Volume 561, January 2014
|Number of page(s)||5|
|Section||Interstellar and circumstellar matter|
|Published online||16 January 2014|
Observations of the early stages in the formation of an LBV shell
Centro de Radioastronomía y Astrofísica, Universidad Nacional
Autónoma de Mexico, A.P. 3-72
Morelia, Michoacán Mexico
2 Instituto de Astronomía, Universidad Nacional Autónoma de Mexico, A.P. 70-264, 04510 Mexico, Mexico
Accepted: 6 December 2013
Luminous blue variables are massive stars that undergo a series of eruptive events through which they shed their outer layers before becoming Wolf-Rayet stars. During the eruptive events, their winds are denser and expand slower than in the non-eruptive state. In this paper we apply a model for the interaction of the post-eruption fast wind with the slower moving shell of dense material that was ejected during the 1994 eruption of HD 5980, a massive system located in the Small Magellanic Cloud. The model predicts a velocity for the working surface that is consistent with the velocity of insterstellar-like absorption features observed in HST/STIS spectra of 1999 and 2000, leading to the conclusion that we have witnessed for the first time the earliest stages of a circumstellar shell being formed around an LBV.
Key words: ISM: general / stars: individual: HD 5980 / stars: winds, outflows / stars: variables: general / stars: massive
© ESO, 2014
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