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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2020
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=57171642002 https://www.redalyc.org/journal/571/57171642002/ https://www.redalyc.org/journal/571/57171642002/html/ https://www.redalyc.org/journal/571/57171642002/57171642002.epub https://www.redalyc.org/journal/571/57171642002/movil |
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- Further Properties of the Dynamical Clock A+ Indicator in a Toy Model of Pure Dynamical Friction M. Pasquato Física, Astronomía y Matemáticas Blue stragglers methods: analytical globular clusters: general The Alessandrini A+ indicator is a measure of star cluster dynamical evolution based on the mass-segregation of blue straggler stars. A+ is defined as the integral of the cumulative distribution of blue stragglers over log radius, minus a term related to the reference population used. In a companion paper I introduced a model of dynamical friction and calculated the A+ indicator analytically. Here I show further properties of the time evolution of A+, focusing on the physical interpretation of its time derivative dA+/dt. I find that dA+/dt is the mean of the reciprocal dyamical friction timescale, weighted by the density of blue stragglers. I show that it is non-negative (as expected based on monotonicity) due to the density of blue-stragglers being non-negative and that, for a radially non-decreasing dynamical friction timescale, dA+/dt is also non-decreasing with time, making A+ a convex function. 2020 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57171642002 https://www.redalyc.org/journal/571/57171642002/ https://www.redalyc.org/journal/571/57171642002/html/ https://www.redalyc.org/journal/571/57171642002/57171642002.epub https://www.redalyc.org/journal/571/57171642002/movil 10.22201/ia.01851101p.2020.56.01.02 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.56