Spectrophotometry of the H-alpha region in the spectrum of HR 1099 during the February 1978 radio flare

1978/12/01 by D. A. Fraquelli
Physics and Astronomy · Earth and Planetary Sciences · #Solar and Space Plasma Dynamics #Geophysics and Gravity Measurements #Ionosphere and magnetosphere dynamics

paper · doi:10.1086/112360

Abstract

Spectrophotometry of the Ha emission line in the spectrum of HR 1099 (= HD 22468= V7 11 Tauri) was obtained during the radio flare of February 1978. The profiles observed during the flare have higher peak intensities and larger equivalent widths than profiles obtained outside of the flare at approximately the same orbital phases. Both the general shapes of the profiles and the equivalent widths appear to correlate with the radio flux. A preflare profile exhibits a flare-type profile, suggesting that radio outbursts in RS CVn systems may be preceded by Ha enhancement.

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