Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248l..73h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 248, Sept. 1, 1981, p. L73-L76.
Astronomy and Astrophysics
Astrophysics
27
Chromosphere, Dwarf Stars, Stellar Rotation, Stellar Spectra, Stellar Spectrophotometry, Ultraviolet Spectra, Emission Spectra, H Lines, Iue, K Stars, Line Spectra, Lyman Alpha Radiation, Magnesium, Main Sequence Stars, Silicon, Stellar Radiation, Variable Stars
Scientific paper
Periodic variations in the ultraviolet fluxes of chromospheric emission line multiplets are investigated for F, G and K stars as evidence of rotational modulation. Vacuum ultraviolet spectra were obtained with the IUE spacecraft for six stars as many as 11 times over the period April 23 to December 3, 1980. Variations in the emission fluxes of the hydrogen Lyman-alpha, Si II and Mg II lines are observed with periods up to 47 days. The periodicity, which is identified with rotational modulation, is found to persist over many rotational cycles, although the periods and time dependences of the fluxes from the different ionic species are not identical, probably due to differential rotation and global distributions. The spread of the UV periods is observed to be within 10%, with one or two peaks per cycle and a ratio of modulated to umodulated flux ranging from 1.1 to 3.0, analogous to solar behavior.
Hallam Kenneth L.
Wolff Charles L.
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