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IUE observations of cool stars - Alpha Aurigae, HR1099, Lambda Andromedae, and Epsilon EridaniInitial IUE observations of four cool stars are reported. Observed fluxes and surface fluxes are given for several UV emission lines in the spectral range 1175-2000 A, obtained at low and high dispersion with the short-wavelength spectrograph and camera. These lines are formed in the outer atmospheres of these stars, in regions presumably analogous to the solar chromosphere and transition region. The surface fluxes in the lines increase along the sequence: quiet sun, Epsilon Eri, Lambda And, Alpha Aur, and HR1099. The 2.8-d RS CVn-type binary HR1099, observed on 1 March 1978 near the end of a major flaring episode, has line surface fluxes roughly 100 times that of the quiet sun, similar to those seen in solar flares. Line profiles and flux ratios in multiplets for Capella are presented, and comments given on the opacity of the lines and on a tendency of line width to increase with temperature of formation.
Document ID
19780069947
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Linsky, J. L.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Ayres, T. R.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Basri, G. S.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Morrison, N. D.
(Joint Institute for Laboratory Astrophysics Boulder, Colo., United States)
Boggess, A.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Schiffer, F. H., III
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Holm, A.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Cassatella, A.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Heck, A.
(ESA Satellite Tracking Station, Madrid, Spain)
Macchetto, F.
(ESA, European Space Research and Technology Centre Noordwijk, Netherlands)
Date Acquired
September 3, 2013
Publication Date
October 5, 1978
Publication Information
Publication: Nature
Volume: 275
Subject Category
Astronomy
Report/Patent Number
PB-290031
Accession Number
78A53856
Distribution Limits
Public
Copyright
Other

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