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Copernicus observations of Nova Cygni 1975Near-ultraviolet radiation from Nova Cygni 1975 was detected by the Copernicus satellite on five occasions from 1975 September 1 to 1975 September 9. The nova was not seen in the UV after this date. The principal result was the observation of a broad emission feature from the Mg II doublet at 2800 A. The absence of strong UV radiation at shorter wavelengths suggests that these lines are produced by collisional excitation in the outer layers of an expanding shell with electron temperature of approximately 4000 K. The absence of observed emission lines from highly ionized species indicates that the amount of material with log T between 4.4 and 5.7 is less than 0.001 times that which produces the Mg II emission. The continuum flux in the near-UV decreased as the nova evolved, showing that the total luminosity decreased as the nova faded in the visible.
Document ID
19770041396
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Jenkins, E. B.
(Johns Hopkins Univ. Baltimore, MD, United States)
Snow, T. P.
(Johns Hopkins Univ. Baltimore, MD, United States)
Upson, W. L.
(Princeton University New Observatory, Princeton, N.J., United States)
Anderson, R.
(Johns Hopkins University Baltimore, Md., United States)
Starrfield, S. G.
(Johns Hopkins Univ. Baltimore, MD, United States)
Gallagher, J. S.
(Johns Hopkins Univ. Baltimore, MD, United States)
Friedjung, M.
(Johns Hopkins Univ. Baltimore, MD, United States)
Linsky, J. L.
(Johns Hopkins Univ. Baltimore, MD, United States)
Henry, R. C.
(Johns Hopkins Univ. Baltimore, MD, United States)
Moos, H. W.
(Johns Hopkins Univ. Baltimore, MD, United States)
Date Acquired
August 8, 2013
Publication Date
February 15, 1977
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
77A24248
Funding Number(s)
CONTRACT_GRANT: NSF MPS-75-12845
CONTRACT_GRANT: NSF AST-73-05271-A01
CONTRACT_GRANT: NGR-06-003-057
CONTRACT_GRANT: NAS5-23274
CONTRACT_GRANT: NAS5-1810
Distribution Limits
Public
Copyright
Other

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