On the stability and pulsation in models of B[e] star MWC 137

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00583016" target="_blank" >RIV/67985815:_____/24:00583016 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0353513" target="_blank" >https://hdl.handle.net/11104/0353513</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stad3626" target="_blank" >10.1093/mnras/stad3626</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the stability and pulsation in models of B[e] star MWC 137

Popis výsledku v původním jazyce

B[e] type stars are characterized by strong emission lines, photometric, and spectroscopic variabilities and unsteady mass-loss rates. MWC 137 is a galactic B[e] type star situated in the constellation Orion. Recent photometric observation of MWC 137 by TESS has revealed variabilities with a dominant period of 1.9 d. The origin of this variability is not known but suspected to be from stellar pulsation. To understand the nature and origin of this variability, we have constructed three different set of models of MWC 137 and performed non-adiabatic linear stability analysis. Several low order modes are found to be unstable in which models having mass in the range of 31-34 M-circle dot and 43-46 M-circle dot have period close to 1.9 d. The evolution of instabilities in the non-linear regime for model having solar chemical composition and mass of 45 M-circle dot leads to finite amplitude pulsation with a period of 1.9 d. Therefore, in the present study we confirm that this variability in MWC 137 is due to pulsation. Evolutionary tracks passing through the location of MWC 137 in the Hertzsprung-Russell diagram indicate that the star is either in post main sequence evolutionary phase or about to enter in this evolutionary phase.

Název v anglickém jazyce

On the stability and pulsation in models of B[e] star MWC 137

Popis výsledku anglicky

B[e] type stars are characterized by strong emission lines, photometric, and spectroscopic variabilities and unsteady mass-loss rates. MWC 137 is a galactic B[e] type star situated in the constellation Orion. Recent photometric observation of MWC 137 by TESS has revealed variabilities with a dominant period of 1.9 d. The origin of this variability is not known but suspected to be from stellar pulsation. To understand the nature and origin of this variability, we have constructed three different set of models of MWC 137 and performed non-adiabatic linear stability analysis. Several low order modes are found to be unstable in which models having mass in the range of 31-34 M-circle dot and 43-46 M-circle dot have period close to 1.9 d. The evolution of instabilities in the non-linear regime for model having solar chemical composition and mass of 45 M-circle dot leads to finite amplitude pulsation with a period of 1.9 d. Therefore, in the present study we confirm that this variability in MWC 137 is due to pulsation. Evolutionary tracks passing through the location of MWC 137 in the Hertzsprung-Russell diagram indicate that the star is either in post main sequence evolutionary phase or about to enter in this evolutionary phase.

Druh

J_imp - Článek v periodiku v databázi Web of Science

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

2024

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

527

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

7414-7423

Kód UT WoS článku

001131511000085

EID výsledku v databázi Scopus

2-s2.0-85180006132