Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...93..255g&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 93, no. 2, May 1992, p. 255-270.
Astronomy and Astrophysics
Astronomy
60
Astronomical Photometry, Galactic Structure, Sky Surveys (Astronomy), Spiral Galaxies, Luminous Intensity, Morphology, Spectral Line Width
Scientific paper
A diameter-limited sample of 888 normal Sa-Sc galaxies was compiled from the Uppsala General Catalog. New micrometer measures of the axial ratios R of the disk components of 262 edge-on spirals in this sample were made on copies of blue Palomar Sky Survey plates and calibrated against photometric standards. The distribution of isophotal axial ratios for the whole sample was analyzed to give information on the true axial ratios R0 of spiral disks. The mean value of log R0 is 0.95 +/- 0.03 and the dispersion about this mean is 0.12 +/- 0.04. A similar mean value (0.90) was obtained from a volume-limited sub-sample of 348 spirals. The dispersion in log R0 is partly due to a dependence of R0 on morphological type, and the mean value of log R0 for each type was estimated. Inclinations of 342 edge-on (R is greater than about 3) spirals were determined from their isophotal axial ratios and types. No significant dependence of R0 on luminosity at each type was found.
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