NDLI: Rotational modulation of the chromospheric activity in the young solar-type star, x-1 orionis

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Rotational modulation of the chromospheric activity in the young solar-type star, x-1 orionis

Content Provider	NASA Technical Reports Server (NTRS)
Author	Boesgaard, A. M. Simon, T.
Copyright Year	1982
Description	The IUE satellite was used to observe one of the youngest G stars (GO V) for which Duncan (1981) derives an age of 6 x 10 to the 8th power years from the Li abundance. Rotational modulation was looked for in the emission flux in the chromospheric and transition region lines of this star. Variations in the Ca 11 K-lines profile were studied with the CHF telescope at Mauna Kea. Results show that the same modulation of the emission flux of Ca 11 due to stellar rotation is present in the transition region feature of C IV and probably of He II. For other UV lines the modulation is not apparent, due to a more complex surface distribution of the active areas or supergranulation network, or a shorter lifetime of the conditions which give rise to these features, or to the uncertainities in the measured line strengths. The Mg II emission flux is constant to within + or - 3.4% implying a rather uniform distribution of Mg II emission areas. The Ca II emission not only shows a measurable variation in intensity but also variations in detailed line profile shape when observed at high resolution.
File Size	255055
Page Count	5
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19830007989
Archival Resource Key	ark:/13960/t1sf7kz3c
Language	English
Publisher Date	1982-01-01
Access Restriction	Open
Subject Keyword	Astronomy Stellar Spectra Chromosphere Emission Spectra Stars Modulation G Stars Iue Stellar Rotation Line Spectra Ultraviolet Astronomy Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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