The Spectra Of Stars Of Secchi S Fourth Type Classic Reprint
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The Spectra Of Stars Of Secchi S Fourth Type Classic Reprint
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Author : George Ellery Hale
language : en
Publisher: Forgotten Books
Release Date : 2017-11-26
The Spectra Of Stars Of Secchi S Fourth Type Classic Reprint written by George Ellery Hale and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-26 with Science categories.
Excerpt from The Spectra of Stars of Secchi's Fourth Type The possibility of basing a systematic scheme of stellar evolution on spectroscopic observa tions is foreshadowed in the work of Fraunhofer, who in 1823 observed for the first time the spectra of a few of the brightest stars. Though wholly ignorant of the origin of the dark lines in these spectra, Fraunhofer recognized that their number, appearance, and grouping differed greatly from star to star, and that in certain cases the solar spectrum seemed to be exactly duplicated. But it required such a general survey as that of Secchi, who examined the spectra of more than four thousand stars, to afford any basis for a scheme of classification. The purely empirical classification which he adopted includes a very large percentage of the stars among its five principal types, and subsequent systems have done little more than to add subgroups to provide for the comparatively few peculiar spectra which do not fall within Secchi's divisions. Secchi's classification, as we have said, was a purely empirical one, intended to serve only as a convenient means of grouping similar spectra. But the researches of Huggins and Vogel soon intro duced the idea of development, and the changes of spectra from type to type came to be regarded as synonymous with progressive changes in the stars themselves. Spectroscopists have agreed in regarding the white stars, with spectra characterized by the predominance of the series of hydrogen lines (secchi's first type), as representing an early stage of development, corresponding to a condition of low density. Through the continued action of gravity, accompanied by loss of heat, the absorbing metallic vapors increase in density, producing a marked increase in the number and strength of the metallic lines, while the hydrogen lines become narrower and less conspicuous (secchi's second type). The reduction of light caused by the greater absorption is most marked at the violet end of the spectrum, causing the color of the star to change from white to yellow. After passing this, the solar, stage, further operation of the same causes results in the production of red stars, whose spectra might be expected to indicate comparatively low temperature and high density of the absorbing vapors. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
The Spectra Of Stars Of Secchi S Fourth Type
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Author : George Ellery Hale
language : en
Publisher:
Release Date : 1902
The Spectra Of Stars Of Secchi S Fourth Type written by George Ellery Hale and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1902 with categories.
Spectra Of Stars Of Secchi S Fourth Type
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Author : George Ellery Hale
language : en
Publisher:
Release Date : 1899
Spectra Of Stars Of Secchi S Fourth Type written by George Ellery Hale and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1899 with Stars categories.
The Spectra Of Stars Of Secchi S Fourth Type
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Author : George E. Hale
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2015-12-02
The Spectra Of Stars Of Secchi S Fourth Type written by George E. Hale and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-02 with Fiction categories.
The Spectra of Stars of Secchi's Fourth Type by George E. Hale. This book is a reproduction of the original book published in 1908 and may have some imperfections such as marks or hand-written notes.
The Spectra Of Stars Of Secchi S Fourth Type
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Author : George Ellery Hale
language : en
Publisher:
Release Date : 1902
The Spectra Of Stars Of Secchi S Fourth Type written by George Ellery Hale and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1902 with categories.
The United States Catalog
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Author : Marion E. Potter
language : en
Publisher:
Release Date : 1906
The United States Catalog written by Marion E. Potter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1906 with American literature categories.
The United States Catalog
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Author :
language : en
Publisher:
Release Date : 1906
The United States Catalog written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1906 with American literature categories.
Nature
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Author : Sir Norman Lockyer
language : en
Publisher:
Release Date : 1899
Nature written by Sir Norman Lockyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1899 with Electronic journals categories.
The American Bookseller
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Author :
language : en
Publisher:
Release Date : 1904
The American Bookseller written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1904 with American literature categories.
The University Of Chicago Press Catalogue Of Books And Journals 1891 1941
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Author : University of Chicago. Press
language : en
Publisher:
Release Date : 1941
The University Of Chicago Press Catalogue Of Books And Journals 1891 1941 written by University of Chicago. Press and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1941 with Bibliography categories.