AAS 205th Meeting, 9-13 January 2005
Session 20 Variability of Eta Carinae
Poster, Monday, January 10, 2005, 9:20am-6:30pm, Exhibit Hall

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[20.01] The Homunculus Ejecta: A Comparison between HST/STIS and VLT/UVES Observation

T.R. Gull (NASA GSFC), H. Hartman (Univ of Lund), K. Nielsen (CUA & NASA GSFC), G. Vieira (SSAI & NASA GSFC), O. Stahl (Univ Heidelberg), K. Weis, D. Bomans (Univ Bochum), VLT UVES Eta Carinae Team, HST STIS Eta Carinae Treasury Team

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 10300Åand 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.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.