HST/STIS Echelle Spectra of the dM1e Star AU Microscopii Outside of Flares

Details HST/STIS Echelle Spectra of the dM1e Star AU Microscopii Outside of Flares HST/STIS Echelle Spectra of the dM1e Star AU Microscopii Outside of Flares

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...532..497p&link_type=abstract

The Astrophysical Journal, Volume 532, Issue 1, pp. 497-513.

Astronomy and Astrophysics

Astronomy

34

Stars: Chromospheres, Stars: Coronae, Stars: Flare, Ultraviolet: Stars

Scientific paper

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. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with proposal ID 7556.

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