The Line Profile Variations of eta Carinae Through the 2009.0 Spectroscopic Event

Details The Line Profile Variations of eta Carinae Through the 2009.0 Spectroscopic Event The Line Profile Variations of eta Carinae Through the 2009.0 Spectroscopic Event

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542607r&link_type=abstract

American Astronomical Society, AAS Meeting #215, #426.07; Bulletin of the American Astronomical Society, Vol. 42, p.342

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on high resolution echelle spectroscopy of the 2009.0 spectroscopic event of eta Carinae that we collected via SMARTS observations using the CTIO 1.5 m telescope and echelle spectrograph. Our observations were made almost every night over a two month interval around the predicted minimum of eta Car. We observed a dramatic fading of the H-alpha line emission that reached a minimum six days after the X-ray minimum. About 15 days prior to the H-alpha flux minimum, the H-alpha profile exhibited the emergence of a broad, P Cygni type, absorption component (near a Doppler shift of -500 km/s and a narrow absorption component (near -144 km/s and probably associated with intervening gas from the Little Homunculus Nebula). We also observed the He I 5876, 6678, and 7065 lines. The line profile variations are similar to those observed during previous events, and the temporal variations are consistent with qualitative expectations about changes in the primary star's stellar wind that result from the wind - wind collision with a massive binary companion.
This work was supported by the National Science Foundation under grant AST-0606861.

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