Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976msngr...7...15.&link_type=abstract
The Messenger, vol. 7, p. 15-16
Astronomy and Astrophysics
Astronomy
Scientific paper
A good theory needs a good observational basis. The truth of this statement is accepted by both theoretical and observational astronomers, but the history of astronomy nevertheless shows many theoretical studies which have been founded on insufficient or even inaccurate observations. Our present knowledge of stellar evolution is best visualized as the movements, as time passes by, of stars with different masses and chemical compositions in the Hertzsprung-Russell (temperature versus luminosity) diagram. This theory is very complicated and rests heavily on observations of luminosities, colours and sizes of amazingly few, well-studied stars. Dr. Henning E. Jorgensen of the Copenhagen University Observatory has studied the problems of stellar evolution with fast computers and is weil aware of the necessity of extremely accurate observations in support of the theoretical studies. He explains why eclipsing binary stars are particularly suited for this purpose and informs about some of the recent observations of southern binaries from La Silla.
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