Abstract
view Abstract Citations (32) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Non--Local Thermodynamic Equilibrium Line Profiles, Rotation, and Magnetic Fields in Seven DA White Dwarfs Koester, D. ; Herrero, A. Abstract Non-LTE calculations of H-alpha line profiles are presented and applied to derive rotational velocities from high-resolution spectra of DA white dwarfs. This paper extends recent work by Pilachowski and Milkey (1984, 1987) to southern hemisphere objects and confirms their findings that all white dwarfs seem to be slow rotators. Of the seven objects in this study only one has v sin 1 = 30 + or - 20 km/s, only marginally different from 0. The remaining objects are all fitted by v sin 1 = 0, and upper limits of 20-40 km/s were obtained. Upper limits on magnetic fields of 25,000 G were determined for all objects from the absence of Zeeman splitting. Publication: The Astrophysical Journal Pub Date: September 1988 DOI: 10.1086/166700 Bibcode: 1988ApJ...332..910K Keywords: Balmer Series; Line Spectra; Stellar Magnetic Fields; Stellar Rotation; Thermodynamic Equilibrium; White Dwarf Stars; Angular Velocity; High Resolution; Southern Hemisphere; Zeeman Effect; Astrophysics; LINE PROFILES; STARS: MAGNETIC; STARS: ROTATION; STARS: WHITE DWARFS full text sources ADS | data products SIMBAD (8)
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