1996/04/29 by D. Montes, J. Sanz-Forcada, Montes, D. +5
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9604170
4 pages, latex file, 2 PostScript figures, (uses l-aa.sty and psfig.sty), tar'ed, gzip'ed. The paper (full postscript, text and figures) is also available through http://www.ucm.es/OTROS/Astrof/dpto_preprints.html Request hard copy of preprint to [email protected]. Accepted for publication in 'Astronomy and Astrophysics', Letter to the Editor
arxiv created 1996/04/29 · arxiv updated 2016/08/14
We present simultaneous Hα, Na~\sc i D1, D2, and He~\sc i D3 spectroscopic observations on the RS CVn system UX Ari. We have found a dramatic increase in the excess Hα 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 D3 in emission in coincidence with the enhancement of the Hα emission confirms the detection of a flare. The application of the spectral subtraction technique reveals that the core of the Na~\sc i D1 and D2 lines are also filled-in by chromospheric emission.