Steady-State Modeling and Possible Detection of HCl in Eta Carinae’s -513 km/s Ejecta

Details Steady-State Modeling and Possible Detection of HCl in Eta Carinae’s -513 km/s Ejecta Steady-State Modeling and Possible Detection of HCl in Eta Carinae’s -513 km/s Ejecta

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0909b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #09.09; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

A component of Eta Carinae’s ejecta with a radial velocity of -513 km/s has recently been found to be conducive to the formation of molecules; CH and OH have most likely been identified there. In order to explain the abundances of the already observed species in this component and also predict possible new detections, we undertook statistical equilibrium modeling with the most recent version of the steady-state chemistry code CLOUDY. One of the many features of this new version was the inclusion of more Cl-bearing species. We found that, under a wide range of physical parameters, relatively high abundances of HCl were consistently predicted by our models. Using the public domain data obtained with the STIS spectrograph aboard the Hubble Space Telescope, we searched for new molecular signatures in the spectrum of the -513 km/s component that were favored by our models. We report a probable detection of the C1Π-X1Σ+ electronic band of HCl and a tentative detection of a few rotational components of the A1Π-X1Σ+ band. >From the observed relative equivalent widths of several rotational components of the C1Π-X1Σ+ band, we estimated the rotational temperature of HCl to be Τr ≈ 500±140 K and the total column density to be Ν ≈ 1015 cm-2. This project was supported by the NSF/REU grant AST-0354056 and the Nantucket Maria Mitchell Association.

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