Query : 2009A&A...495..931G

2009A&A...495..931G - Astronomy and Astrophysics, volume 495, 931-936 (2009/3-1)

The spectroscopic orbit and the geometry of R Aquarii.


Abstract (from CDS):

object{R Aqr} is one of the closest symbiotic binaries and the only D-type system with radial velocity data suitable for orbital parameter 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 exhibited by R Aqr. We reanalyze and revise the velocity data compiled by McIntosh & Rustan (2007AJ....134.2113M) complemented by additional velocities. We find an eccentric orbit (e=0.25) with a period 43.6yr. 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.

Abstract Copyright:

Journal keyword(s): stars: binaries: symbiotic - stars: binaries: spectroscopic - stars: individual: R Aquarii - stars: fundamental parameters

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1513 0
2 V* R Aqr Sy* 23 43 49.4634303216 -15 17 04.176349872   8.823 7.683 9.37   M6.5-8.5e 777 0

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