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Abstract: This is the first report on the new outburst presented by the central star ofthe LMC-N66 nebula. This object was classified as a planetary nebula, however,its true nature is under debate. In the period 1955-1990 the central star wasalmost undetectable and only nebular emission lines were observed. In 1990, thebeginning of an outburst was detected and in few months it became much brighterand developed wide He and N lines, typical of a Wolf Rayet star of theN-sequence. The maximum occurred in 1994 and afterwards the star slowly faded.Analysis of its evolution showed that it has a variable mass-loss rate whichoccasionally increases enormously, creating a false photosphere at a muchlarger radius, making it appear a few magnitudes brighter. The present outbursthas occurred 13 years after the episode from 1994 to 2000. So far this newevent has similar characteristics although there are some significantdifferences in the spectral features. We present optical and FUSE spectrashowing the main properties of this latter event.

Autor: Miriam Pena, M. Teresa Ruiz, Patricio Rojo, Silvia Torres-Peimbert, Wolf-Rainer Hamann

Fuente: https://arxiv.org/


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