Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.5307h&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #53.07; Bulletin of the American Astronomical Society, Vol. 26, p.947
Astronomy and Astrophysics
Astronomy
Scientific paper
We have observed Nova Cygni 1992 at 7 epochs using Cornell's SpectroCam-10 camera/spectrograph on the 200-inch Hale telescope. Low-resolution (lambda /Delta lambda ~ 100) spectra spanning 7.5 -- 13.5 microns were taken on each date. The free-free continuum, hydrogen recombination line, and [Ne II] 12.8 microns emission observed in April 1992 declined through January 1993, by which time even the [Ne II] emission was undetectable. Between August and November 1992 a strong [Ne VI] 7.66 microns coronal line appeared, accompanied by a weaker [Ar III] 8.99 microns feature. Remarkably, subsequent observations showed that these lines remained nearly constant in intensity through October 1993, our most recent observation. Medium-resolution (lambda /Delta lambda ~ 2000) spectra of the [Ne II] line showed that a double-peaked profile with FWHM ~ 2200 km s(-1) observed in April 1992 changed to a flat-topped shape by August, similar to the shape of optical lines. The [Ne VI] line exhibited a similar width in both November 1992 and October 1993. Our data show no evidence for dust at any epoch. We will discuss the implications of our unique data set on the dynamics, ionization structure, and elemental abundances of the nova shell.
Hayward Thomas L.
Houck James R.
Miles John Wesley
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