Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..241b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 1, 1984, p. 241-249.
Astronomy and Astrophysics
Astronomy
23
Chromosphere, Stellar Activity, Stellar Rotation, Ultraviolet Astronomy, Emission Spectra, Iue, Orion Constellation, Solar Spectra
Scientific paper
The solar type star χ1 Ori is thought to have an age of 6×108yr and an apparent rotation period of 5d.1. These characteristics make it well suited for a rotational modulation study of its strong ultraviolet emission lines. The authors have made IUE observations at four different phases during each of three separate rotation cycles over a time span of 325d. The data show cyclical variations in the emission lines due to C IV (1549 Å) and He II (1640 Å). The amplitude of the flux variations in C IV exceeds a factor of 2. On the other hand, the flux in the Mg II emission (2800 Å) is constant to within the photometric uncertainties of IUE. These observations are consistent with a uniform spatial distribution and brightness for the Mg II emission network and a more complicated distribution of the regions producing the ultraviolet transition region emission.
Boesgaard Ann Merchant
Simon Theodore
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