Statistics – Computation
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..162b&link_type=abstract
Astrophysical Journal, Part 1, vol. 251, Dec. 1, 1981, p. 162-180.
Statistics
Computation
84
Chromosphere, Cool Stars, Stellar Atmospheres, Stellar Models, Stellar Temperature, Supergiant Stars, Calcium, Emission Spectra, Iue, Late Stars, Line Spectra, Magnesium, Potassium, Ultraviolet Spectra, Velocity Distribution
Scientific paper
A semiempirical modeling of stellar chromospheres is extended to late-type supergiants, where computations match high-resolution, absolute-flux profiles of the Ca II K and Mg II h and k lines. IUE UV spectra of Epsilon Gem and Alpha Ori show no evidence of emission lines formed at temperatures greater than 10,000 K, leading to the computation of chromospheric models extending to 10 to the -6th g/sq cm at temperatures that rise to 6500 K for the former star and 7000 K for the latter. By contrast, the C II-IV, Si IV, and He II and N V strong emission lines of Beta Dra lead to a tentative chromospheric model extension to 16,000 K at 0.012 dynes/sq cm. It is pointed out that the Ca II and Mg II line analyses presented, which assume hydrostatic equilibrium with only thermal and turbulent components to the pressure, imply nearly plane-parallel chromospheres even in the case of Alpha Ori.
Basri Gibor S.
Eriksson Kimmo
Linsky Jeffrey L.
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