Aims: 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 exhibited by
Methods: We reanalyze and revise the velocity data compiled by McIntosh & Rustan complemented by additional velocities.
Results: 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 increase in extinction towards the Mira variable in 1974-1981 occurred 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.
Astronomy and Astrophysics
- Pub Date:
- March 2009
- stars: binaries: symbiotic;
- stars: binaries: spectroscopic;
- stars: individual: R Aquarii;
- stars: fundamental parameters;
- 7 pages, 4 figures, accepted for publication in A&