@proceedings{12946,
  author = {Isabella Pagano and Jeffrey Linsky and Lee Carkner and Richard Robinson and Bruce Woodgate and Gethyn Timothy},
  title = {HST/STIS echelle spectra of the dM1e star AU Microscopii outside of flares},
  abstract = {<p>We report on observations of the dM1e flare star AU Microscopii obtained with the Space Telescope Imaging Spectrograph (STIS) on 1998 September 6. A total of 10,105 s of observations were obtained with the medium-resolution E140M grating. We report here on the 9200 s of "quiescent" data when the star did not obviously flare. In this data set, we identify 142 emission lines from 28 species, including low-temperature chromospheric lines (e.g., C I, O I), transition-region lines (e.g., C II-IV, N IV, O III-V, Si II-IV), and the coronal line Fe XXI 1354 Å. There are a number of intersystem lines that are useful for measuring electron densities. We discuss line redshifts and the broad wings of transition-region lines that provide evidence of microflare heating. We derive the emission-measure distribution and compare it with the solar one. We also discuss the shape and formation mechanisms of the He II 1640 Å lines. The analysis of the flare data and of the interstellar absorption features seen in the H I, D I, C II, and O I resonance lines will be published elsewhere.</p>
},
  year = {2008},
  journal = {The Astrophysical Journal},
  volume = {532},
  pages = {497},
  month = {2008-12},
  doi = {10.1086/308559},
}