Publications of the Astronomical Society of the Pacific 21-22
Publications of the Astronomical Society of the Pacific 21-22
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In our eReader you can find the full English version of the book. Read Publications of the Astronomical Society of the Pacific 21-22 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Publications of the Astronomical Society of the Pacific 21-22
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Harvard College Observatory has catalogued forty-one stars whose spectra are composite, — that is, each spectrum is the sum of two spectra. It has not been possible to classify the fainter spectrum in all cases, but of those completely described the fainter spectrum is of an earlier type than the brighter spectrum, with, I believe, seven or eight exceptions ; and in two of these the spectral types differ but slightly.
It is characteristic of the well-known visual double stars of unequal magnitu...de that the fainter component is bluer than 6o Publications of the the brighter component ; that is, the fainter component has the earHer type of spectrum. There appear to be a few exceptions to this rule.
All these facts appear to be in harmony with the following hypothesis: The nebula which gives rise to a binary system, through fission, divides into two masses, usually not very unequal, and the spectra at first are substantially of the same type. Because the masses are nearly equal, the chances for observing both spectra are favorable.
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To quickly assess the difficulty of the text, read a short excerpt:
Harvard College Observatory has catalogued forty-one stars whose spectra are composite, — that is, each spectrum is the sum of two spectra. It has not been possible to classify the fainter spectrum in all cases, but of those completely described the fainter spectrum is of an earlier type than the brighter spectrum, with, I believe, seven or eight exceptions ; and in two of these the spectral types differ but slightly.
It is characteristic of the well-known visual double stars of unequal magnitu...de that the fainter component is bluer than 6o Publications of the the brighter component ; that is, the fainter component has the earHer type of spectrum. There appear to be a few exceptions to this rule.
All these facts appear to be in harmony with the following hypothesis: The nebula which gives rise to a binary system, through fission, divides into two masses, usually not very unequal, and the spectra at first are substantially of the same type. Because the masses are nearly equal, the chances for observing both spectra are favorable.
What to read after Publications of the Astronomical Society of the Pacific 21-22?
You can find similar books in the "Read Also" column, or choose other free books by Astronomical Society of the Pacific to read onlineMoreLess
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