7 papers
The CNO problem in magnetic cataclysmic variables
Jean-Marc Bonnet-Bidaud, Martine Mouchet
Some magnetic CVs like BY Cam are characterized by unusual CNO line ratios compared to other polars and non-solar abundances have been suggested to explain this anomaly. We present…
A white dwarf with a low magnetic field in the IP RXJ0028.8+5917/V709Cas
J. M. Bonnet-Bidaud, M. Mouchet, D. de Martino +2
We report the first detailed spectroscopic observations of the recently identified intermediate polar RXJ0028.8+5917/V709 Cas. We discovered that the system shows significant EW ~…
Search for companions around Sirius
Jean-Marc Bonnet-Bidaud, Francois Colas, Jean Lecacheux
Since the discovery of Sirius-B about 130 yr ago, there have been several claims of a possible second companion around the brightest star Sirius-A. Such a companion could, in parti…
BeppoSAX observations of AM Herculis in intermediate and high states
G. Matt, D. de Martino, B. T. Gaensicke +5
Temporal and spectral analyses from BeppoSAX observations of AM Her performed during both an intermediate and a high state are presented and discussed. Optical observations taken a…
The X-ray emission of the polar BL Hydri
G. Matt, R. Barcaroli, T. Belloni +8
We report on the analysis of the ASCA and BeppoSAX X-ray observations of the polar system BL Hyi. Emission from both poles is apparent in both observations; the emission from the s…
The identification of the transient X-ray pulsar Cepheus X-4 with a Be/X-ray binary
Jean-Marc Bonnet-Bidaud, Martine Mouchet
We present long slit spectral (375-725 nm) observations of the proposed identification of the transient 66s X-ray pulsar Cep X-4=GS2138+56. Spectra show features typical of Be/X-ra…