THE THICKNESSES AND INCLINATIONS OF 71 NORTHERN SPIRAL GALAXIES

This paper presents the thicknesses and inclinations (i.e., the angle between the galactic plane and the tangent plane) of 71 northern spira l galaxies. The method for measuring the thickness has been proposed b y Peng. It is based on the solution of Poisson's equation for a logari thmic disturbance of density. The inclination is determined by assumin g that the pattern of spiral structure is a logarithmic spiral. We fin d that the thickness is correlated with color and with the H-alpha + [ NII] equivalent width.