Upper limits on extreme ultraviolet radiation from nearby main sequence and subgiant stars

Details Upper limits on extreme ultraviolet radiation from nearby main sequence and subgiant stars Upper limits on extreme ultraviolet radiation from nearby main sequence and subgiant stars

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....70..431a&link_type=abstract

Astronomy and Astrophysics, vol. 70, no. 3, Nov. 1978, p. 431-434.

Astronomy and Astrophysics

Astronomy

5

Far Ultraviolet Radiation, Main Sequence Stars, Stellar Coronas, Stellar Radiation, X Ray Sources, Apollo Soyuz Test Project, Grazing Incidence, Grazing Incidence Telescopes, Radiant Flux Density, Spaceborne Astronomy

Scientific paper

Flux 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.

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