Eta Carinae: How do we Separate Wind from Ejecta?

Details Eta Carinae: How do we Separate Wind from Ejecta? Eta Carinae: How do we Separate Wind from Ejecta?

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..332..161g&link_type=abstract

The Fate of the Most Massive Stars, ASP Conference Series, Vol. 332, Proceedings of the conference held 23-28 May, 2004 in Grand

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Scientific paper

η Car is surrounded by multiple layers of ejecta with considerable velocity differences. With HST/STIS, we can separate the star from bright, nearby nebular structures not resolved from the ground resulting in increased insight on the structure of the stellar system and its nearby ejecta.
The HST/STIS MAMA imaging echelle mode provides near-diffraction-limited spatial resolution with 0.0.125 arcsec sampling and spectral resolving power of R˜110,000 with which we can resolve spatial structure and identify outer portions of ejecta in the line of sight. The spatially-resolved line profile in the figure below was recorded on July 29, 2003 - 30 days after the X-Ray drop seen by RXTE. The position angle is 103o and the 0.3 arcsec×0.2 arcsec aperture sampled a bright continuum feature across η Car nearly to Weigelt C. The spatial extent is 0.3 arcsec and the velocity ranges from -800 to +600 km s-1. The stellar P-Cygni line is an [Fe II] line originating from 13,673 cm-1 well-isolated from other stellar lines. To the blue is a broad, diffuse absorption centered at (˜-500 km s-1). Across this 0.3 arcsec interval (˜700AU), the wind shifts by 200 km s-1 from ENE to WSW. A relatively narrow nebular absorption at -146 km s-1 is constant across both the stellar spectrum and the noticeable nebular continuum. Fainter, broader components at -182 and -122 km s-1, also present in this spectrum, shift in velocity with position. Elsewhere in the spectrum, an additional narrow absorption corresponding to -513 km s-1
shifts 20 km s-1 in the opposite direction across the spatial region. Above the spectrum (to the WSW), a broad nebular absorption extends from -146 to -45 km s-1. This originates from within the Little Homunculus.

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