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| Paper: |
The Amazing COS FUV (1320 - 1460 Å) Spectrum of λ Vel (K4Ib-II)1 |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1083 |
| Authors: |
Carpenter, K. G.; Ayres, T.; Brown, A.; Harper, G. M.; Wahlgren, G. M. |
| Abstract: |
The FUV spectrum (1320-1460 Å) of the K4 Ib-II supergiant λ Vel
was observed with the Cosmic Origins Spectrograph (COS) on HST, as
part of the Ayres and Redfield Cycle 17 SNAP program “SNAPing
Coronal Iron.” This spectrum covers a region not previously
recorded in λ Vel at high resolution and, in a mere 20 minutes of
exposure, reveals an amazing treasure trove of information. It
shows a wide variety of strong emission lines and multiple
absorption lines, superposed on a bright chromospheric continuum,
with contributions from both atomic and molecular species. These
features provide diagnostics of the chromosphere and wind of the
star, and by comparison with spectra of stars of similar Teff
and/or geff, will improve our knowledge of the heating processes
in the chromospheres and the forces driving the stellar wind in
cool evolved stars. We present the details of this spectrum, in
comparison with stars of similar temperature or luminosity, and
discuss our initial interpretation of the data. |
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