A search for mass segregation of stars and brown dwarfs in ρ Ophiuchi - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2012

A search for mass segregation of stars and brown dwarfs in ρ Ophiuchi

Abstract

We apply two different algorithms to search for mass segregation to a recent observational census of the ρ Ophiuchi star-forming region. First, we apply the ΛMSR method, which compares the minimum spanning tree (MST) of a chosen subset of stars to MSTs of random subsets of stars in the cluster, and determine the mass segregation ratio, ΛMSR. Secondly, we apply the m-Σ method, which calculates the local stellar surface density around each star and determines the statistical significance of the average surface density for a chosen mass bin compared to the average surface density in the whole cluster. Using both methods, we find no indication of mass segregation (normal or inverse) in the spatial distribution of stars and brown dwarfs in ρ Ophiuchi. Although ρ Ophiuchi suffers from high visual extinction, we show that a significant mass segregation signature would be detectable, albeit slightly diluted, despite dust obscuration of centrally located massive stars.
Fichier principal
Vignette du fichier
426-4-3079.pdf (464.56 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03612396 , version 1 (17-03-2022)

Licence

Attribution

Identifiers

Cite

Richard J. Parker, Thomas Maschberger, Catarina Alves de Oliveira. A search for mass segregation of stars and brown dwarfs in ρ Ophiuchi. Monthly Notices of the Royal Astronomical Society, 2012, 426, pp.3079-3085. ⟨10.1111/j.1365-2966.2012.21790.x⟩. ⟨insu-03612396⟩
9 View
7 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More