The EUV Spectrum of AU Mic: Temperature and Density Diagnostic from EUVE Spectrometer Observations

B.C. Monsignori-Fossi (1), M. Landini (2)

1) Arcetri Astrophysical Observatory, Florence, Italy
2) Dipartimento di Astronomia e di Fisica dello Spazio, Universita di Firenze, Italy

Astronomy and Astrophysics, 284, 900, 1994

Abstract

EXOSAT and IUE observations of the active star AU Micare used to develop a model of the differential emission measure (DEM) distribution versus temperature. The signals detectable by the Extreme Ultraviolet Explorer Spectrometers are predicted. The computation indicates the presence of several highly ionized iron lines in the EUV spectral region. These lines are identified in the observations of AU Mic performed by the Short (70 -190 Å) and Medium (140-380 Å) Wavelength Spectrometers on EUVE. Using the recorded EUVE spectra a more accurate DEM model for the transition region and corona of the star has been evaluated and using density sensitive lines an upper limit has been put on the electron density.

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