Very massive stars in not so massive clusters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10388466" target="_blank" >RIV/00216208:11320/18:10388466 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/sty2245" target="_blank" >https://doi.org/10.1093/mnras/sty2245</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/sty2245" target="_blank" >10.1093/mnras/sty2245</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Very massive stars in not so massive clusters

Popis výsledku v původním jazyce

Very young star clusters in the Milky Way exhibit a well-defined relation between their maximum stellar mass, m(max), and their mass in stars, M-ecl. A recent study shows that the young intermediate-mass star cluster VVV CL041 possibly hosts a greater than or similar to 80M(circle dot) star, WR62-2, which appears to violate the existence of the m(max)-M-ecl relation since the mass of the star is almost two times higher than that expected from the relation. By performing direct N-body calculations with the same mass as the cluster VVV CL041 (approximate to 3000M(circle dot)), we study whether such a very massive star can be formed via dynamically induced stellar collisions in a binaryrich star cluster that initially follows the m(max)-M-ecl relation. Eight out of 100 clusters form a star more massive than 80M(circle dot) through multiple stellar collisions. This suggests that the VVV CL041 cluster may have become an outlier of the relation because of its early-dynamical evolution, even if the cluster followed the relation at birth. We find that more than half of our model clusters host a merger product as its most massive member within the first 5 Myr of cluster evolution. Thus, the existence of stars more massive than the m(max)-M-ecl relation in some young clusters is expected due to dynamical processes despite the validity of the m(max)-M-ecl relation. We briefly discuss evolution of binary populations in our model.

Název v anglickém jazyce

Very massive stars in not so massive clusters

Popis výsledku anglicky

Very young star clusters in the Milky Way exhibit a well-defined relation between their maximum stellar mass, m(max), and their mass in stars, M-ecl. A recent study shows that the young intermediate-mass star cluster VVV CL041 possibly hosts a greater than or similar to 80M(circle dot) star, WR62-2, which appears to violate the existence of the m(max)-M-ecl relation since the mass of the star is almost two times higher than that expected from the relation. By performing direct N-body calculations with the same mass as the cluster VVV CL041 (approximate to 3000M(circle dot)), we study whether such a very massive star can be formed via dynamically induced stellar collisions in a binaryrich star cluster that initially follows the m(max)-M-ecl relation. Eight out of 100 clusters form a star more massive than 80M(circle dot) through multiple stellar collisions. This suggests that the VVV CL041 cluster may have become an outlier of the relation because of its early-dynamical evolution, even if the cluster followed the relation at birth. We find that more than half of our model clusters host a merger product as its most massive member within the first 5 Myr of cluster evolution. Thus, the existence of stars more massive than the m(max)-M-ecl relation in some young clusters is expected due to dynamical processes despite the validity of the m(max)-M-ecl relation. We briefly discuss evolution of binary populations in our model.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

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

—

Svazek periodika

481

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

153-163

Kód UT WoS článku

000449651400011

EID výsledku v databázi Scopus

2-s2.0-85054078164