/ftp/cats/III/29



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III/29             Catalog of Hgamma measures               (Petrie+ 1973)
The following files can be converted to FITS (extension .fit or fit.gz)
	catalog.dat remarks.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=III/29
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Beginning of ReadMe : III/29 Catalog of Hgamma measures (Petrie+ 1973) ================================================================================ A catalogue of Hgamma measures Petrie R.M., Crampton D., Leir A. Younger F. <Publ. Dom. Astrophys. Obs. XIV, 151 (1973)> =1973PDAO...14..151P =2016yCat.3029....0P ================================================================================ ADC_Keywords: Equivalent widths ; Photometry, H-gamma Abstract: A catalogue of equivalent widths of Hgamma measured by R.M. Petrie in the spectra of 1171 stars is presented. The catalogue represents a compilation of all the published and unpublished values available to us. It is shown that no systematic differences exist between the equivalent widths by Petrie and those currently being derived at the Dominion Astrophysical Observatory. Description: The catalog is a compilation of equivalent widths of H-gamma for early-type stars, not only from published material but also from the numerous card files kept by R.M. Petrie. The luminosities of early-type stars through the measurement of the equivalent width of H-gamma are relatively precise, although the early work was hampered by systematic errors in the absolute magnitude calibrations. In a number of cases, the values of the equivalent width for a given star differ slightly from publication to publication. There are three possible reasons for this: 1) The later publications may include measurements of additional spectra; 2) in some cases the values were included in the average; 3) some initial measures had not included the extremities of the very extensive wings of H-gamma in the spectra of A stars.