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Issue A&A
Volume 369, Number 3, April III 2001
Page(s) 986 - 992
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010181



A&A 369, 986-992 (2001)
DOI: 10.1051/0004-6361:20010181

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

A. Ulla1, M. R. Zapatero Osorio2, 3, F. Pérez Hernández2, 4 and J. MacDonald5

1  Universidade de Vigo, Departamento de Física Aplicada, Área de Física da Terra, Astronomía e Astrofísica, Facultade de Ciencias, Campus Lagoas-Marcosende, 36200 Vigo, Spain
2  Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain
3  CALTECH, MS 150-21, Pasadena, CA 91125, USA
4  Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain
5  Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA

(Received 5 July 2000 / Accepted 29 January 2001 )

Abstract
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.


Key words: binaries: close -- stars: individual: PG 0856+121 -- stars: oscillations -- subdwarfs

Offprint request: A. Ulla, ulla@uvigo.es

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© ESO 2001


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