G2C2-IV.A novel approach to study the radial distributions of multiple populations in Galactic globular clusters - UTU Tutkimustietojärjestelmä

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G2C2-IV.A novel approach to study the radial distributions of multiple populations in Galactic globular clusters

Tekijät: Vanderbeke J, De Propris R, De Rijcke S, Baes M, West M, Alonso-Garcia J, Kunder A

Kustantaja: OXFORD UNIV PRESS

Julkaisuvuosi: 2015

Journal: Monthly Notices of the Royal Astronomical Society

Tietokannassa oleva lehden nimi: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Lehden akronyymi: MON NOT R ASTRON SOC

Vuosikerta: 451

Numero: 1

Aloitussivu: 275

Lopetussivu: 281

Sivujen määrä: 7

ISSN: 0035-8711

DOI: https://doi.org/10.1093/mnras/stv928

Tiivistelmä

We use the horizontal branch (HB) morphology of 48 Galactic globular clusters (GCs) to study the radial distributions of the different stellar populations known to exist in GCs. Assuming that the (extremely) blue HB stars correspond to stars enriched in helium and light elements, we compare the radial distributions of stars selected according to colour on the HB to trace the distribution of the secondary stellar populations in GCs. Unlike other cases, our data show that the populations are well mixed in 80 per cent of the cases studied. This provides some constraints on the mechanisms proposed to pollute the interstellar medium in young GCs.