Variability and nature of the binary in the Red Rectangle Nebula

Details Variability and nature of the binary in the Red Rectangle Nebula Variability and nature of the binary in the Red Rectangle Nebula

1996-09-06

arxiv.org/abs/astro-ph/9609058v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, A&A Letters accepted

Scientific paper

We present new observations of the central binary inside the Red Rectangle nebula. The detection of zinc in the optical spectrum confirms that the peculiar photospheric abundances are due to accretion of circumstellar gas. Grey brightness variations with the orbital period are observed. They are interpreted as being due to the variation of the scattering angle with orbital phase. The small orbital separation of the system is not compatible with previous normal evolution of the primary on the AGB. We point out the similarity of the orbital history of this and other similar systems with those of some close Barium stars and suggest that the nonzero eccentricity of the orbit is the result of tidal interaction with the circumbinary disk.

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