Evidence for external plasma around the K dwarf component of the eclipsing binary V471 Tauri

Details Evidence for external plasma around the K dwarf component of the eclipsing binary V471 Tauri Evidence for external plasma around the K dwarf component of the eclipsing binary V471 Tauri

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378l..25y&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. L25-L28. Research supported by GTE Foundat

Astronomy and Astrophysics

Astrophysics

17

Cosmic Plasma, Dwarf Stars, Eclipsing Binary Stars, K Stars, Stellar Spectra, Emission Spectra, H Alpha Line, High Resolution, Radial Velocity

Scientific paper

New, higher resolution, time-resolved spectra of the H-alpha profile of V471 Tauri are presented in which transient appearances of emission components are detected at the level of 5 sigma. Measurements of the radial velocity of these components relative to the rest center of the K dwarf reveal unambiguously that they cannot originate on the surface of that star. The same measurements also rule out the white dwarf, or an accretion disk around the white dwarf, as a source of the emission. Furthermore, these external emission components are greatly enhanced immediately following the detection of a flare on the surface of the K dwarf, leading to an inference of causality. The behavior of the external emission components suggests that they arise from plasma that is held in a ring or disk orbiting the K dwarf, and that such a structure is unstable since it decays in a few days. The fate of the extruded plasma is unknown.

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