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UBC Theses and Dissertations

Line intensities and special types in B type stars Maunsell, Charles Dudley


Photometric measures of absorption line intensities in the spectra of forty-five B stars are given. The plates were taken and measurements made at the Dominion Astrophysical Observatory. Graphs have been prepared showing the intensities plotted against the Henry Draper subtype of the star for the stronger lines. Using these intensity measurements, those published by E. G. Williams, and unpublished measures by R. II. Petrie, criteria for determining spectral type from ratios of the intensities of the stronger lines are suggested. Also, from the variation of Balmer line intensity with luminosity, a method of determining absolute magnitudes is suggested. Spectral types and luminosities as determined from these criteria are given for 133 B type stars for which photometric measures of line intensity are available.

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