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- W2115827619 abstract "We report high-resolution spectroscopic observa- tions of the NLTE H core in 28 DA white dwarfs. From a comparison with theoretically broadened NLTE models pro- jected rotation velocities can be determined. The majority of objects are found to be compatible with zero or very small rota- tion with typical upper limits for v sin i of 15 km/s, correspond- ing to periods of hours or longer. The implications for the loss of angular momentum during the evolution of the progenitors is discussed. Three new magnetic white dwarfs are detected with very small tangential fields in the range of 30 to 50 kG. In two more magnetic objects known before we found field strengths significantly larger than the mean longitudinal fields determined from the circular polarization. Very puzzling is the result for three ZZ Ceti stars in the sample, which all seem to have pro- jected rotational velocities between 30 and 45 km/s, in conflict with asteroseismological results." @default.
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- W2115827619 date "1998-01-01" @default.
- W2115827619 modified "2023-10-17" @default.
- W2115827619 title "Search for rotation in white dwarfs" @default.
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