Dwarf elliptical (dE) galaxies, with blue absolute magnitudes typically fainter thanMB=-16, are the most numerous type of galaxy in the nearby universe. Tremendous advances have been made over the past several years in delineating the properties of [...]
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Summary The VUV emission spectra from the solar atmosphere and stellar atmospheres have been intensively studied during the past 25 years with several major space programs. In this review we discuss the spectroscopic diagnostic techniques used to [...] Summary The physics of impact polarization is briefly reviewed in this paper. Methods for derivating the impact spectropolarimetric parameters relevant for the formation of Ha linear polarization are summarized. Spectropolarimetric techniques can [...] Summary In this review we discuss recent work and progress in the modelling of photospheres of stars of spectral types F and later. Special emphasis is laid on advances as regards the consideration of atomic and molecular blanketing, non-LTE and [...] |
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