The Quiescent and Flaring Atmosphere of the dMe Flare Star EV Lacertae

Details The Quiescent and Flaring Atmosphere of the dMe Flare Star EV Lacertae The Quiescent and Flaring Atmosphere of the dMe Flare Star EV Lacertae

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.1207o&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #12.07; Bulletin of the American Astronomical Society, Vol. 34, p.1113

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on a multi-wavelength campaign to observe flares on the dM4.5e flare star, EV Lac, in 2001 September. The campaign utilized the Chandra ACIS-HETGS, HST-STIS, VLA, and optical photometry and spectroscopy with the McDonald Observatory's 2.1 and 2.7m telescopes. The goal of the campaign was to characterize EV Lac's dynamic outer atmosphere and study the characteristics of magnetic energy release processes in a completely convective star. X-ray grating observations confirm the quiescent underabundance of iron deduced from previous low spectral resolution observations and show evidence of enhanced and variable Ne/Fe abundance ratios. Numerous flares were observed in the 100 ksec X-ray pointing; UV observations overlap one impulsive event, while radio and optical observations reveal impulsive flare signatures during a moderate X-ray flare. Preliminary results from a time-resolved spectroscopic analysis of the X-ray data will be presented, including determination of changing abundances, density, and temperature structure of the coronal plasma in EV Lac. The timing of flares in radio, UV, and optical will be compared against X-ray variations. A discussion of the observed multi-wavelength temporal trends will be given, and comparison made to solar flares. RAO acknowledges support from Chandra grant G01-2014A and HST grant GO-08880.04-A, as well as support from NRAO through a Jansky fellowship.

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