On the Star Formation Efficiencies and Evolution of Multiple Stellar Generations in Globular Clusters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00519295" target="_blank" >RIV/67985815:_____/19:00519295 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3847/1538-4357/ab2455" target="_blank" >https://doi.org/10.3847/1538-4357/ab2455</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ab2455" target="_blank" >10.3847/1538-4357/ab2455</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the Star Formation Efficiencies and Evolution of Multiple Stellar Generations in Globular Clusters

Popis výsledku v původním jazyce

By adopting empirical estimates of the helium enhancement (AY) between consecutive stellar generations for a sample of Galactic globular clusters (GGCs), we uniquely constraint the star formation efficiency (epsilon) of each stellar generation in these stellar systems. In our approach, the star formation efficiency (epsilon) is the central factor that links stellar generations as it defines both their stellar mass and the remaining mass available for further star formation, fixing also the amount of matter required to contaminate the next stellar generation. In this way, epsilon is here shown to be fully defined by the He enhancement between successive stellar generations in a GC. Our approach also has an impact on the evolution of clusters and thus considers the possible loss of stars through evaporation, tidal interactions and stellar evolution. We focus on the present mass ratio between consecutive stellar generations (M(j-1)G/M((j))G) and the present total mass of GGCs (M-GC). Such considerations suffice to determine the relative proportion of stars of consecutive generations that remain today in globular clusters (alpha((j-1)G)/alpha((j))G). The latter is also shown to directly depend on the values of Delta Y and thus the He enhancement between consecutive stellar generations in GGC places major constraints on models of star formation and evolution of GC.

Název v anglickém jazyce

On the Star Formation Efficiencies and Evolution of Multiple Stellar Generations in Globular Clusters

Popis výsledku anglicky

By adopting empirical estimates of the helium enhancement (AY) between consecutive stellar generations for a sample of Galactic globular clusters (GGCs), we uniquely constraint the star formation efficiency (epsilon) of each stellar generation in these stellar systems. In our approach, the star formation efficiency (epsilon) is the central factor that links stellar generations as it defines both their stellar mass and the remaining mass available for further star formation, fixing also the amount of matter required to contaminate the next stellar generation. In this way, epsilon is here shown to be fully defined by the He enhancement between successive stellar generations in a GC. Our approach also has an impact on the evolution of clusters and thus considers the possible loss of stars through evaporation, tidal interactions and stellar evolution. We focus on the present mass ratio between consecutive stellar generations (M(j-1)G/M((j))G) and the present total mass of GGCs (M-GC). Such considerations suffice to determine the relative proportion of stars of consecutive generations that remain today in globular clusters (alpha((j-1)G)/alpha((j))G). The latter is also shown to directly depend on the values of Delta Y and thus the He enhancement between consecutive stellar generations in GGC places major constraints on models of star formation and evolution of GC.

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/GA19-15008S" target="_blank" >GA19-15008S: Efektivita tvorby hvězd v hmotných hvězdokupách</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

1538-4357

e-ISSN

—

Svazek periodika

879

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

58

Kód UT WoS článku

000474384700003

EID výsledku v databázi Scopus

2-s2.0-85069521903