Temporal Variations and Spectroscopy of the Core of R Aquarii

Details Temporal Variations and Spectroscopy of the Core of R Aquarii Temporal Variations and Spectroscopy of the Core of R Aquarii

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.8410h&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #84.10; Bulletin of the American Astronomical Society, Vol. 25, p.1424

Astronomy and Astrophysics

Astronomy

Scientific paper

The inner region of the symbiotic system R Aquarii was imaged with the Faint Object Camera on the Hubble Space Telescope (HST) in order to determine the source and structure of the highly collimated bipolar jet near the central Mira variable. We present images which cover both a wide wavelength and temporal range taken through narrow and medium band filters F501N, F253M and F190M containing the [O{\small III}] lambda 5007, [O{\small II}] lambda 2470, C{\small III}] lambda 1909 emission lines taken approximately a pulsation period apart on October 1991 and December 1992 with a single image taken just after minimum in October 1993. The jet can be clearly detected in the UV down to at least 15 AU of the Mira, placing its source well within the expected binary orbit. Those features within 100 AU in the NE jet vary in phase with the Mira while those outside this region change the positions of emission supporting the idea that the Mira wind influences the speed or direction of the jet. In addition to the direct images, objective prism images taken in October 1991 and December 1992 allow us to track which lines are responsible for the majority of the emission in each of the features from one epoch to the next. The line ratios derived from the images and spectra are consistent with a shock being driven through material left over from an earlier episode of mass ejection.

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