Simultaneous X-ray and optical monitoring of the flare star YZ CMi

Details Simultaneous X-ray and optical monitoring of the flare star YZ CMi Simultaneous X-ray and optical monitoring of the flare star YZ CMi

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223p...1d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Nov. 1, 1986, p. 1P-5P.

Astronomy and Astrophysics

Astronomy

9

Flare Stars, Stellar Flares, Stellar Spectrophotometry, Variable Stars, X Ray Stars, Balmer Series, Chromosphere, Prominences, Stellar Activity, X Ray Absorption

Scientific paper

Broad-band photometric observations of YZ CMi show a 1.2 mag U-band flare, however, simultaneous X-ray observations from EXOSAT show no detectable increase. It is suggested that the event could have occurred low down in a part of the chromosphere, which may not have been coupled to the transition region and corona via magnetic fields. However, a more plausible explanation may have been absorption of the X-rays by an over-lying dense prominence. Several short-lived enhancements (micro-flares) were detected in both the Johnson U-band and the Balmer emission lines.

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