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Eta Carinae: an Astrophysical Laboratory

Published online by Cambridge University Press:  09 August 2007

T.R. Gull ,
K.E. Nielsen ,
M.F. Corcoran ,
D.J. Hillier  and
K. Hamaguchi
T.R. Gull
Affiliation:
Astrophysical Science Division, NASA/GSFC, Code 667, Greenbelt, MD 20771, USA email: Gull@milkyway.gsfc.nasa.gov
K.E. Nielsen
Affiliation:
Astrophysical Science Division, NASA/GSFC, Code 667, Greenbelt, MD 20771, USA email: Gull@milkyway.gsfc.nasa.gov Dept of Physics & Astronomy, Catholic University of America, Washington, DC, USA email: Nielsen@milkyway.gsfc.nasa.gov
M.F. Corcoran
Affiliation:
Universities Space Research Association, 10211 Wincopin Circle, MD 21044, USA Astrophysics Science Division, NASA/GSFCr, Code 665, Greenbelt, MD 20771, USA email: Corcoran@milkyway.gsfc.nasa.gov, Kenji@milkyway.gsfc.nasa.gov
D.J. Hillier
Affiliation:
Dept of Physics & Astronomy, U of Pittsburgh, 3941 O'Hara St, Pittsburgh, PA 15260, USA email: JDH@Rosella.phyast.pitt.ast
K. Hamaguchi
Affiliation:
Universities Space Research Association, 10211 Wincopin Circle, MD 21044, USA Astrophysics Science Division, NASA/GSFCr, Code 665, Greenbelt, MD 20771, USA email: Corcoran@milkyway.gsfc.nasa.gov, Kenji@milkyway.gsfc.nasa.gov
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Abstract

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Eta Carinae (ηCar), a Luminous Blue Variable, is a massive binary star system with a 5.54-year spectroscopic period. We present temporal surface plots of selected He I, H I, Fe II and [N II] stellar line profiles measured with HST/STIS sampled from 1998.0 to 2004.3. Our analysis suggests that the profile variations are due to 1) radial velocity variations of the primary star and 2) ionization effects due to the hot companion combined with its wind cavity.

Keywords

Stars: binaries: spectroscopicmass lossejectaindividual (Eta Carinae)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 666 - 669
Copyright
Copyright © International Astronomical Union 2007

References

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