Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..863r&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August
Astronomy and Astrophysics
Astrophysics
Β Cet
Scientific paper
We present UV observations of coronal forbidden lines of highly ionized iron. Fe XXI λ1354 and Fe XII λ1242 have been observed by spectrographs on board the Hubble Space Telescope (HST), and Fe XVIII λ975 recently has been identified in spectra taken by the Far Ultraviolet Spectroscopic Explorer (FUSE). Mass motions of hot gas in the corona provide information on the heating mechanism and magnetic field strength in the corona. Observations of forbidden iron lines with these moderate to high resolution spectrographs provide a unique opportunity to study high temperature dynamics of the hot coronal plasmas. We positively detect the forbidden iron line of Fe XVIII λ975 in five stars. β Ceti shows the strongest Fe XVIII emission, and since it is a single star system, it is an ideal target to study stellar coronal dynamics. We find that the hot coronal plasma is confined, in contrast to observed downflows at the temperatures where the 105 K lines like C III λ977 form.
Ayres Thomas R.
Guinan Edward F.
Linsky Jeffrey L.
Redfield Seth
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