Simultaneous H$\alpha$, Na~{\sc i} D$_{1}$, D$_{2}$, and He~{\sc i} D$_{3}$ observations of a flare on the RS CVn system UX Ari

We present simultaneous H $α$ , Na~{\sc i} D $_{1}$ , D $_{2}$ , and He~{\sc i} D $_{3}$ spectroscopic observations on the RS CVn system UX Ari. We have found a dramatic increase in the excess H $α$ emission equivalent width by a factor of 2 in an interval of 1 day that indicates the beginning of a strong flare in this system. The presence of the He~{\sc i} D $_{3}$ in emission in coincidence with the enhancement of the H $α$ emission confirms the detection of a flare. The application of the spectral subtraction technique reveals that the core of the Na~{\sc i} D $_{1}$ and D $_{2}$ lines are also filled-in by chromospheric emission.

Simultaneous H $α$ , Na~{\sc i} D $_{1}$ , D $_{2}$ , and He~{\sc i} D $_{3}$ observations of a flare on the RS CVn system UX Ari

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Simultaneous H $α$ , Na~{\sc i} D $_{1}$ , D $_{2}$ , and He~{\sc i} D $_{3}$ observations of a flare on the RS CVn system UX Ari

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Simultaneous Hαα, Na~{\sc i} D11​, D22​, and He~{\sc i} D33​ observations of a flare on the RS CVn system UX Ari

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Simultaneous Hαα, Na~{\sc i} D11​, D22​, and He~{\sc i} D33​ observations of a flare on the RS CVn system UX Ari

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Simultaneous H $α$ , Na~{\sc i} D $_{1}$ , D $_{2}$ , and He~{\sc i} D $_{3}$ observations of a flare on the RS CVn system UX Ari

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Simultaneous H $α$ , Na~{\sc i} D $_{1}$ , D $_{2}$ , and He~{\sc i} D $_{3}$ observations of a flare on the RS CVn system UX Ari

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AI智能校验