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Verfasst von:Cabrera-Ziri, Ivan [VerfasserIn]   i
 Conroy, Charlie [VerfasserIn]   i
Titel:Deriving ages and horizontal branch properties of integrated stellar populations
Verf.angabe:Ivan Cabrera-Ziri and Charlie Conroy
E-Jahr:2022
Jahr:2022 January 12
Umfang:15 S.
Fussnoten:Gesehen am 21.04.2022
Titel Quelle:Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
Ort Quelle:Oxford : Oxford Univ. Press, 1827
Jahr Quelle:2022
Band/Heft Quelle:511(2022), 1, Seite 341-355
ISSN Quelle:1365-2966
Abstract:A major source of uncertainty in the age determination of old (∼10 Gyr) integrated stellar populations is the presence of hot horizontal branch (HB) stars. Here, we describe a simple approach to tackle this problem, and show the performance of this technique that simultaneously models the age, abundances, and HB properties of integrated stellar populations. For this, we compare the results found during the fits of the integrated spectra of a sample of stellar population benchmarks, against the values obtained from the analysis of their resolved colour-magnitude diagrams (CMDs). We find that the ages derived from our spectral fits for most (26/32) of our targets are within 0.1 dex to their CMDs values. Similarly, for the majority of the targets in our sample we are able to recover successfully the flux contribution from hot HB stars (within ∼0.15 dex for 18/24 targets) and their mean temperature (14/24 targets within $\sim 30 {{\ \rm per\ cent}}$). Finally, we present a diagnostic that can be used to detect spurious solutions in age, that will help identify the few cases when this method fails. These results open a new window for the detailed study of globular clusters beyond the Local Group.
DOI:doi:10.1093/mnras/stac012
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1093/mnras/stac012
 DOI: https://doi.org/10.1093/mnras/stac012
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1799516148
Verknüpfungen:→ Zeitschrift

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