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A spectrophotometric study of the planetary nebula N66 in the Large Magellanic Cloud.

Ruiz, M. T.; Peña, M.

The authors present spectrophotometric data of the LMC planetary nebula N66. Combining these observations with IUE data and ionization structure models, they derive the chemical composition of the nebula and parameters of the central star.

Multiwavelength observations of the AM Herculis type system: MR Serpentis.

Schwarzenberg-Czerny, A.; Ward, M.; Jones, D. H. P. +4 more

The authors describe simultaneous ultaviolet and optical, as well as other observations of MR Ser during a high state. No substantial linear polarization was observed during an orbital cycle, but the circular polarization was high. The ultraviolet spectrum presents strong lines in emission of N V λ1240, Si IV λ1400, C IV λ1550 and He II λ1640, typ…