A K-band spectral mini-survey of Galactic B[e] stars

We present a mini-survey of Galactic B[e] stars mainly undertaken with the Large Binocular Telescope (LBT). B[e] stars show morphological features with hydrogen emission lines and an infrared excess, attributed to warm circumstellar dust. In general, these features are assumed to arise from dense, n...

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Autores principales: Liermann, A., Schnurr, O., Kraus, M., Kreplin, A., Arias, María Laura, Cidale, Lydia Sonia
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85362
Aporte de:
id I19-R120-10915-85362
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
Circumstellar matter
Infrared: stars
Stars: emission line, Be
Stars: winds, outflows
Supergiants
spellingShingle Ciencias Astronómicas
Circumstellar matter
Infrared: stars
Stars: emission line, Be
Stars: winds, outflows
Supergiants
Liermann, A.
Schnurr, O.
Kraus, M.
Kreplin, A.
Arias, María Laura
Cidale, Lydia Sonia
A K-band spectral mini-survey of Galactic B[e] stars
topic_facet Ciencias Astronómicas
Circumstellar matter
Infrared: stars
Stars: emission line, Be
Stars: winds, outflows
Supergiants
description We present a mini-survey of Galactic B[e] stars mainly undertaken with the Large Binocular Telescope (LBT). B[e] stars show morphological features with hydrogen emission lines and an infrared excess, attributed to warm circumstellar dust. In general, these features are assumed to arise from dense, non-spherical, disc-forming circumstellar material in which molecules and dust can condensate. Due to the lack of reliable luminosities, the class of Galactic B[e] stars contains stars at very different stellar evolutionary phases like Herbig AeBe, supergiants or planetary nebulae. We took near-infrared long-slit K-band spectra for a sample of Galactic B[e] stars with the LBT-LUCI 1. Prominent spectral features, such as the Brackett γ line and CO band heads are identified in the spectra. The analysis shows that the stars can be characterized as evolved objects. Among others we find one luminous blue variable candidate (MWC314), one supergiant B[e]candidate with 13CO (MWC 137), and in two cases (MWC 623 and AS 381) indications for the existence of a late-type binary companion, complementary to previous studies. For MWC 84, IR spectra were taken at different epochs with LBT-LUCI 1 and the GNIRS spectrograph at the Gemini North telescope. The new data show the disappearance of the circumstellar CO emission around this star, previously detectable over decades. Also no signs of a recent prominent eruption leading to the formation of new CO disc emission are found during 2010 and 2013.
format Articulo
Articulo
author Liermann, A.
Schnurr, O.
Kraus, M.
Kreplin, A.
Arias, María Laura
Cidale, Lydia Sonia
author_facet Liermann, A.
Schnurr, O.
Kraus, M.
Kreplin, A.
Arias, María Laura
Cidale, Lydia Sonia
author_sort Liermann, A.
title A K-band spectral mini-survey of Galactic B[e] stars
title_short A K-band spectral mini-survey of Galactic B[e] stars
title_full A K-band spectral mini-survey of Galactic B[e] stars
title_fullStr A K-band spectral mini-survey of Galactic B[e] stars
title_full_unstemmed A K-band spectral mini-survey of Galactic B[e] stars
title_sort k-band spectral mini-survey of galactic b[e] stars
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85362
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