Environments of evolved massive stars: evidence for episodic mass ejections

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00582414" target="_blank" >RIV/67985815:_____/23:00582414 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1017/S1743921322000060" target="_blank" >http://dx.doi.org/10.1017/S1743921322000060</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/S1743921322000060" target="_blank" >10.1017/S1743921322000060</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Environments of evolved massive stars: evidence for episodic mass ejections

Popis výsledku v původním jazyce

The post-main sequence evolutionary path of massive stars comprises various transition phases, in which the stars shed large amounts of material into their environments. Our studies focus on two of them: B[e] supergiants and yellow hypergiants, for which we investigate the structure and dynamics within their environments. We find that each B[e] supergiant is surrounded by a unique set of rings or arc-like structures. These structures are either stable over time or they display high variability, including expansion and dilution. In contrast, yellow hypergiants are embedded in multiple shells of gas and dust. These objects are famous for their outburst activity. Moreover, the dynamics in their extended atmospheres imply an enhanced pulsation activity prior to outburst. The physical mechanism(s) leading to episodic mass ejections in these two types of stars is still uncertain. We propose that strange-mode instabilities, excited in the inflated envelopes of these objects, play a significant role.

Název v anglickém jazyce

Environments of evolved massive stars: evidence for episodic mass ejections

Popis výsledku anglicky

The post-main sequence evolutionary path of massive stars comprises various transition phases, in which the stars shed large amounts of material into their environments. Our studies focus on two of them: B[e] supergiants and yellow hypergiants, for which we investigate the structure and dynamics within their environments. We find that each B[e] supergiant is surrounded by a unique set of rings or arc-like structures. These structures are either stable over time or they display high variability, including expansion and dilution. In contrast, yellow hypergiants are embedded in multiple shells of gas and dust. These objects are famous for their outburst activity. Moreover, the dynamics in their extended atmospheres imply an enhanced pulsation activity prior to outburst. The physical mechanism(s) leading to episodic mass ejections in these two types of stars is still uncertain. We propose that strange-mode instabilities, excited in the inflated envelopes of these objects, play a significant role.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA20-00150S" target="_blank" >GA20-00150S: Struktura a vývoj hvězdných výtrysků</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

The Origin of Outflows in Evolved Stars

ISBN

9781108490795

ISSN

1743-9213

e-ISSN

1743-9221

Počet stran výsledku

6

Strana od-do

51-56

Název nakladatele

Cambridge University Press

Místo vydání

Cambridge

Místo konání akce

virtual

Datum konání akce

1. 11. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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