International ultraviolet explorer observations of Hyades stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Dwarf Stars, Iue, Star Clusters, Stellar Spectrophotometry, Ultraviolet Astronomy, X Ray Sources, Chromosphere, Emission Spectra, Line Spectra, Stellar Spectra, Stellar Temperature, Ultraviolet Spectra, Wavelengths

Scientific paper

A description is presented of International Ultraviolet Explorer (IUE) satellite observations of transition region and chromospheric emission from a group of Hyades dwarfs which are strong X-ray emitters as seen in a survey conducted by Stern et al. (1981). Short-wavelength spectra (1175-2000 A) and long-wavelength spectra (1900-3200 A) have been obtained. Although the IUE sensitivity limit did not make it possible to detect emission lines in three stars, the presence of chromospheres and transition regions could be confirmed in BD +15 deg 640, 70 Tau, BD +14 deg 693, and BD +16 deg 592. The differential emission measure has been plotted as a function of temperature for the four considered stars.

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