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: | , , , , , |
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Formato: | Articulo |
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2014
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/85362 |
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I19-R120-10915-85362 |
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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 |
work_keys_str_mv |
AT liermanna akbandspectralminisurveyofgalacticbestars AT schnurro akbandspectralminisurveyofgalacticbestars AT krausm akbandspectralminisurveyofgalacticbestars AT kreplina akbandspectralminisurveyofgalacticbestars AT ariasmarialaura akbandspectralminisurveyofgalacticbestars AT cidalelydiasonia akbandspectralminisurveyofgalacticbestars AT liermanna kbandspectralminisurveyofgalacticbestars AT schnurro kbandspectralminisurveyofgalacticbestars AT krausm kbandspectralminisurveyofgalacticbestars AT kreplina kbandspectralminisurveyofgalacticbestars AT ariasmarialaura kbandspectralminisurveyofgalacticbestars AT cidalelydiasonia kbandspectralminisurveyofgalacticbestars |
bdutipo_str |
Repositorios |
_version_ |
1764820489329442817 |