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Astrophysik II: Sternaufbau / Astrophysics II: Stellar Structure (English, German, French, Paperback, Softcover reprint of the original 1st ed. 1958)
Marshal H. Wrubel, H. C. Arp, G. R. Burbidge, E Margaret Burbidge, Hans E. Suess, …
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R3,162
Discovery Miles 31 620
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Sects. 12, 13. 89 sequence and that subgiant and fainter stars in
globular clusters have ultraviolet excesses. When dealing with
stars whose physical properties are imperfectly under stood, such
as in globular cluster stars, we cannot rely too heavily on the
empiri cal calibration by the kinds of stars used to define Fig. 5,
to determine their true, unreddened U-B, B-V curve. But if by a
combination of arguments, principally the reddening in the region
of the stars we do known about, we can assign a fairly probable
unreddened U-B, B-V curve to a group of stars about which we know
little, the argument may be turned around. In this case some
information may be gained about the energy envelope of the stars by
examining the differences between the normal two-color index curves
for the unknown group of stars compared to the known. In general
there seem to be two possible causes for different stars defining
different normal sequences in the U-B, B-V plane. One, the relative
energy distribution in the continuum in the U, B and V photometry
bands are different. An example of this is the effect of the Balmer
depression in supergiants. This, of course, requires deviation from
black body radiation curves for one or both groups of stars. This
cause seems to be the dominant effect for very blue, hot stars
where the depression of the continuum by absorption lines is at a
minimum."
The XXth meeting of the IAU in Australia in 1973 made the venue for
the IAU Symposium No. 59 on Stellar Instability and Evolution, at
Mount Stromlo Obser vatory on August 16-18, a very appropriate one.
Many of the current and former staff of Mount Stromlo Observatory
(operated by the Australian National Univer sity) have specialized
in the study of variable stars and it was with considerable
pleasure that Mount Stromlo Observatory accepted the responsibility
of hosting and making the local arrangements for IAU Symposium No.
59. The Scientific Organizing Committee was particularly active in
formulating the program and comprised Drs N. Baker, P. Demarque, M.
Feast, G. Herbig, I. Iben, P. Ledoux, J. Ostriker and E. Schatzman.
The aim of the Committee was to integrate the review and
contributed papers on the particular instability mechanisms
involved, their observational manifestations and their relation to
the internal structure of the star as inferred from its
evolutionary history. The Local Organizing Committee consisted of
Miss P. Petrie and A. W. Rodgers."
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