Ultraviolet and optical spectroscopy of the R Aquarii symmetrical jet

Details Ultraviolet and optical spectroscopy of the R Aquarii symmetrical jet Ultraviolet and optical spectroscopy of the R Aquarii symmetrical jet

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..227h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 10, 1991, p. 227-234.

Astronomy and Astrophysics

Astronomy

24

H Ii Regions, Iue, Radio Jets (Astronomy), Symbiotic Stars, Ultraviolet Spectroscopy, Visual Photometry, Charge Coupled Devices, Mira Variables, Stellar Activity

Scientific paper

The first ultraviolet spectrum of the southwest (SW) component of the symmetrical jet in the R Aquarii binary system has been obtained in the range 1200-2000 A with the IUE. These results are compared to more encompassing spectra of the central H II region taken at the same time and also similar spectra of the northeast (NE) jet component obtained six months earlier. Moreover, optical spectra of both the NE and SW jet components in the range 3400-9800 A were obtained within about 6 months and about 1 month, respectively, of the ultraviolet spectra. These highly complementary observations argue that excitation of the symmetrical jet may be due to shock excitation as the jet components overtake and impact the previously ionized material associated with the expanding inner nebulosity. The problems with this shock model as well as problems with competing photoionization models are discussed. It is suggested that the jet components were ejected less than 90 years ago.

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