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  • Martocchia, S. (author)

Age as a major factor in the onset of multiple populations in stellar clusters

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2017-10-02
  • Oxford University Press (OUP),2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-153893
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-153893URI
  • https://doi.org/10.1093/mnras/stx2556DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • It is now well established that globular clusters (GCs) exhibit star-to-star light-element abundance variations (known as multiple populations, MPs). Such chemical anomalies have been found in (nearly) all the ancient GCs (more than 10 Gyr old) of our Galaxy and its close companions, but so far no model for the origin of MPs is able to reproduce all the relevant observations. To gain new insights into this phenomenon, we have undertaken a photometric Hubble Space Telescope survey to study clusters with masses comparable to that of old GCs, where MPs have been identified, but with significantly younger ages. Nine clusters in the Magellanic Clouds with ages between similar to 1.5 and 11 Gyr have been targeted in this survey. We confirm the presence of MPs in all clusters older than 6 Gyr and we add NGC 1978 to the group of clusters for which MPs have been identified. With an age of similar to 2 Gyr, NGC 1978 is the youngest cluster known to host chemical abundance spreads found to date. We do not detect evident star-to-star variations for slightly younger massive clusters (similar to 1.7 Gyr), thus pointing towards an unexpected age dependence for the onset of MPs. This discovery suggests that the formation of MPs is not restricted to the early Universe and that GCs and young massive clusters share common formation and evolutionary processes.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Cabrera-Ziri, I. (author)
  • Lardo, C. (author)
  • Dalessandro, E. (author)
  • Bastian, N. (author)
  • Kozhurina-Platais, V. (author)
  • Usher, C. (author)
  • Niederhofer, F. (author)
  • Cordero, M. (author)
  • Geisler, D. (author)
  • Hollyhead, KatherineStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)kathh (author)
  • Kacharov, N. (author)
  • Larsen, S. (author)
  • Li, C. (author)
  • Mackey, D. (author)
  • Hilker, M. (author)
  • Mucciarelli, A. (author)
  • Platais, I. (author)
  • Salaris, M. (author)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)473:2, s. 2688-27000035-87111365-2966

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