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Title:
A New Outburst in the Extraordinary Central Star of LMC-N661,
Authors:
Peña, Miriam; Ruiz, Maria Teresa; Rojo, Patricio; Torres-Peimbert, Silvia; Hamann, Wolf-Rainer
Affiliation:
AA(Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70264, México, D.F. 04510, México .), AB(Departamento de Astronomía, Universidad de Chile, Casilla 36D, Santiago, Chile.), AC(Departamento de Astronomía, Universidad de Chile, Casilla 36D, Santiago, Chile.), AD(Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70264, México, D.F. 04510, México .), AE(Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany.)
Publication:
The Astrophysical Journal, Volume 680, Issue 2, pp. L109-L111. (ApJ Homepage)
Publication Date:
06/2008
Origin:
UCP
ApJ Keywords:
planetary nebulae: individual (LMC-N66), Stars: Mass Loss, Stars: Winds, Outflows, Stars: Wolf-Rayet
Abstract Copyright:
(c) 2008: The American Astronomical Society
DOI:
10.1086/589999
Bibliographic Code:
2008ApJ...680L.109P

Abstract

This is the first report on the new outburst presented by the central star of the 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 was almost undetectable and only nebular emission lines were observed. In 1990, the beginning of an outburst was detected and in few months it became much brighter and developed wide He and N lines, typical of a Wolf-Rayet star of the N-sequence. The maximum occurred in 1994 and afterward the star slowly faded. Analysis of its evolution showed that it has a variable mass-loss rate which occasionally increases enormously, creating a false photosphere at a much larger radius, making it appear a few magnitudes brighter. The present outburst has occurred 13 years after the episode from 1994 to 2000. So far this new event has similar characteristics although there are some significant differences in the spectral features. We present optical and FUSE spectra showing the main properties of this latter event.

Based on observations made with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer (FUSE), operated for NASA by the John Hopkins University under NASA contract NAS5-32985.

Based on observations obtained at Las Campanas (Carnegie).

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