Optical and ultraviolet observations of a giant stellar flare on AD Leo

Details Optical and ultraviolet observations of a giant stellar flare on AD Leo Optical and ultraviolet observations of a giant stellar flare on AD Leo

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..157p&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 157-15

Astronomy and Astrophysics

Astronomy

4

Iue, Stellar Flares, Ultraviolet Astronomy, Electron Density Profiles, Stellar Spectra, Stellar Temperature

Scientific paper

A giant stellar flare has been observed on the dM4e star AD Leo simultaneously with IUE and ground-based instrumentation. The authors present and discuss observations obtained in a 15 minutes interval around flare maximum. A continuum flux distribution of flare light is obtained, based on a SWP spectrum and UBVR photometry corrected for the influence of emission lines. A high temperature (107K) free-free distribution describes the optical data well, but the observed ultraviolet flux is at least one order of magnitude smaller. No single radiation process describes the time averaged flux distribution. Line broadening is evident in hydrogen Balmer emission lines. The Inglis-Teller formula implies an upper limit of 6×1013cm-3 for the electron density.

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