The spectroscopic orbit and the geometry of R Aqr

Abstract

R Aqr is one of the closest symbiotic binaries and the only D-type system with radial velocity data suitable for orbital parameters estimation. The aims of our study are to derive a reliable spectroscopic orbit of the Mira component, and to establish connections between the orbital motion and other phenomena shown by R Aqr. We reanalize velocity data recently published by McIntosh & Rustan complemented by additional velocities. We find an eccentric orbit (e=0.25) with a period 43.6 yr. This solution is in agreement with a resolved VLA observation of this system. We demonstrate that the last 1974-1981 increase of extinction towards the Mira occured during its superior spectroscopic conjunction, and can be due to obscuration by a neutral material in the accreting stream. We also show that jet ejection is not connected with the orbital position.

arXiv comment7 pages, 4 figures, accepted for publication in A&A

References in corpus (8)

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• Outer jet X-ray and radio emission in R Aquarii: 1999.8 to 2004.0
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• Discovery of Rapid Hard X-ray Variability and New Jet Activity in the Symbiotic Binary R Aqr
• Discovery of hydroxyl and water masers in R Aquarii and H1-36 Arae
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• A Review of The O--C Method and Period Change

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