The Effect of Age on the Grouping of Open Clusters : the Primordial Group Hypothesis
Casado Giménez, Juan (Universitat Autònoma de Barcelona. Departament de Química)

Fecha:	2022
Resumen:	The Primordial Group hypothesis states that only sufficiently young open clusters (OCs) can be multiple, and old OCs are essentially isolated. We tested this postulate through four different studies using a manual search of Gaia EDR3 and extensive literature. First, we revisited the work of de La Fuente Marcos and de La Fuente Marcos (2009), which states that only ca. 40% of OC pairs are of primordial origin. However, no plausible binary system among their proposed OC pairs having at least one member older than 0. 1 Gyr was found. Second, we researched the OCs 4 Gyr) showed that they are essentially alone. Forth, the well-known case of the double cluster in Perseus and some other binary systems described in the literature were also shown to accommodate the title hypothesis. A simplified bimodal model allows for retrieval of the overall fraction of related OCs (approximately 12-16%) from our results, assuming that young clusters remain associated at ~0. 04 Gyr. The obtained results further support that OCs are born in groups (Casado 2021).
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Open cluster pairs ; Open cluster groups ; Open cluster formation ; Gaia ; Manual search ; Primordial Group hypothesis
Publicado en:	Universe, Vol. 8, Issue 2 (February 2022) , art. 113, ISSN 2218-1997

DOI: 10.3390/universe8020113

24 p, 1.6 MB

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