Mass loss, levitation, accretion, and the sharp-lined features in hot white dwarfs

Abstract

view Abstract Citations (84) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Mass loss, levitation, accretion and the sharp-lined features in hot white dwarfs. Bruhweiler, F. C. ; Kondo, Y. Abstract A study has been conducted of eight white dwarfs, including seven DA and one He-rich types. The study is based on high-resolution observations conducted with the aid of the International Ultraviolet Explorer. Four of the dwarfs show features related to heavy elements which are not interstellar in origin. It is tentatively suggested that, at least in the hottest low-gravity DA white dwarfs, the observed narrow-lined features are formed in expanding halos or winds associated with the white dwarfs. Theoretically, stable white dwarf halos should actually be coronae with temperatures in excess of 1,000,000 K. However, the observed narrow-lined features do not suggest such high temperatures. The observed radial velocities suggest weak stellar winds in two hot white dwarfs, namely, G191-B2B and 2111+49. It is tentatively proposed that radiative levitation can explain the appearance of the observed metallic lines in the hot DA white dwarfs. Publication: The Astrophysical Journal Pub Date: June 1983 DOI: 10.1086/161073 Bibcode: 1983ApJ...269..657B Keywords: Hot Stars; Stellar Mass Accretion; Stellar Mass Ejection; Stellar Spectra; Ultraviolet Astronomy; White Dwarf Stars; Helium; Iue; Line Spectra; Silicon; Astrophysics full text sources ADS | data products SIMBAD (8) MAST (1) INES (1)