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Magnetic fields are present in roughly 10% of white dwarfs. These fieldsaffect the structure and evolution of such stars, and may provide clues abouttheir earlier evolution history. Particularly important for statistical studiesis the collection of high-precision spectropolarimetric observations of (1)complete magnitude-limited samples and (2) complete volume-limited samples ofwhite dwarfs. In the course of one of our surveys we have discovered previouslyunknown kG-level magnetic fields on two nearby white dwarfs, WD1105-340 andWD2150+591. Both stars are brighter than m_V = 15. WD2150+591 is within the20-pc volume around the Sun, while WD1105-340 is just beyond 25 pc in distance.These discoveries increase the small sample of such weak-field white dwarfsfrom 21 to 23 stars. Our data appear consistent with roughly dipolar fieldtopology, but it also appears that the surface field structure may be morecomplex on the older star than on the younger one, a result similar to onefound earlier in our study of the weak-field stars WD2034+372 and WD2359-434.This encourages further efforts to uncover a clear link between magneticmorphology and stellar evolution.

Discovery of kilogauss magnetic fields on the nearby white dwarfs WD1105-340 and WD2150+591