Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.2001g&link_type=abstract
American Astronomical Society Meeting 205, #20.01; Bulletin of the American Astronomical Society, Vol. 36, p.1375
Astronomy and Astrophysics
Astronomy
Scientific paper
HST/STIS echelle spectra reveal nearly 20 velocity components corresponding to ejecta in the Homunculus wall and in the Little Homunculus, plus several ISM velocity components. With 100,000 resolving power and 0.05" angular resolution, we see the ejecta components against the stellar spectrum and the nebular spectrum. Velocities of these components shift rapidly in velocity with position.
The VLT/UVES spectra provides R=40,000 to 80,000 and seeing-limited spatial resolution of 1".The two datasets overlap from 3040 to 3159Å. The measured equivalent widths are strikingly different primarily due to nebular-scattered light contributing to the UVES spectrum. Additional measures with STIS CCD medium dispersion (R 7000, ang res 0.1") provide comparisons of equivalent widths out to 10300Å and suggest decreasing scattered light contribution with increasing wavelength. Comparisons of measured velocities, line profiles, equivalent widths and column densities will be made to provide insight on bringing the three datasets together.
These observations were provided through STScI, funded by NASA-funded HST GO and STIS GTO grants, and through the European Southern Observatory.
Bomans Dominik
Gull Ted R.
Hartman Henrik
HST STIS Eta Carinae Treasury Team
Nielsen Krister
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