%0 Journal Article
%T CCD-based observations of PG 0856+121 and a theoretical analysis of its oscillation modes
%A A. Ulla
%A M. R. Zapatero Osorio
%A F. Perez Hernandez
%A J. MacDonald
%J Physics
%D 2001
%I arXiv
%R 10.1051/0004-6361:20010181
%X BVRI CCD-based and near-IR (J) imaging, together with unfiltered photometry of the hot subdwarf B star PG 0856+121 are reported. Two close, faint, red, point-like sources are resolved. They account for the previously reported IR excess observed in this hot subdwarf. In addition, the new unfiltered differential photometry of PG 0856+121 confirms its previously reported pulsational nature. A comparison with the oscillation modes of stellar models suggests the possible presence of g modes.
%U http://arxiv.org/abs/astro-ph/0102142v1