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An image database. II. Catalogue between δ=-30deg and δ=70deg.
A preliminary list of 68.040 galaxies was built from extraction of35.841 digitized images of the Palomar Sky Survey (Paper I). For eachgalaxy, the basic parameters are obtained: coordinates, diameter, axisratio, total magnitude, position angle. On this preliminary list, weapply severe selection rules to get a catalog of 28.000 galaxies, wellidentified and well documented. For each parameter, a comparison is madewith standard measurements. The accuracy of the raw photometricparameters is quite good despite of the simplicity of the method.Without any local correction, the standard error on the total magnitudeis about 0.5 magnitude up to a total magnitude of B_T_=17. Significantsecondary effects are detected concerning the magnitudes: distance toplate center effect and air-mass effect.
| An objective prism survey of emission line galaxies
The first list of emission line objects detected as part of an objectprism survey of emission line galaxies begun in China in 1981 ispresented. The instrument and observations are described, and theidentification of emission-line galaxies is discussed. The spectralstructural classification of the presented objects is addressed. On adozen plates covering some 220 square degrees of sky, 50 emission lineobjects were detected, 47 of which are galaxies and the other three ofwhich are planetary nebulae. Finding charts of the objects arepresented.
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