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Evidence for Stellar Chromospheres Presented by Ultraviolet Observations of the Sun and Stars

Published online by Cambridge University Press:  06 September 2019

Lowell Doherty
Lowell Doherty*
Affiliation:
Space Astronomy Laboratory, Washburn Observatory, University of Wisconsin

Extract

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I would like to describe observations of emission lines in stellar sources, in the ultraviolet region of the spectrum not accessible to ground observation. As we have heard, the interpretation of emission lines may involve both geometrical and temperature effects, so that the occurrence of emission lines does not constitute prima facie evidence for chromospheres. On the other hand, we have not yet, at this conference, formulated a definition of a chromosphere that excludes any particular category of stellar emission-line objects.

In principle, information on chromospheric structure is also contained in the continuum. However, the measurement of accurate spectral energy distributions depends on the very difficult process of ultraviolet photometric calibration. This work is continuing both at Goddard and the University of Wisconsin.

Type
Part II: Observational Evidence for Stellar Chromospheres
Information
International Astronomical Union Colloquium , Volume 19: Stellar Chromospheres , February 1973 , pp. 99 - 124
Copyright
Copyright © Nasa 1972

References

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