Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437..827h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 437, no. 2, p. 827-840
Other
20
Astronomical Models, Cataclysmic Variables, Cosmic Dust, Hercules Nova, Infrared Photometry, Stellar Mass Ejection, Stellar Spectrophotometry, Evolution (Development), H I Regions, Infrared Spectroscopy, Interstellar Extinction, Interstellar Gas, Stellar Luminosity, White Dwarf Stars
Scientific paper
We present near-infrared photometry and spectrophotometry of Nova Herculis 1991 (N Her). Models of the near-infrared spectra of N Her reveal that shortly after visual maximum, the ejected gas was dense (Ne greater than or = 1010/cu cm), and cool (Te = 1000 K). Models of the spectra also showed that as the first week following visual maximum progressed, the gas became hotter, and its density decreased. Within two days of visual maximum dust was condensing out of the ejecta. This limited dust formation began 5 days before the major dust shell formation event which occurred on, or near, 1991 March 31.8, 8 days after the initial outburst. This is the earliest time at which a dust shell has been observed to have been formed by a nova. The dust which formed in the ejecta of N Her was hotter (Td = 2000 K) than previously observed for a nova. We find that the Clayton & Wickramasinghe (1976) model for the formation of carbon grains adequately explains tha formation and evolution of the dust shell of N Her. We derive values of the outburst luminosity, the ejected gas and dust masses, and other parameters of the outburst of N Her, and compare these to published values.
Harrison Thomas E.
Stringfellow Guy S.
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