Ultraviolet observations of cool stars. VI - L alpha and MG II emission line profiles (and a search for flux variability) in Arcturus

Details Ultraviolet observations of cool stars. VI - L alpha and MG II emission line profiles (and a search for flux variability) in Arcturus Ultraviolet observations of cool stars. VI - L alpha and MG II emission line profiles (and a search for flux variability) in Arcturus

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apjs...37..223m&link_type=abstract

Astrophysical Journal Supplement Series, vol. 37, June 1978, p. 223-233.

Astronomy and Astrophysics

Astronomy

18

Chromosphere, Cool Stars, Emission Spectra, Late Stars, Stellar Spectrophotometry, Stellar Temperature, Ultraviolet Astronomy, Abundance, Atomic Spectra, Line Spectra, Magnesium, Oao 3, Oxygen Spectra, Ultraviolet Spectra

Scientific paper

High-precision, high-resolution profiles of the L alpha and Mg II k chromospheric emission lines from Arcturus (alpha Boo) obtained with the Princeton Experimental Package aboard the Copernicus satellite are presented. Asymmetries seen in the profiles of these lines are probably intrinsic to the star, rather than the result of interstellar absorption. In contrast to previous observations of the Ca II K emission line, no evidence is found during a three-year period for variability in the profiles or in the total fluxes from these lines on time scales ranging from hours to months. Also presented is a flux profile of the O I 1302 line and flux upper limits for L beta, O VI 1032, Si III 1206, and O V 1218.

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