The sudden appearance of CO emission in LHA 115-S 65

Molecular emission has been detected in several Magellanic Cloud B[e] supergiants. In this Letter, we report on the detection of CO band head emission in the B[e] supergiant LHA 115-S 65, and present a K-band near-infrared spectrum obtained with the Spectrograph for INtegral Field Observation in the...

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Detalles Bibliográficos
Autores principales: Oksala, M. E., Kraus, M., Arias, María Laura, Borges Fernandes, M., Cidale, Lydia Sonia, Muratore, María Florencia, Curé, M.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Ciencias Astronómicas
Be
Circumstellar matter
Outflows
Stars: emission-line
Stars: individual: LHA115-S 65
Stars: winds
Supergiants
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84628
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84628
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
Be
Circumstellar matter
Outflows
Stars: emission-line
Stars: individual: LHA115-S 65
Stars: winds
Supergiants
spellingShingle Ciencias Astronómicas
Be
Circumstellar matter
Outflows
Stars: emission-line
Stars: individual: LHA115-S 65
Stars: winds
Supergiants
Oksala, M. E.
Kraus, M.
Arias, María Laura
Borges Fernandes, M.
Cidale, Lydia Sonia
Muratore, María Florencia
Curé, M.
The sudden appearance of CO emission in LHA 115-S 65
topic_facet Ciencias Astronómicas
Be
Circumstellar matter
Outflows
Stars: emission-line
Stars: individual: LHA115-S 65
Stars: winds
Supergiants
description Molecular emission has been detected in several Magellanic Cloud B[e] supergiants. In this Letter, we report on the detection of CO band head emission in the B[e] supergiant LHA 115-S 65, and present a K-band near-infrared spectrum obtained with the Spectrograph for INtegral Field Observation in the Near-Infrared (SINFONI; R = 4500) on the ESO VLT UT4 telescope. The observed molecular band head emission in S65 is quite surprising in the light of a previous non-detection by McGregor, Hyland & McGinn, as well as a high-resolution (R = 50 000) Gemini/Phoenix spectrum of this star taken nine months earlier showing no emission. Based on analysis of the optical spectrum by Kraus, Borges Fernandes & de Aráujo, we suspect that the sudden appearance of molecular emission could be due to density buildup in an outflowing viscous disc, as seen for Be stars. This new discovery, combined with variability in two other similar evolved massive stars, indicates an evolutionary link between B[e] supergiants and luminous blue variables.
format Articulo
Articulo
author Oksala, M. E.
Kraus, M.
Arias, María Laura
Borges Fernandes, M.
Cidale, Lydia Sonia
Muratore, María Florencia
Curé, M.
author_facet Oksala, M. E.
Kraus, M.
Arias, María Laura
Borges Fernandes, M.
Cidale, Lydia Sonia
Muratore, María Florencia
Curé, M.
author_sort Oksala, M. E.
title The sudden appearance of CO emission in LHA 115-S 65
title_short The sudden appearance of CO emission in LHA 115-S 65
title_full The sudden appearance of CO emission in LHA 115-S 65
title_fullStr The sudden appearance of CO emission in LHA 115-S 65
title_full_unstemmed The sudden appearance of CO emission in LHA 115-S 65
title_sort sudden appearance of co emission in lha 115-s 65
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/84628
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