367 SOBOLEV 



substitution of the potassium ion in micas with the oxonium ion. 

 Sobolev has written a number of articles on theoretical pet- 

 rography: metamorphism, formation of igneous rocks, granit- 

 ization, genesis of lamprophyres, mineral formation at oriented 

 pressure. He stresses the importance of studying femic miner- 

 als of rocks and proposes certain simplified diagrams which 

 facilitate the approximate determination of biotite and horn- 

 blende (by their optical properties) in granitoids. Of special 

 value are the tables of optical orientation of minerals which 

 have been published as a supplement to the text Fedorov Method. 

 Bibliography: 



Petrology of the Siberian Platform. Leningrad: 1936 (Trudy 



Arktich. Inst., 43). 



Introduction to the Mineralogy of Silicates. Lvov: 1949. 



Geology of Diamond Fields of Africa, Australia, Borneo and 



North America. Moscow: 1951. 



The Fedorov Method. Moscow-Leningrad: 1954. 



and others. Petrography of Non-molten Laval Types of the 



Soviet Carpathian Mountains. Kiev: 1955. 

 Office: Institute of Geology of Minerals 



Ulitsa Kopernika 15 

 L'vov, Ukrainian SSR 



SOBOLEV, VICTOR VICTQROV^ICH (Astronomer) 



V. V. Sobolev was born September 2, 1915. In 1938 he gradu- 

 ated from Leningrad University. From 1941 he worked there, 

 becoming a professor in 1948. He was elected, in 1958, a 

 Corresponding Member of the U.S.S.R. Academy of Sciences. 



Sobolev has worked in theoretical astrophysics. He has been 

 concerned with physics of non- stationary stars and the theory 

 of radiative transfer. He presented a theory on the luminosity 

 of moving media, with the help of which he established the physi- 

 cal relationship of giant stars of early and late spectrum class- 

 es. He laid the basis for the theory of a non- stationary radi- 

 ation field. He put forth a theory of shape of spectrum lines 

 with consideration of frequency redistribution. 



Sobolev' s works are also concerned with the physics of 

 gaseous mistiness, and investigation of planetary atmospheres. 

 Bibliography: 



Moving Envelopes of Stars. Leningrad: 1947. (Harvard 



University Press, 1960). 



and others . Course on Astrophysics and Stellar Astronomy 



(A. A. Mikhailov, ed.) Moscow-Leningrad: 1951. 



