Multi-Wavelength Observations of EV Lacertae

Details Multi-Wavelength Observations of EV Lacertae Multi-Wavelength Observations of EV Lacertae

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..249o&link_type=abstract

Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present an analysis of simultaneous radio optical UV and X-ray observations of the dMe flare star EV Lacertae taken in 2001 September. The analysis is time-resolved and concentrates on determining flare-related changes in each spectral region. Temporal correlations in different wavelength regions are examined. Numerous X-ray flares were observed; two X-ray flares are accompanied by UV enhancements in a pattern reminiscent of the Neupert effect seen in solar flares where UV bursts are interpreted as a product of nonthermal heat input to the lower atmosphere and soft X-ray emission occurs as a result of the heating. An extemely large radio flare seen at two frequencies and representing a factor of 100 increase in quiescent radio flux density has an optical counterpart with an enhancement of about 3 magnitudes in the U filter. There is no corresponding increase in soft X-ray flux. We investigate scenarios which could give rise to the observed multi-wavelength correlations. The run of electron density with temperature in the outer atmosphere (transition region through corona) is investigated and implications for coronal structure are given.

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