Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..903j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, April 15, 1987, p. 903-937. SERC-supported researc
Astronomy and Astrophysics
Astronomy
98
Chromosphere, G Stars, K Stars, Main Sequence Stars, Stellar Atmospheres, Stellar Coronas, Ultraviolet Spectra, Emission Spectra, Iue, Radiative Transfer, Stellar Temperature, X Ray Sources
Scientific paper
Five main-sequence stars, χ1 Ori (G0 V), α Cen A (G2 V), ξ Boo A (G8 V), α Cen B (K0 V) and ɛ Eri (K2 V) have been observed at low and high dispersion with the International Ultraviolet Explorer (IUE) satellite. The data obtained and X-ray observations reported in the literature are used to make models of the structure of the atmospheres of these stars, from the high chromosphere to the corona. The electron pressures and coronal temperatures in these stars range from being similar to those in the quiet solar atmosphere (α Cen A) to the higher values found more typically in solar active regions (e.g. χ1 Ori, ξ Boo A). The models are used to examine the energy lost by radiation and transferred by thermal conduction, in order to establish the heating requirements. The results are similar to those found for the solar atmosphere.
Ayres Thomas R.
Brown Adrian
Jordan Cathy
Linsky Jeffrey L.
Simon Theodore
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