/ftp/cats/3/44



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III/44      Atlas of Stellar Spectra (Johnson 1977-1978)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
	stars.dat atlas.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=III/44
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drwxr-xr-x 259 cats archive 8192 Dec 5 19:00 [Up] drwxr-xr-x 4 cats archive 4096 Jan 12 2023 [TAR file] -rw-r--r-- 1 cats archive 449 Dec 19 2022 .message -r--r--r-- 1 cats archive 4766 Feb 18 2016 ReadMe -rw-r--r-- 1 cats archive 334 Feb 18 2016 +footg5.gif -rw-r--r-- 1 cats archive 3599 Feb 18 2016 +footg8.gif -r--r--r-- 1 cats archive 859605 Oct 28 1993 atlas.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -rwxr-xr-x 1 cats archive 1481 Jan 22 2001 getsp drwxr-xr-x 2 cats archive 4096 Feb 18 2016 icons -r--r--r-- 1 cats archive 6948 Oct 4 1997 readme.old -r--r--r-- 1 cats archive 2386 May 8 1997 starlst.txt -r--r--r-- 1 cats archive 1230 Mar 2 1998 stars.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : III/44 Atlas of Stellar Spectra (Johnson 1977-1978) ================================================================================ An Atlas of Stellar Spectra Johnson H.L. <Rev. Mex. Astron. Astrof. 2, 71 (1977)> =1977RMxAA...2...71J <Rev. Mex. Astron. Astrof. 4, 3 (1978)> =1978RMxAA...4....3J ================================================================================ ADC_Keywords: Spectrophotometry Description: There are exactly 8192 spectral elements (points) in each spectrum, regularly spaced in terms of frequency. The first point corresponds to spectral frequency 0, while point number 8193 (not included) corresponds to the laser frequency. The 632.8nm laser frequency was doubled, producing an effective laser wavelength of about 316.4nm. Tentatively, it may be assumed that the exact laser wavelength is 316.43nm. The spectra have been normalized so that the bluest stars are approximately level from 480 to 1000nm. The spectra are linear in intensity with zero intensity at tabulated zero. It was not possible to make satisfactory atmospheric extinction corrections throughout all of the atmospheric bands; at places where corrections could not be made, the spectra were set (exactly) to zero. Some of these spectra have been published already (H.L. Johnson, Rev. Mex. Astron. Astrof. 2, 71, 1977); the remainder will be published soon (Rev. Mex. Astron. Astrofis., 4, 3). These published spectral plots contain in graphical form the information needed to evaluate the signal-to-noise ratios of the spectra on this tape. (From Harold L. Johnson, Dec. 13, 1977)