File:Star spectra by Secchi.jpg
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Summary
| Description |
Secchi's four classes of stellar spectra, from a colored lithograph in a book published around 1870. This shows how someone looking through a spectrograph on a large telescope would see the spectrum from the brightest stars. The spectra would be much fainter for most stars, making for difficult observing. The principal spectral lines are identified underneath by letters that Fraunhofer assigned. Yes there is a typo in figure two, it should say 2nd not 2rd. |
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| Source | http://www.aip.org/history/cosmology/tools/pic-spectroscopy-lithograph.htm |
| Author | Unknown author |
| Permission (Reusing this file) |
Copyright uncertain, but assumed as public domain because of the age of the image |
Licensing
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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File history
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| Date/Time | Dimensions | User | Comment | |
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| current | 06:49, 22 August 2009 | 600 × 879 (92 KB) | Henrykus | {{Information |Description= Secchi's four classes of stellar spectra, from a colored lithograph in a book published around 1870. This shows how someone looking through a spectrograph on a large telescope would see the spectrum from the brightest stars. Th |
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