Recent observations of the WR central star of the planetary nebula LMC-N66 |
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| Authors: | Miriam Peña Manuel Peimbert Silvia Torres-Peimbert Maria Teresa Ruiz Jose Maza |
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| Institution: | (1) Instituto de Astronomía, UNAM, Apdo. Postal 70 264, 04510 México, D.F., México;(2) Depto. de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile |
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| Abstract: | The recent evolution of the central star of the planetary nebula LMC-N66 is presented. Before 1987, it showed a weak continuum with aT
eff 120 000 K andL
bol 25 000L
 and in a few years it developed strong WR features (P Cygni line profiles in N v at 124.0 nm and C IV at 155.0 nm, wide Heii emission, etc.) typical of a WN 4.5. Additionally the stellar continuum increased by a large factor and the absolute visual magnitude of the star changed from + 1.24 in 1987 to–2.57 in January, 1995. The WR features and enhanced continuum, evidencing a powerful mass-loss event remained with small variations for more than 5 years. Recent ultraviolet and optical data shows that the mass-loss seems to have diminished abruptly in the last three months. |
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| Keywords: | Planetary nebulae: individual (LMC-N66) Stars: Wolf-Rayet |
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