Outer atmospheric properties of Beta Draconis (G2 Ib-2)

Details Outer atmospheric properties of Beta Draconis (G2 Ib-2) Outer atmospheric properties of Beta Draconis (G2 Ib-2)

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..142b&link_type=abstract

In ESA 3rd European IUE Conf. p 142-148 (SEE N83-11889 02-88)

Computer Science

1

Electron Pressure, Stellar Atmospheres, Stellar Coronas, Supergiant Stars, Escape Velocity, Iue, Line Spectra, Stellar Mass, Stellar Radiation, Stellar Winds, X Ray Spectra

Scientific paper

Observations of the supergiant Beta Draconis made by IUE are discussed. Electron pressure is comparable with that found in the quiet solar atmosphere. The X-ray fluxes from previous observations suggest T = 10 to 20 million k, when combined with the analysis of the IUE spectra; this would be greater than the proton escape velocity. The radiation losses between 10,000 and 100,000 K exceed those from the Sun by an order of magnitude, but in the absence of a stellar wind the energy losses from the corona would be lower than in the Sun. The line profile widths indicate substantial (M=2) nonthermal broadening. If interpreted as energy associated with a wave flux, they would imply more coronal energy than required by radiation and conduction losses, suggesting an energetic mass loss. However, line asymmetries can also be interpreted as motions within the atmosphere.

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