Near-infrared Characterization of Four Massive Stars in Transition Phases

Massive stars typically undergo short-lived post-main sequence evolutionary phases with strong mass loss and occasional mass eruptions. Many of such massive stars in transition phases have been identified based on their dusty envelopes. The ejected material often veils the stellar photospheres so th...

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Detalles Bibliográficos
Autores principales: Cochetti, Yanina Roxana, Kraus, Michaela, Arias, María Laura, Cidale, Lydia Sonia, Eenmäe, Tõnis, Liimets, T., Torres, Andrea Fabiana, Djupvik, A. A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Astronomía
Early-type emission stars
Circumstellar matter
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/128616
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-128616
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
Early-type emission stars
Circumstellar matter
spellingShingle Astronomía
Early-type emission stars
Circumstellar matter
Cochetti, Yanina Roxana
Kraus, Michaela
Arias, María Laura
Cidale, Lydia Sonia
Eenmäe, Tõnis
Liimets, T.
Torres, Andrea Fabiana
Djupvik, A. A.
Near-infrared Characterization of Four Massive Stars in Transition Phases
topic_facet Astronomía
Early-type emission stars
Circumstellar matter
description Massive stars typically undergo short-lived post-main sequence evolutionary phases with strong mass loss and occasional mass eruptions. Many of such massive stars in transition phases have been identified based on their dusty envelopes. The ejected material often veils the stellar photospheres so that the central stars cannot be assigned proper spectral types and evolutionary stages. The infrared spectral range has proved to be ideal for the classification of evolved massive stars and for the characterization of their environments. To improve our knowledge on the central stars of four such dust enshrouded objects: [GKF2010] MN 83, [GKF2010] MN 108, [GKF2010] MN 109, and [GKF2010] MN 112, we collect and present their first medium resolution K-band spectra in the $2.3\,-\,2.47\,\mu$m region and discuss the location of the stars in the JHK color-color diagram. We find that the emission-line spectra of both MN 83 and MN 112 show characteristics typically seen in Luminous Blue Variable (LBV) stars. In addition, we propose that the presence and strength of the newly reported Mg II lines might be used as a new complementary criterion to identify LBV candidates. The spectra of the other two objects imply that MN 108 is an O-type supergiant, whereas MN 109 could be an LBV candidate in its active phase. We derive lower limits for the reddening toward the stars and find that three of all de-reddened fall into the region of confirmed LBVs.
format Articulo
Articulo
author Cochetti, Yanina Roxana
Kraus, Michaela
Arias, María Laura
Cidale, Lydia Sonia
Eenmäe, Tõnis
Liimets, T.
Torres, Andrea Fabiana
Djupvik, A. A.
author_facet Cochetti, Yanina Roxana
Kraus, Michaela
Arias, María Laura
Cidale, Lydia Sonia
Eenmäe, Tõnis
Liimets, T.
Torres, Andrea Fabiana
Djupvik, A. A.
author_sort Cochetti, Yanina Roxana
title Near-infrared Characterization of Four Massive Stars in Transition Phases
title_short Near-infrared Characterization of Four Massive Stars in Transition Phases
title_full Near-infrared Characterization of Four Massive Stars in Transition Phases
title_fullStr Near-infrared Characterization of Four Massive Stars in Transition Phases
title_full_unstemmed Near-infrared Characterization of Four Massive Stars in Transition Phases
title_sort near-infrared characterization of four massive stars in transition phases
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/128616
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bdutipo_str Repositorios
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