IUE observations of the peculiar M giant HD 4174

Details IUE observations of the peculiar M giant HD 4174 IUE observations of the peculiar M giant HD 4174

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..929s&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 15, 1980, p. 929-934.

Astronomy and Astrophysics

Astrophysics

20

Binary Stars, Giant Stars, Iue, Late Stars, M Stars, Magnetic Stars, Ultraviolet Spectra, Chromosphere, Emission Spectra, Line Spectra, Optical Emission Spectroscopy, Planetary Nebulae, Spectrum Analysis, Stellar Spectra, Stellar Temperature

Scientific paper

Ultraviolet spectra of the peculiar M giant HD 4174, which may possess a significant magnetic field, are shown to exhibit numerous high-excitation emission lines and no background continuum. Ionization equilibrium temperatures for species observed range from 6000 K (Mg II) up to 200,000 K (N v). Density diagnostics using line ratios indicate electron density of 3 x 10 to the 9th power per cu cm in the emission-line-forming region, which favorably compares with coronal model parameters previously suggested for this star. High-resolution Ca II and Mg II profiles suggest an enhanced chromospheric temperature rise. Comparison with symbiotic objects and a high-excitation planetary nebula reveals similarities among these objects.

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