Breaking news from the HST: the central star of the Stingray Nebula is now returning towards the AGB

SAO 244567 is a rare example of a star that allows us to witness stellar evolution in real time. Between 1971 and 1990, it changed from a B-type star into the hot central star of the Stingray Nebula. This observed rapid heating has been a mystery for decades, since it is in strong contradiction with...

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Detalles Bibliográficos
Autores principales: Reindl, Nicole, Rauch, T., Miller Bertolami, Marcelo Miguel, Todt, H., Werner, K.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Astronomía
stars: AGB and post-AGB
stars: atmospheres
stars: evolution
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/148026
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-148026
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
stars: AGB and post-AGB
stars: atmospheres
stars: evolution
spellingShingle Astronomía
stars: AGB and post-AGB
stars: atmospheres
stars: evolution
Reindl, Nicole
Rauch, T.
Miller Bertolami, Marcelo Miguel
Todt, H.
Werner, K.
Breaking news from the HST: the central star of the Stingray Nebula is now returning towards the AGB
topic_facet Astronomía
stars: AGB and post-AGB
stars: atmospheres
stars: evolution
description SAO 244567 is a rare example of a star that allows us to witness stellar evolution in real time. Between 1971 and 1990, it changed from a B-type star into the hot central star of the Stingray Nebula. This observed rapid heating has been a mystery for decades, since it is in strong contradiction with the low mass of the star and canonical post-asymptotic giant branch (AGB) evolution. We speculated that SAO 244567 might have suffered from a late thermal pulse (LTP) and obtained new observations with Hubble Space Telescope (HST)/COS to follow the evolution of the surface properties of SAO 244567 and to verify the LTP hypothesis. Our non-LTE spectral analysis reveals that the star cooled significantly since 2002 and that its envelope is now expanding. Therefore, we conclude that SAO 244567 is currently on its way back towards the AGB, which strongly supports the LTP hypothesis. A comparison with state-of-the-art LTP evolutionary calculations shows that these models cannot fully reproduce the evolution of all surface parameters simultaneously, pointing out possible shortcomings of stellar evolution models. Thereby, SAO 244567 keeps on challenging stellar evolution theory and we highly encourage further investigations.
format Articulo
Articulo
author Reindl, Nicole
Rauch, T.
Miller Bertolami, Marcelo Miguel
Todt, H.
Werner, K.
author_facet Reindl, Nicole
Rauch, T.
Miller Bertolami, Marcelo Miguel
Todt, H.
Werner, K.
author_sort Reindl, Nicole
title Breaking news from the HST: the central star of the Stingray Nebula is now returning towards the AGB
title_short Breaking news from the HST: the central star of the Stingray Nebula is now returning towards the AGB
title_full Breaking news from the HST: the central star of the Stingray Nebula is now returning towards the AGB
title_fullStr Breaking news from the HST: the central star of the Stingray Nebula is now returning towards the AGB
title_full_unstemmed Breaking news from the HST: the central star of the Stingray Nebula is now returning towards the AGB
title_sort breaking news from the hst: the central star of the stingray nebula is now returning towards the agb
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/148026
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