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A GRAVITATIONAL REDSHIFT DETERMINATION OF THE MEAN MASS OF WHITE DWARFS: DBA AND DB STARS
We measure apparent velocities (vapp) of absorption lines for 36 white dwarfs (WDs) with helium-dominated atmospheresā16 DBAs and 20 DBsāusing optical spectra taken for the European Southern Observatory SN Ia progenitor survey. We find a difference of 6.9 Ā± 6.9 km sā1 in the average apparent velocity of the HĪ± ā¦