Evidence of large-scale structures in the atmosphere of the active K-dwarf component of V471 TauriContemporaneous IUE ultraviolet spectra and visible photoelectric data of the eclipsing binary V471 Tauri (K2V + DA) between 1979 and 1985 was analyzed. The combined data detail the three-dimensional structure of atmospheric loops and their associated starspots on the K dwarf. The distribution of starspot regions on the surface of the K star was inferred from the visible photometry. When spots are located near the limb of the K dwarf prior to and shortly after the total eclipse of the white dwarf, absorption lines such as C II, C III, c IV, and Si IV appear superimposed on the continuum of the white dwarf. These absorption lines are likely caused by cool coronal loops overlying the spots in the atmosphere of the K dwarf. The loops can extend nearly one stellar radius above the surface of the K2V star.
Document ID
19870009762
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Guinan, E. F. (Villanova Univ. PA, United States)
Raymond, J. C. (Villanova Univ. PA, United States)
Raymond, J. C. (Villanova Univ. PA, United States)
Raymond, J. C. (Villanova Univ. PA, United States)
Raymond, J. C. (Villanova Univ. PA, United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1986
Publication Information
Publication: ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE