Broadening of hydrogen Balmer lines during a flare on the dMe star YZ CMi
Broad-band photometric observations of YZ CMi show a 1.2 magnitude U-band flare at 19:55 UT on 4 March 1985. During the flare, optical spectra show excess emission in the wings of all the hydrogen Balmer lines. Interpreted in terms of mass flows would imply material moving at ∼300 km s−1 simultaneously to the blue and red or alternatively random mass motions with a velocity of a similar magnitude. At flare maximum, all the Balmer lines show excess emission in the wings with H α and 11 δ showing symmetrically broadened lines while higher members of the series such as H ζ and H η show predominately red shifted material.
KeywordsSolar Phys Solar Flare Balmer Line Excess Emission Flare Star
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