Revisiting the evolved hypergiants in the Magellanic Clouds

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F22%3A00555510" target="_blank" >RIV/67985815:_____/22:00555510 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/stac386" target="_blank" >https://doi.org/10.1093/mnras/stac386</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stac386" target="_blank" >10.1093/mnras/stac386</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Revisiting the evolved hypergiants in the Magellanic Clouds

Popis výsledku v původním jazyce

In the present study, we revise the evolutionary state of eight hypergiants in the Magellanic Clouds, four of early-A type and four of FG type, and complement the short list of the eruptive post-RSGs termed as yellow hypergiants. We refine the outdated temperatures and luminosities of the stars by means of high-resolution spectroscopy with the Fiber-fed Extended Range Optical Spectrograph (FEROS). The A-type stars are suggested to be in their early, post-main-sequence phase, showing spectrophotometric characteristics of redward evolving supergiants. On the other hand, the FG-type stars manifest themselves through the enhanced atmospheric activity that is traced by emission filling in H alpha and the dynamical modulation of the low-excitation Ba ii line. Of these stars, the dusty HD269723 is suggested to have recently departed from a cool phase. We identify double-peaked emission in the FEROS data of HD269953 that emerges from an orbiting disc-hosting companion. The highlight of the study is an episode of enhanced mass-loss of HD271182 that manifests as a dimming event in the light curve and renders the star 'modest' analogue to rho Cas. The luminosity log (L/L-circle dot) = 5.6 of HD271182 can serve as an updated threshold for the luminosity of stars exhibiting a post-RSG evolution in the Large Magellanic Cloud.

Název v anglickém jazyce

Revisiting the evolved hypergiants in the Magellanic Clouds

Popis výsledku anglicky

In the present study, we revise the evolutionary state of eight hypergiants in the Magellanic Clouds, four of early-A type and four of FG type, and complement the short list of the eruptive post-RSGs termed as yellow hypergiants. We refine the outdated temperatures and luminosities of the stars by means of high-resolution spectroscopy with the Fiber-fed Extended Range Optical Spectrograph (FEROS). The A-type stars are suggested to be in their early, post-main-sequence phase, showing spectrophotometric characteristics of redward evolving supergiants. On the other hand, the FG-type stars manifest themselves through the enhanced atmospheric activity that is traced by emission filling in H alpha and the dynamical modulation of the low-excitation Ba ii line. Of these stars, the dusty HD269723 is suggested to have recently departed from a cool phase. We identify double-peaked emission in the FEROS data of HD269953 that emerges from an orbiting disc-hosting companion. The highlight of the study is an episode of enhanced mass-loss of HD271182 that manifests as a dimming event in the light curve and renders the star 'modest' analogue to rho Cas. The luminosity log (L/L-circle dot) = 5.6 of HD271182 can serve as an updated threshold for the luminosity of stars exhibiting a post-RSG evolution in the Large Magellanic Cloud.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

511

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

4360-4376

Kód UT WoS článku

000760980600002

EID výsledku v databázi Scopus

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