HST/STIS observations of Eta Carinae: Unexplained velocity structures near the star

Details HST/STIS observations of Eta Carinae: Unexplained velocity structures near the star HST/STIS observations of Eta Carinae: Unexplained velocity structures near the star

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.6912i&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #69.12; Bulletin of the American Astronomical Society, Vol. 30, p.1351

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Scientific paper

Our HST/STIS imaging spectroscopic observations in March 1998 reveal two unexplained velocity structures moving in a polar direction within 2 seconds of arc ( ~ 5x{10(3}) A.U.) of the massive star eta Carinae. One of the two flows shows a trace of ``bipolar'' plasma flow which resembles fast moving ejecta ( ~ 300 km/s) being slowed down by the existing circumstellar medium, while the other component illustrates ubiquitous, very slow moving ejecta of ~ -40 km/s at any position along the slit. Superposition of these two velocity components in the spectroscopic image shows a pattern which resembles an ``inverse-dollar'' sign, i.e., a dollar character ``\$'' being flipped along the vertical bar. These velocity structures are quite unexpected and do not fit easily into previous ideas concerning the stellar wind.

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