Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107...75c&link_type=abstract
Astronomy and Astrophysics, vol. 107, no. 1, Mar. 1982, p. 75-87. Research supported by the Consiglio Nazionale delle Ricerche.
Astronomy and Astrophysics
Astronomy
23
A Stars, Electron Transitions, Late Stars, Spectral Energy Distribution, Stellar Models, Stellar Spectra, Ultraviolet Astronomy, Chromosphere, Emission Spectra, High Resolution, Iue, Line Spectra, Silicon, Spectral Resolution, Stellar Evolution, Ultraviolet Spectra
Scientific paper
Observations of the 1400-1800 A region in late A type stars are presented, which were obtained using the IUE satellite at low and high resolution. The calibrated energy distribution is derived and presents a large variation with wavelength in the spectral range due to Si I photoionization discontinuities. Emission lines formed in the transition region do not appear, although upper limits on the emission in these lines are established. A schematic model is proposed for the outer layers in A type stars, which suggests that the chromosphere in solar type stars is likely absent in A stars, while the NLTE photosphere could be immediately connected to the transition region, joining the upper photosphere to the corona. In addition, the amount of matter in the transition zone is found to be small.
Crivellari Lucio
Praderie Francoise
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