Spectroscopic Diagnostics for Circumstellar Disks of B[e] Supergiants

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Spectroscopic Diagnostics for Circumstellar Disks of B[e] Supergiants

Popis výsledku v původním jazyce

B[e] supergiants (B[e]SGs) are emission-line objects, presumably in a short-lived phase in the post-main sequence evolution of massive stars. Their intense infrared excess emission indicates large amounts of warm circumstellar dust. It has long been assumed that the stars possess an aspherical wind consisting of a classical line-driven wind in the polar direction and a dense, slow equatorial wind dubbed out-flowing disk. The general properties obtained for these disks are in line with this scenario, although current theories have considerable difficulties reproducing the observed quantities. Therefore, more sophisticated observational constraints are needed. These follow from combined optical and infrared spectroscopic studies, which delivered the surprising result that the circumstellar material of B[e]SGs is concentrated in multiple rings revolving the stars on stable Keplerian orbits. Such a scenario requires new ideas for the formation mechanism where pulsations might play an important role.

Název v anglickém jazyce

Spectroscopic Diagnostics for Circumstellar Disks of B[e] Supergiants

Popis výsledku anglicky

B[e] supergiants (B[e]SGs) are emission-line objects, presumably in a short-lived phase in the post-main sequence evolution of massive stars. Their intense infrared excess emission indicates large amounts of warm circumstellar dust. It has long been assumed that the stars possess an aspherical wind consisting of a classical line-driven wind in the polar direction and a dense, slow equatorial wind dubbed out-flowing disk. The general properties obtained for these disks are in line with this scenario, although current theories have considerable difficulties reproducing the observed quantities. Therefore, more sophisticated observational constraints are needed. These follow from combined optical and infrared spectroscopic studies, which delivered the surprising result that the circumstellar material of B[e]SGs is concentrated in multiple rings revolving the stars on stable Keplerian orbits. Such a scenario requires new ideas for the formation mechanism where pulsations might play an important role.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA14-21373S" target="_blank" >GA14-21373S: Odhalení historie ztráty hmoty vyvinutých masivních hvězd</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

B(e) Phenomenon: Forty Years of Studies

ISBN

9781583819005

ISSN

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e-ISSN

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Počet stran výsledku

10

Strana od-do

219-228

Název nakladatele

Astronomical Society of the Pacific

Místo vydání

San Francisco

Místo konání akce

Prague

Datum konání akce

27. 6. 2016

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

000401591600030