Der hohe Prozentsatz von Variablen unter den Blauen Objekten, der in friiheren Untersuchungen gefunden worden war, wird auf 170 Tautenburger Schmidt-Platten in zwei Testfeldern bei M 31 iiberpriift. Der hohe Anteil konnte nicht bestatigt werden. Scheinbare Amplituden konnen durch die groI3en wahrscheinlichen Fehler bei der photographischen Photometrie (insbesondere an der Grenzhelligkeit der Platten) erkliirt werden, sowie durch schlechte Eignung von besonders scharfen Schmidt-Platten fur eine photographische Integralphotometrie. Von 37 untersuchten Blauen Objekten erwiesen sich nur z (VAN DEN BBRCH 5 und 12) als eindeutig variabel. Die endgiiltige Priifung von Blauen Objekten, die der Veranderlichkeit verdachtigt werden, kann jedoch nur durch photoelektrische Photometrie geschehen.The reality of the high percentage of variability among Blue Objects which was found in previous investigations was examined on 170 Tautenburg Schmidt plates of two test fields near M 31. The high percentage could not be confirmed. Spurious amplitudes can be explained by the large probable errors of the photometry (especially near the plate limit) and by bad suitability of good-looking plates. Out of 37 Blue Objects examined, onIy two (VAN DEN BERGH 5 and 12) are distinctly variable, but the final examination of Blueobjects which are suspected of variability can only be clone by photoelectric photometry.
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