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Upper limits on extreme ultraviolet radiation from nearby main sequence and subgiant starsFlux upper limits for 44-800 A radiation were measured in a sample of nearby main sequence stars and one subgiant star with the aid of the Apollo-Soyuz grazing incidence telescope. Comparisons of emission measure upper limits with three different methods for predicting coronal properties cannot yet determine which, if any, are valid. Data for Alpha Centauri A and B are consistent with recent HEAO-1 soft X-ray measurements which suggest that the surface flux of coronal emission from the Alpha Cen system is comparable to that of the 'normal' sun.
Document ID
19790041476
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ayres, T. R.
(Joint Institute for Laboratory Astrophysics Boulder, Colo., United States)
Linsky, J. L.
(Joint Institute for Laboratory Astrophysics; National Bureau of Standards, Quantum Physics Div., Boulder Colo., United States)
Margon, B.
(California, University Los Angeles, Calif., United States)
Bowyer, S.
(California, University Berkeley, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
November 1, 1978
Publication Information
Publication: Astronomy and Astrophysics
Volume: 70
Issue: 3
Subject Category
Astronomy
Accession Number
79A25489
Funding Number(s)
CONTRACT_GRANT: NGL-06-003-057
CONTRACT_GRANT: NAS5-23274
Distribution Limits
Public
Copyright
Other

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