The nitrogen abundance in NGC 55 |
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Authors: | E L Agüero G J Carranza |
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Institution: | (1) Observatorio de Córdoba and CONICET, Argentina |
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Abstract: | The purpose of this paper is to propose an interpretation for the line spectrum of NGC 55, whose most remarkable feature is the absence of the generally noticeable 6584Nii]. From the physical conditions of the ionized gas responsible of the observed emission, we infer that the N(N)/N(O) abundance ratio is significantly smaller than usual, probably reflecting a nitrogen underabundance in a medium of temperatures 9100 K and densities 500 cm–3. |
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