Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...298..849d&link_type=abstract
Astronomy and Astrophysics, v.298, p.849
Astronomy and Astrophysics
Astrophysics
19
Stars: Cataclysmic Variables, Stars: Individual (Bg Cmi (3A0729+103)), X-Rays: Binaries
Scientific paper
The photometric and spectroscopic analysis presented here has revealed new observational features in the Intermediate Polar BG CMi. We have found a strong variability of the dominant light pulsations, rotational (913s) and orbital (3.23hr), on a timescale of years. Variations in the amplitude of the spin pulsation with epoch generally appear to be anti-correlated with that of the orbital modulation with the former decreasing while the latter increases. We do not find stable periodic signals at other frequencies as well as no indication of periodicity at the 847s X-ray period. UV and optical orbital continuum modulations reveal two components at different temperatures. The hot contribution is identified with the bulge (the heated face of the hot-spot) and the cool one with the hot-spot itself eclipsed by the secondary star. Orbital phase resolved spectroscopy reveals a rotational disturbance in the HeII emission line, indicating a partial eclipse of circulating material around the white dwarf, possibly in the form of a ring. From the orbital motion of the white dwarf, we also infer that BG CMi is a moderate inclination system (i~55^o^-75^o^).
Augusteijn Th.
Bonnet-Bidaud Jean-Marc
de Martino Domitilla
Garlick Mark A.
Mouchet Martine
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