First spatial resolution of the stellar components of the interacting binary CH Cygni

Details First spatial resolution of the stellar components of the interacting binary CH Cygni First spatial resolution of the stellar components of the interacting binary CH Cygni

2009-10-27

arxiv.org/abs/0910.5176v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

5 pages, 4 figures, submitted to MNRAS

Scientific paper

We report the first resolved bispectrum speckle interferometry of the symbiotic binary CH Cyg. The measured component separation, $\rho=42 \pm 2$ mas, is consistent with the one derived from the known spectroscopic orbit and distance. In particular, our result implies a total mass of the binary of $M_{\rm t}=M_{\rm g}+M_{\rm wd}=3.7^{+3.5}_{-1.7} \rm M_{\sun}$, which is in good agreement with the value $M_{\rm t}=2.7^{+1.2}_{-0.6} \rm M_{\sun}$ derived from the spectroscopic orbit solution for the red giant and evolutionary contraints. We also show that the radio jets and the bipolar outflow are not orthogonal to the orbital plane of the binary system.

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