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

Details 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 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

1996-04-29

arxiv.org/abs/astro-ph/9604170v1

Astronomy and Astrophysics

Astrophysics

4 pages, latex file, 2 PostScript figures, (uses l-aa.sty and psfig.sty), tar'ed, gzip'ed. The paper (full postscript, text an

Scientific paper

We present simultaneous H$\alpha$, 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$\alpha$ 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$\alpha$ 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.

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