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

Bibcode
2001A&A...369..986U
DOI
10.1051/0004-6361:20010181
Ulla, A.; Zapatero Osorio, M. R.; Pérez Hernández, F.; MacDonald, J.
Bibliographical reference

Astronomy and Astrophysics, v.369, p.986-992 (2001)

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4
2001
Journal
Astronomy and Astrophysics
Number of authors
4
IAC number of authors
2
Citations
7
Refereed citations
6
Description
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 presence of g modes. Based on observations made with the IAC80 Telescope operated on the island of Tenerife by the Instituto de Astrofísica de Canarias in the Spanish Observatorio del Teide.
Type
Refereed

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