Ebook: Astrophysics II: Stellar Structure / Astrophysik II: Sternaufbau
- Tags: Physics general
- Series: Encyclopedia of Physics / Handbuch der Physik 11 / 51
- Year: 1958
- Publisher: Springer-Verlag Berlin Heidelberg
- Edition: 1
- Language: English-German-French
- pdf
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.
Content:
Front Matter....Pages II-VIII
Stellar Interiors....Pages 1-74
The Hertzsprung-Russell Diagram....Pages 75-133
Stellar Evolution....Pages 134-295
Die H?ufigkeit der Elemente in den Planeten und Meteoriten....Pages 296-323
The Abundances of the Elements in the Sun and Stars....Pages 324-352
Variable Stars....Pages 353-604
Stellar Stability....Pages 605-688
Magnetic Fields of Stars....Pages 689-722
Th?orie des naines blanches....Pages 723-751
The Novae....Pages 752-765
Supernovae....Pages 766-785
Back Matter....Pages 786-831
Content:
Front Matter....Pages II-VIII
Stellar Interiors....Pages 1-74
The Hertzsprung-Russell Diagram....Pages 75-133
Stellar Evolution....Pages 134-295
Die H?ufigkeit der Elemente in den Planeten und Meteoriten....Pages 296-323
The Abundances of the Elements in the Sun and Stars....Pages 324-352
Variable Stars....Pages 353-604
Stellar Stability....Pages 605-688
Magnetic Fields of Stars....Pages 689-722
Th?orie des naines blanches....Pages 723-751
The Novae....Pages 752-765
Supernovae....Pages 766-785
Back Matter....Pages 786-831
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