Ultraviolet spectral variations of FK Comae and V 1794 Cygni |
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Affiliation: | 1. School of Public Policy and Management, University of Chinese Academy of Sciences, Beijing 100049, China;2. Business School, Beijing Normal University, Beijing 100875, China |
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Abstract: | Ultraviolet spectra of FK Comae and V1794 Cygni observed with the Hubble Space Telescope Cosmic Origins Spectrograph (HST COS) and the International Ultraviolet Explorer (IUE) satellites were analyzed for the period 1981–2011. Temporal variations of line fluxes of the O I 1306 Å, C II 1336 Å, C IV 1550 Å, He II 1640 Å and Mg II k & h 2800 Å, produced in the transition regions and chromospheres of these stars, imply variations in density and temperature changes in the line emitting regions as a result of the rapid rotation and magnetic fields responsible for stellar activity. Results are consistent with the models of Ramsey et al. (1981), Oliveira and Foing (1999), and Korhonen et al. (2000). |
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Keywords: | Stars: activity Stars: magnetic fields Stars: ultraviolet Stars: individual: (FK Com V1794 Cyg) |
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