Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sva....22..208k&link_type=abstract
(Astronomicheskii Zhurnal, vol. 55, Mar.-Apr. 1978, p. 363-372.) Soviet Astronomy, vol. 22, Mar.-Apr. 1978, p. 208-214. Transla
Astronomy and Astrophysics
Astronomy
5
Spaceborne Astronomy, Stellar Atmospheres, Stellar Spectra, Ultraviolet Astronomy, X Ray Sources, Binary Stars, Emission Spectra, Line Spectra, Radiant Flux Density, Stellar Models
Scientific paper
The temperature dependence of the differential emission measure (dY/dT) for Capella is computed from satellite data on emission-line intensities at wavelengths around 1500 A. Two difficulties with a previously proposed interpretation of these observations based on an analogy with the solar transition region are discussed, and a 'dynamical' model is presented instead of one with a thin motionless transition region. It is shown that a specific type of heating produces a laminar flow in the transition region and that the flow velocity varies from small values in the chromosphere to several tens of km/s at the base of the corona. The effect of turbulence on physical conditions in the transition region is examined qualitatively, and allowance for motion is found to increase the density of the outer atmosphere, which is a function of dY/dT. It is suggested that the mass-loss rate of Capella may be about 4 billionths of a solar mass per year and that a shock wave produced between the components of the Alpha Aurigae system may be the source of the detected X radiation.
Katsova M. M.
Livshits Moisey A.
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