Dynamical evolution and spectral characteristics of the stellar group Mamajek 2

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dc.creatorJilinski, E.
dc.creatorOrtega, V. G.
dc.creatorde la Reza, R.
dc.creatorDrake, N. A.
dc.creatorBazzanella, B.
dc.date2008-10-07
dc.date.accessioned2026-07-07T10:08:07Z
dc.date.available2026-07-07T10:08:07Z
dc.descriptionThe dynamical evolution of the recently detected stellar group Mamajek 2 is studied by means of its past 3D orbit. The past orbits of the open clusters NGC 2516 and $α$ Persei, belonging to the so-called "Local Association", were also computed in order to check for a possible common past dynamical evolution of these systems. To complete the data of the Mamajek 2 small group, we have obtained high resolution FEROS spectra to measure the radial and also the projected rotational velocities of its members; an estimate of its metallicity was obtained as well. Two exceptionally low rotating A-type stars turned out to be a strong magnetic Ap star in one case, and a normal A0 star with near-solar metallicity in the other. The dynamical results showed that NGC 2516 and Mamajek 2 may have had a common origin at the age of 135 $\pm$ 5 Myr. This dynamical age confirms the individual ages of 140 Myr for NGC 2516 and 120 $\pm$ 25 Myr for Mamajek 2 obtained independently by photometric methods. Both these groups appear to have the same solar metallicity giving support to a common birth scenario. The dynamical approach is showing that some bound open clusters can form in a coeval fashion with unbound stellar groups or with associations.
dc.identifierhttps://arxiv.org/abs/0810.1198
dc.identifierhttp://arxiv.org/abs/0810.1198
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/170883
dc.subjectAstrophysics
dc.titleDynamical evolution and spectral characteristics of the stellar group Mamajek 2
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