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Ultraviolet Observations of the R Aquarii Jet

Published online by Cambridge University Press:  30 March 2016

A.G. Michalitsianos  and
M. Kafatos
A.G. Michalitsianos
Affiliation:
NASA Goddard Space Flight Center, Greeneblt, MD. 20771 USA
M. Kafatos
Affiliation:
George Mason University, Department of Physics, Fairfax, Virginia 22030 USA

Extract

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Observations of the recently discovered jet feature in the symbiotic variable R Aquarii (M7e+pec) were obtained with the International Ultraviolet Explorer (IUE). A comparison of low dispersion UV-spectra reveals important differences between the central ionized source and the jet feature. The UV-continuum flux Fλ between 1200-2000A that rises with decreasing wavelength in the jet feature, essentially is independent with wavelength in the central compact nebula. The prominent emission lines of Si III] λ1892A and Si II λ1817A, evident in the central star, are virtually absent in the jet. The carbon lines of C IV, C III] and C II also suggest the general excitation of the jet is comparatively lower than the central star. This is further indicated by enhanced S II λ1250, 1295A and C II λ1335A emission in the feature. We speculate that material that is ejected from the symbiotic system cools through free-free and nebular recombination emission.

Type
Joint Commission Meetings
Information
Highlights of Astronomy , Volume 6: Highlights of Astronomy. As presented at the XVIIIth General Assembly of the IAU, 1982 , 1983 , pp. 637 - 639
Copyright
Copyright © Reidel 1983

References

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