Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..478e&link_type=abstract
Astrophysical Journal, Part 1, vol. 214, June 1, 1977, p. 478-487.
Astronomy and Astrophysics
Astronomy
64
Infrared Astronomy, Novae, Stellar Envelopes, Stellar Spectrophotometry, Gas Expansion, Optical Thickness, Plasma Temperature, Stellar Evolution, Stellar Models, Thermal Emission
Scientific paper
Infrared photometry from 1 to 20 microns and spectroscopy at about 2 microns are presented for Nova Cygni 1975 for the period from 2 days before to 1 yr after maximum light. The data can be explained by a simple model in which the expanding gas expelled during the explosion is always a plasma at approximately 10,000 K. Initially the gas is optically thick; this phase clearly defines the time of onset of the nova. Later, as the gas continues to expand, it becomes optically thin. The temporal dependence of the observed flux suggests that in this phase the expanding cloud is in the form of a shell. After about 300 days, long-wavelength emission which may be attributable to thermal reradiation from dust is observed.
Becklin Eric E.
Beckwith Steve
Elias Juan
Ennis D.
Gatley Ian
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