Physical Conditions of Eta Car Complex Environment Revealed From Photoionization Modeling

Details Physical Conditions of Eta Car Complex Environment Revealed From Photoionization Modeling Physical Conditions of Eta Car Complex Environment Revealed From Photoionization Modeling

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20711410v&link_type=abstract

American Astronomical Society Meeting 207, #114.10; Bulletin of the American Astronomical Society, Vol. 37, p.1349

Astronomy and Astrophysics

Astronomy

Scientific paper

The very massive star, Eta Carinae, is enshrouded in an unusual complex environment of nebulosities and structures. The circumstellar gas gives rise to distinct absorption and emission components at different velocities and distances from the central source(s). Through photoionization modeling, we find that the radiation field from the more massive B-star companion supports the low ionization structure throughout the 5.54 year period. The radiation field of an evolved O-star is required to produce the higher ionization emission seen across the broad maximum. Our studies utilize the HST/STIS data and model calculations of various regimes from doubly ionized species (T= 10,000K) to the low temperature (T = 760 K) conditions conductive to molecule formation (CH and OH). Overall analysis suggests the high depletion in C and O and the enrichment in He and N. The sharp molecular and ionic absorptions in this extensively CNO - processed material offers a unique environment for studying the chemistry, dust formation processes, and nucleosynthesis in the ejected layers of a highly evolved massive star.
EV research and presentation at the AAS is supported by the National Science Foundation (NSF 0206150) program.

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