The [N II] Kinematics of R Aquarii

Details The [N II] Kinematics of R Aquarii The [N II] Kinematics of R Aquarii

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...522..297h&link_type=abstract

The Astrophysical Journal, Volume 522, Issue 1, pp. 297-304.

Astronomy and Astrophysics

Astronomy

9

Stars: Circumstellar Matter, Ism: Jets And Outflows, Stars: Individual: Constellation Name: R Aquarii, Techniques: Interferometric

Scientific paper

We report a kinematic study of the symbiotic star system R Aqr derived from [N II] lambda6584 emission observations with a Fabry-Perot imaging spectrometer. The [N II] spatial structure of the R Aqr jet, first observed circa 1977, and surrounding hourglass-shaped nebulosity, due to an explosion ~660 yr ago, are derived from 41 velocity planes spaced at ~12 km s^-1 intervals. Fabry-Perot imagery shows that the elliptical nebulosity making up the waist of the hourglass shell is consistent with a circular ring expanding radially at 55 km s^-1 as seen at an inclination angle i~70^deg. With respect to the position of R Aqr, at optical and radio wavelengths the jet is made up of a northeast component and a less intense, more amorphous southwest component. The [N II] Fabry-Perot data cube demonstrates that the two jet components possess quite different intensity-velocity structures which represent collimated flow in opposite directions. We offer an idealized schematic model for the R Aqr jet motion which results in a small-scale helical structure forming around a larger scale helical path. The implications of such a jet model are discussed. We present a movie showing a side-by-side comparison of the spatial structure of the model and the data as a function of the 41 velocity planes.

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