On the outer atmospheres of hybrid stars

Details On the outer atmospheres of hybrid stars On the outer atmospheres of hybrid stars

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296..576h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 296, Sept. 15, 1985, p. 576-592. SERC-supported research.

Other

46

Iue, Late Stars, Line Spectra, Stellar Composition, Stellar Envelopes, Stellar Mass Ejection, Abundance, Chromosphere, Lyman Alpha Radiation, Photosphere, Stellar Coronas, Stellar Winds

Scientific paper

The authors discuss a variety of ultraviolet observations of four hybrid atmosphere stars, objects which exhibit both cold winds and high-temperature (transition-region) emission. New IUE data confirm that the K3 II stars ι Aur and θ Her are hybrid stars. In addition γ Aql (K3 II) is found to be another hybrid object. The analysis of the emission lines indicates that at ≡105K, the pressure is between 10-2 and 10-3 that in the solar atmosphere at the same temperature. A corona with average temperature up to ≡5×105K could be accommodated. The observed line widths indicate that turbulent pressure is important. Very deep exposures of the Mg II emission lines in α TrA show that wind absorption is visible at velocities up to 180 km s-1 relative to the photosphere.

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