A sharpened Hα+[N II] image of the nebula surrounding Nova V1500 Cygni (1975)

Richard A. Wade, Robin Bruce Ciardullo, G. H. Jacoby, N. A. Sharp

Research output: Contribution to journalArticle

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Abstract

We present an image of the resolved nebular remnant of Nova Cygni 1975 (V1500 Cygni), obtained in 1987 July. The image has been enhanced by sharpening techniques, with the central star both retained and removed by point-spread-function subtraction. The median nebular radius at that time was 1″.90±0″.10, and the structure in projection was essentially that of a circular annulus. "Blob and ring" models of the ejected material, previously proposed, do not seem to match well with the actual image. If the ejection was roughly spherical, our observations coupled with the expansion velocity derived from the principal absorption spectrum imply a distance of 2.11±0.10 kpc for the nova. If the emission-line expansion velocity measured by Cohen [ApJ, 292, 90 (1985)] is used, our observations imply a distance of 1.56±0.08 kpc. We also provide flux measurements of the star-plus-nebula system at Hα + [N II] for 1983 September and 1987 July, along with monochromatic flux densities at Ha for several nearby stars.

Original languageEnglish (US)
Pages (from-to)1738-1741
Number of pages4
JournalAstronomical Journal
Volume102
Issue number5
StatePublished - Nov 1991

Fingerprint

nebulae
stars
expansion
annuli
flux measurement
absorption spectrum
point spread functions
subtraction
ejection
flux density
projection
absorption spectra
radii
rings

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Wade, Richard A. ; Ciardullo, Robin Bruce ; Jacoby, G. H. ; Sharp, N. A. / A sharpened Hα+[N II] image of the nebula surrounding Nova V1500 Cygni (1975). In: Astronomical Journal. 1991 ; Vol. 102, No. 5. pp. 1738-1741.
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Wade, RA, Ciardullo, RB, Jacoby, GH & Sharp, NA 1991, 'A sharpened Hα+[N II] image of the nebula surrounding Nova V1500 Cygni (1975)', Astronomical Journal, vol. 102, no. 5, pp. 1738-1741.

A sharpened Hα+[N II] image of the nebula surrounding Nova V1500 Cygni (1975). / Wade, Richard A.; Ciardullo, Robin Bruce; Jacoby, G. H.; Sharp, N. A.

In: Astronomical Journal, Vol. 102, No. 5, 11.1991, p. 1738-1741.

Research output: Contribution to journalArticle

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N2 - We present an image of the resolved nebular remnant of Nova Cygni 1975 (V1500 Cygni), obtained in 1987 July. The image has been enhanced by sharpening techniques, with the central star both retained and removed by point-spread-function subtraction. The median nebular radius at that time was 1″.90±0″.10, and the structure in projection was essentially that of a circular annulus. "Blob and ring" models of the ejected material, previously proposed, do not seem to match well with the actual image. If the ejection was roughly spherical, our observations coupled with the expansion velocity derived from the principal absorption spectrum imply a distance of 2.11±0.10 kpc for the nova. If the emission-line expansion velocity measured by Cohen [ApJ, 292, 90 (1985)] is used, our observations imply a distance of 1.56±0.08 kpc. We also provide flux measurements of the star-plus-nebula system at Hα + [N II] for 1983 September and 1987 July, along with monochromatic flux densities at Ha for several nearby stars.

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