A new method of determining the inclination angle in interacting binaries

Details A new method of determining the inclination angle in interacting binaries A new method of determining the inclination angle in interacting binaries

1998-03-25

arxiv.org/abs/astro-ph/9803290v1

Astronomy and Astrophysics

Astrophysics

8 pages Latex, 15 figures, to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.01618.x

We describe a method of determining the system parameters in non-eclipsing interacting binaries. We find that the extent to which an observer sees the shape of the Roche-lobe of the secondary star governs the amount of distortion of the absorption line profiles. The width and degree of asymmetry of the phase-resolved absorption line profiles show a characteristic shape, which depends primarily on the binary inclination and gravity darkening exponent. We show that, in principle, by obtaining high spectral and time resolution spectra of quiescent cataclysmic variables or low mass X-ray binaries in which the mass-losing star is visible, fitting the shape of absorption line profiles will allow one to determine not only the mass function of the binary, but also the binary inclination and hence the mass of the binary components.

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