Abstract
view Abstract Citations (11) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS ROSAT Observations of FK Comae Berenices Welty, Alan D. ; Ramsey, Lawrence W. Abstract 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. Publication: The Astronomical Journal Pub Date: July 1994 DOI: 10.1086/117069 Bibcode: 1994AJ....108..299W Keywords: Astronomical Spectroscopy; Cometary Atmospheres; Stellar Luminosity; Stellar Rotation; X Ray Astronomy; X Ray Sources; Image Analysis; Signal To Noise Ratios; Temperature Dependence; Astrophysics; STARS: INDIVIDUAL: FK COMAE BERENICES; X-RAYS: STARS; STARS: FLARE full text sources ADS | data products SIMBAD (2) HEASARC (1)
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