Published February 25, 2021 | Version v1
Poster Open

Simultaneous multi-wavelength flare observations of EV Lacertae

  • 1. NASA Goddard Space Flight Center, University of Maryland, Baltimore County
  • 2. NASA Goddard Space Flight Center
  • 3. University of Chicago
  • 4. Laboratory for Atmospheric and Space Physics, University of Colorado
  • 5. University of Hawaii



  • 1. Smithsonian Astrophysical Observatory


We acquired data of nearby dM3.5e star EV Lac using 5 different observatories: NASA's TESS mission, NASA's Neil Gehrels Swift Observatory ($Swift$), NASA's Neutron Interior Composition Explorer (NICER) and two ground based telescopes (University of Hawaii 2.2-m (UH88) and Las Cumbres Observatory Global Telescope (LCOGT) Network), to span a comprehensive, simultaneous wavelength coverage of flaring events. We identified 56 flares in the TESS light curve, 9 flares in the $Swift$ $UVM2$ light curve, 14 flares in the NICER X-ray light curve, and 1 flare in the LCOGT light curve. However, we did not identify flares in the $Swift$ XRT light curve or UH88 spectrum. We compare flare frequency distribution (FFD) of flares observed by TESS, NICER and $Swift$/UVOT. We find that the FFDs of TESS and NICER flares have comparable slopes, $\beta_{T}$ = -0.67$\pm$0.09 and $\beta_{N}$ = -0.64$\pm$0.19, and that the FFD of UVOT flares has a shallower slope ($\beta_{U}$ = -0.38$\pm$0.13).



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