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Paper: Blue variables from the MACHO database: A population of eruptive Be stars
Volume: 292, Interplay of Periodic, Cyclic and Stochastic Variability in Selected Areas of the H-R Diagram
Page: 97
Authors: Keller, S. C.; Cook, K. H.; Bessell, M. S.; Geha, M.; Syphers, D.
Abstract: We present a photometric and spectroscopic study of a population of blue variables within the MACHO LMC database. The light curves of the sample exhibit a variety of quasi-periodic and aperiodic outburst behaviour. A characteristic feature of the photometric variation is that the objects are reddest when at maximum outburst. A subset of 102 objects were examined spectroscopically. Within this subset, 91% exhibited Balmer emission in at least one epoch, in some cases with spectacular spectral variability. The variability observed in the sample is consistent with the establishment and maintenance of the Be phenomenon.
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