A rotating white dwarf shows different compositions on its opposite faces

Ilaria Caiazzo, Kevin B. Burdge, Pier-Emmanuel Tremblay, James Fuller, Lilia Ferrario, B. T. Gänsicke, J. J. Hermes, Jeremy Heyl, A. Kawka, S. R. Kulkarni, T. R. Marsh, P. Mróz, Thomas A. Prince, Harvey B. Richer, Antonio C. Rodriguez, Jan van Roestel, Zachary P. Vanderbosch, S. Vennes, D. T. Wickramasinghe, V. S. Dhillon, S. P. Littlefair, James Munday, Ingrid Pelisoli, D. A. Perley, Eric C. Bellm, E. Breedt, Alex Brown, Richard Dekany, A. J. Drake, M. Dyer, M. J. Graham, Matthew Green, Russ R. Laher, P. Kerry, S. G. Parsons, Reed Riddle, B. Rusholme, D. I. Sahman