Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..299w&link_type=abstract
The Astronomical Journal, vol. 108, no. 1, p. 299-303
Astronomy and Astrophysics
Astronomy
10
Astronomical Spectroscopy, Cometary Atmospheres, Stellar Luminosity, Stellar Rotation, X Ray Astronomy, X Ray Sources, Image Analysis, Signal To Noise Ratios, Temperature Dependence
Scientific paper
We obtained ROSAT PSPC observations of FK Com over a period of 24.4 h, or 0.42 rotation. During the observations the x-ray flux increased by a factor of at least 5 before declining toward its previous level. A single temperature Raymond-Smith model is adequate to model the low signal-to-noise ratio spectrum from each observation interval. Initially the spectrum was that of a 8.5 x 106 K plasma, with L9sub x)=0.66 x 1031 erg s-1. When the x-ray flux was greatest, the model plasma temperature rose to 2.5 x 107 K, and Lx=3.46 x 1031 ergs-1. During the post-maximum decline in luminosity the plasma temperature was approximately 12 x 106 K. We conclude that the increase of x-ray flux recorded by ROSAT was due to an x-ray flare with a 1.5 h decline time scale.
Ramsey Lawrence W.
Welty Alan D.
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