Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980iraj...14..219b&link_type=abstract
(Astronomical Science Group of Ireland, Meeting, Armagh, Northern Ireland, June 25, 1980.) Irish Astronomical Journal, vol. 14,
Astronomy and Astrophysics
Astronomy
6
Dwarf Stars, Flare Stars, M Stars, Stellar Spectra, Ultraviolet Spectroscopy, Iue, Magnesium, Stellar Flares, Ultraviolet Astronomy
Scientific paper
Results of an IUE satellite investigation of a selection of nearby dwarf stars of spectral type M are given. Spectra were obtained for seven stars in IUE's long wavelength range and for three stars in the short wavelength range, including both known flare stars and stars as yet not known to flare. The most prominent feature of the long wavelength spectra is the ionized magnesium h and k resonance doublet at 2795/7A wavelength. Radii are estimated from the mean of results obtained from mean relationships between radius and absolute magnitude, radius and spectral type, and from empirical relationships between radius and the star's colors. The most active flare stars show higher emission, suggesting a greater rate of energy deposition in their lower chromospheres. The short wavelength data included the first-ever UV spectrum of a flaring star. Most sample stars showed strong lines in the short wavelength region, and their surface fluxes were calculated and compared to the quiet sun.
Andrews David A.
Butler John C.
Byrne Brendan P.
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