173
D. Olevic
P. Jovanovic 		Recalculation of 5 double stars orbits 179
G. M. Popovic
R. Pavlovic
V. Zivkov 		Orbital elements of 6 double stars 189
Professional papers:
M. S. Dimitrijevic Milutin Milankovic in science citation index 1946 -- 1996 205





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