Astronomical Data Center

ADCADC/CDS Standard Document for Catalog:
/catalogs/2/2025/

The following is the "ReadMe" document that describes this ADC catalog.

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You can access the files described here from the anonymous FTP directory:
   ftp://adc.astro.umd.edu/pub/adc/archives/catalogs/2/2025/. 

II/25       Photometry Orange-Red Ca I Triplet in Late-Type Stars (Peat 1964)
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Photometry of Orange-Red Ca I Triplet in Late-Type Stars. Table I
    Peat D.W.
    <Mon. Not. R. Astron. Soc., 128, 475 (1964)>
    =1964MNRAS.128..475P
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ADC_Keywords: Stars, late-type ; Photometry, calcium triplet ; 
              Photometry, H-alpha

Description:
  Calcium absorption lines were measured using narrow-band photometry on 296
  high and low velocity G8-K5 stars of all luminosity classes. Because the 
  blue-violet region of the stellar spectra is too crowded for narrow-band 
  photometry, this investigation of abundance involved measurements of the 
  orange-red Ca I triplet 4(3)P-5(3)S, with wavelengths 6102.7, 6122.2 and 
  6162.2 A. "Calcium triplet ratio" is defined as "the measured light intensity
  ratios, comparison/central regions, calibrated in terms of a standard lamp 
  as described in previous Cambridge papers." (Peat, 1964) The data file 
  includes CDS file identification, HD number, spectral type, luminosity class,
  indication of high velocity, (B-V) color index to two decimal places, Mg b 
  ratio to two decimal places, H-alpha ratio to three decimal places, Calcium 
  triplet ratio to three decimal places, and a running number. Decimal points
  have been omitted.

File Summary:
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 FileName       Lrecl  Records   Explanations
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ReadMe             80        .   This file
data.dat           88      296   Photometry of the orange-red Ca I triplet
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Byte-by-byte Description of file: data.dat
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   Bytes Format  Units   Label    Explanations
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   1-  n  In     ---     ---      ---
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References:
  Peat D.W. 1964, Mon. Not. R. Astron. Soc., 128, 475.
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(End)                                  Julie Anne Watko [SSDOO/ADC]  03-MAY-1996
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