Electron scattering in the atmospheres of hot DA white dwarfs

Abstract

view Abstract Citations (1) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Electron scattering in the atmospheres of hot DA white dwarfs Wesemael, F. Abstract High-frequency emission from the photosphere of hot, hydrogen-rich white dwarfs is reexamined, taking into account results of Bohm and Kapranidis (1980), which state that electron scattering has a strong influence on the energy distribution at EUV wavelengths. Calculations made with and without electron scattering indicate that scattering does not have significant influence for frequencies below 2 x 10 to the 16th Hz. Emission is enhanced at high frequencies without scattering due to the lower opacity in the atmosphere which implies that continuum formation occurs much deeper in the atmosphere in hotter layers. Results indicate that electron scattering dominates the source function over a long range of depths, and support Shipman's (1979) explanation that the EUV flux arises from thermal emission from hot, deep-lying photospheric layers. Publication: The Astrophysical Journal Pub Date: July 1981 DOI: 10.1086/159069 Bibcode: 1981ApJ...247..590W Keywords: Electron Scattering; Hot Stars; Stellar Atmospheres; Stellar Radiation; White Dwarf Stars; Atmospheric Models; Extreme Ultraviolet Radiation; Optical Thickness; Astrophysics full text sources ADS |