VV Puppis in a low state: secondary-star irradiation or stellar activity? E. Mason, S. B. Howell, T. Barman, P. Szkody and D. Wickramasinghe A&A, 490 1 (2008) 279-286 Published online: 25 August 2008 DOI: 10.1051/0004-6361:20078804