A sharpened H-alpha + forbidden N II image of the nebula surrounding nova V1500 Cygni (1975)

Details A sharpened H-alpha + forbidden N II image of the nebula surrounding nova V1500 Cygni (1975) A sharpened H-alpha + forbidden N II image of the nebula surrounding nova V1500 Cygni (1975)

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1738w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Nov. 1991, p. 1738-1741, 1916.

Astronomy and Astrophysics

Astronomy

6

Cygnus Constellation, H Alpha Line, Nebulae, Stellar Envelopes, Astronomical Photometry, Stellar Spectra

Scientific paper

An image of the resolved nebular remnant of Nova Cygni 1975 (V1500 Cygni), obtained in 1987 July, is presented. 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 arcsec, 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, the 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 (1986) is used, the observations imply a distance of 1.56 +/- 0.08 kpc. Flux measurements of the star-plus-nebular system at H-alpha + forbidden N II for 1983 September and 1987 July are also provided, along with monochromatic flux densities at H-alpha for several nearby stars.

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