A new feature in the spectrum of the Large Magellanic Cloud hypergiant HDE 269896

Complejo Astronómico El Leoncito (CASLEO), operated under agreement among Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Secretaría de Ciencia y Tecnología (SeCyT), and the Universities of La Plata, Córdoba, and San Juan, Argentina We have found strong selective emission of th...

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Detalles Bibliográficos
Autores principales: Corti, Mariela Alejandra, Walborn, Nolan Revere, Evans, Christopher J.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Astronómicas
HDE 269896
spectrum
Large Magellanic Cloud
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82715
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82715
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
HDE 269896
spectrum
Large Magellanic Cloud
spellingShingle Ciencias Astronómicas
HDE 269896
spectrum
Large Magellanic Cloud
Corti, Mariela Alejandra
Walborn, Nolan Revere
Evans, Christopher J.
A new feature in the spectrum of the Large Magellanic Cloud hypergiant HDE 269896
topic_facet Ciencias Astronómicas
HDE 269896
spectrum
Large Magellanic Cloud
description Complejo Astronómico El Leoncito (CASLEO), operated under agreement among Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Secretaría de Ciencia y Tecnología (SeCyT), and the Universities of La Plata, Córdoba, and San Juan, Argentina We have found strong selective emission of the N II 5000 Å complex in the spectrum of the LMC hypergiant HDE 269896, ON9.7 Ia +. Because this object also has anomalously strong He II λ4686 emission for its spectral type, an unusually wide range of ionization in its extended atmosphere is indicated. The published model of this spectrum does not reproduce these emission features, but we show that increased nitrogen and helium abundances, together with small changes in other model parameters, can do so. The morphological and possible evolutionary relationships of HDE 269896, as illuminated by the new spectral features, to other denizens of the OB Zoo are discussed. This object may be in an immediate pre-WNVL (Very Late WN) state, which is in turn the quiescent state of at least some luminous blue variables. More generally, the N II spectrum in HDE 269896 provides a striking demonstration of the occurrence of two distinctly different kinds of line behavior in O-type spectra: normal absorption lines that develop P Cygni profiles at high wind densities, and selective emission lines from the same ions that do not. Further analysis of these features will advance understanding of both atomic physics and extreme stellar atmospheres.
format Articulo
Articulo
author Corti, Mariela Alejandra
Walborn, Nolan Revere
Evans, Christopher J.
author_facet Corti, Mariela Alejandra
Walborn, Nolan Revere
Evans, Christopher J.
author_sort Corti, Mariela Alejandra
title A new feature in the spectrum of the Large Magellanic Cloud hypergiant HDE 269896
title_short A new feature in the spectrum of the Large Magellanic Cloud hypergiant HDE 269896
title_full A new feature in the spectrum of the Large Magellanic Cloud hypergiant HDE 269896
title_fullStr A new feature in the spectrum of the Large Magellanic Cloud hypergiant HDE 269896
title_full_unstemmed A new feature in the spectrum of the Large Magellanic Cloud hypergiant HDE 269896
title_sort new feature in the spectrum of the large magellanic cloud hypergiant hde 269896
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/82715
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