Bibcode
Hinojosa, R.; Vogt, N.; Colque, Juan Pablo
Referencia bibliográfica
VI Reunion Anual Sociedad Chilena de Astronomia (SOCHIAS), held in Valparaiso, Chile, 7 - 9 November 2007, p. 36
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2007
Número de citas
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Número de citas referidas
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Descripción
We present preliminary results of differential photometric observations
of Abell 65, HZ 9, GD 1401 and BPM 46460, obtained between September and
December 2006 with the 42 cm telescope of the Cerro Armazones
Observatory which belongs to the Universidad Catolica del Norte,
Antofagasta. All four stars are close red dwarf/white dwarf binaries
which could have formed be recent common envelope events. In two of the
four cases we detected (or confirmed) significant variability. In one of
them, the central star of a planetary nebula Abell 65, we confirmed the
rather strong photometric variability with a period very near to 24
hours (Bond and Livio, 1990). In the white dwarf binary HZ9 we
detected, for the first time, photometric variations with a period near
0.58 days which corresponds to the known orbital period (Lanning and
Pesch, 1981; Stauffer, 1987). The amplitude of this variation is 0.08
mag, it probably refers to reflection of the white dwarf radiation on
the surface of the red companion. - These observations are part of a
larger on-going project which pretends to identify and to study
pre-cataclysmic binaries by means of photometric and spectroscopic
methods and to improve, this way, the hitherto poor statistics on the
properties of these interesting stars.