CCD-based observations of PG 0856+121 and a theoretical analysis of its oscillation modes

Details CCD-based observations of PG 0856+121 and a theoretical analysis of its oscillation modes CCD-based observations of PG 0856+121 and a theoretical analysis of its oscillation modes

2001-02-08

arxiv.org/abs/astro-ph/0102142v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A. Seven pages, four figures included

Scientific paper

10.1051/0004-6361:20010181

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.

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