The Spectrum of γ Pegasi.

Abstract

view Abstract Citations (14) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Spectrum of γ Pegasi. Underhill, Anne B. Abstract Two coudé plates of -y Pegasi have been measured for wave length, and some new lines were found. About 70 per cent of the 877 lines measured between X 3965 and X 4921 have been identified. The results show generally that the spectrum of any element of reasonably high abundance on the earth may be found if its excitation potential is around 20-25 volts. Potassium has not been found, in spite of the fact that it is abundant on the earth, and the lines of the Ku spectrum have very favorable wave length and excitation potential for appearance in ~y Pegasi. Small displacements, such as are qualitatively expected on the basis of Stark effect, are found for the He i lines. A quantitative comparison is made between theory and observation, and it is shown that the observed displacements of the diffuse-series lines are more nearly in agreement with those calculated by M. K. Krogdah.1 on the basis of collisional broadening than with those given by the theory of Stark effect from constant fields. Some forbidden He I lines of the 2'P - m'P series are tentatively identified, and a possible explana- tion of a small luminosity effect at X 4026 between dwarf and intermediate B-type stars is proffered Publication: The Astrophysical Journal Pub Date: May 1948 DOI: 10.1086/145017 Bibcode: 1948ApJ...107..337U full text sources ADS |