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An Unidentified Emission Line at 7090 Å

Published online by Cambridge University Press:  25 April 2016

David A. Allen
David A. Allen*
Affiliation:
Anglo-Australian Observatory, Epping
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Extract

Symbiotic stars are at the same time perplexing and rewarding to study. Their spectra contain great numbers of emission lines due to atoms in a range of ionization states from neutral to coronal. The continua are weak and usually unobtrusive: the strongest lines may have equivalent widths of thousands of Angstroms. But the crowding of weak lines complicates their measurement and, often, their identification. Many symbiotic stars probably emit weak lines which currently defy identification, but which cannot be distinguished from their neighbours. It is, however, rather rare to find a strong unidentified emission line.

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Contributions
Information
Publications of the Astronomical Society of Australia , Volume 3 , Issue 1 , September 1976 , pp. 78 - 79
Copyright
Copyright © Astronomical Society of Australia 1976

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