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• W2077775781 abstract "view Abstract Citations (9) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the Doublet Ratio of Interstellar H and K and the Absolute Magnitudes of Wolf-Rayet Stars. Sanford, Roscoe F. ; Wilson, O. C. Abstract Observations-The total absorptions of the interstellar Ca ii lines, H and K, have been measured in 400 and B stars with weak H and in i8 Woif-Rayet stars (Table i). The difficulty so often encountered in measuring the total absorption of H in the pres- ence of strong He in absorption has therefore been largely obviated, and it is hoped that these measures are an improvement upon earlier ones. Ratio of K to H-K/H appears to be approximately 2 for very weak lines and to de- crease, on the average, as lines of greater strength are considered, reaching 1.56 for H 0.4 A, with little apparent tendency to diminish thereafter. See Figures i and 2. Ratios D2/K and Di/H.-Twenty-f our stars in Table i provide measures of the total absorptions of the interstellar D2 and Di of Na I. The mean D2/K and Di/H derived therefrom are 1.63 and 2.18, respectively, which closely check earlier results, i.6 and the tentative value 2.1, respectively. Absolute magnitudes of Woif-Rayet stars-The curve which relates distance with K- line intensity has been used to derive the distances of the i8 Woif-Rayet stars from which mean visual absolute magnitudes for 6 stars of the carbon sequence and 12 of the nitrogen sequence have been derived. They are -2.8 and -2.1, respectively. Masses of the Woif-Rayet stars-Plausible values of temperature, together with our derived absolute magnitudes and what appears to be a reasonable allowance for the contribution of bright bands to the apparent magnitudes, give masses approximately thirty times that of the sun. The assumptions and guesses involved make such values highly speculative, even though the mass-luminosity relation itself is unqualifiably ac- cepted Publication: The Astrophysical Journal Pub Date: September 1939 DOI: 10.1086/144101 Bibcode: 1939ApJ....90..235S full text sources ADS | Related Materials (1) Reprint: 1939CMWCI.613....1S" @default.
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• W2077775781 date "1939-09-01" @default.
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• W2077775781 title "On the Doublet Ratio of Interstellar H and K and the Absolute Magnitudes of Wolf-Rayet Stars." @default.
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