Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5120g&link_type=abstract
American Astronomical Society, AAS Meeting #211, #51.20; Bulletin of the American Astronomical Society, Vol. 39, p.818
Other
Scientific paper
The ultraviolet spectrum of HD 44179, the central star(s) of the Red Rectangle nebula, provides key information about the origin and evolution of the as yet unidentified molecular species responsible for complex spectral features seen at longer wavelengths. We have positively identified over 30 electronic-vibrational bands due to CO, the dominant molecular species that is detected at photon energies required for the production of more complex molecules. We derive a column density of 2.7x1017cm-2 for the 4th Positive A-X system in absorption. The rotation and vibration temperatures are both approximately 2000 K, while the electronic fluorescence requires substantially higher temperatures. The flux shortward of 2000 A is a complex blend of CO features with no discernible stellar photosphere, making the identification of other molecular species difficult, and the direct derivation of the dust extinction curve impossible. We also detect the spin-forbidden CO a'-X, d-X, and e-X absorption features. Along with the A-X (and a-X) bands, these five band systems are responsible for the complex absorption and emission observed at wavelengths shortward of 2200 A. We also confirm the presence of the OH "comet-band'' system near 3000 A, suggesting that the interior regions of the Red Rectangle are not devoid of O-rich species.
Bernstein Lawrence S.
Glinski Robert J.
Sitko Michael L.
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