Topic
Mass segregation
About: Mass segregation is a research topic. Over the lifetime, 1024 publications have been published within this topic receiving 57729 citations.
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TL;DR: In this paper, a detailed open cluster survey with LAMOST (LAMOST Open Cluster Survey) has been proposed, based on the most complete open clusters sample with metallicity, age and distance data as well as kinematic information.
Abstract: We review our work on Galactic open clusters in recent years, and introduce our proposed large program for the LOCS (LAMOST Open Cluster Survey). First, based on the most complete open clusters sample with metallicity, age and distance data as well as kinematic information, some preliminary statistical analysis regarding the spatial and metallicity distributions is presented. In particular, a radial abundance gradient of - 0.058$\pm$ 0.006 dex kpc$^{-1}$ was derived, and by dividing clusters into age groups we show that the disk abundance gradient was steeper in the past. Secondly, proper motions, membership probabilities, and velocity dispersions of stars in the regions of two very young open clusters are derived. Both clusters show clear evidence of mass segregation, which provides support for the ``primordial'' mass segregation scenarios. Based on the great advantages of the forthcoming LAMOST facility, we have proposed a detailed open cluster survey with LAMOST (the LOCS). The aim, feasibility, and the present development of the LOCS are briefly summarized.
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TL;DR: In this paper, the authors presented deep UBV I and Halpha photometry for the young open cluster IC 1590 in the center of the H II region NGC 281.
Abstract: Young open clusters are ideal laboratories to understand star formation process. We present deep UBV I and Halpha photometry for the young open cluster IC 1590 in the center of the H II region NGC 281. Early-type members are selected from UBV photometric diagrams, and low-mass pre-main sequence (PMS) members are identified by using Halpha photometry. In addition, the published X-ray source list and Gaia astrometric data are also used to isolate probable members. A total of 408 stars are selected as members. The mean reddening obtained from early-type members is 1 M_sun). The signature of mass segregation is detected from the difference in the slopes of the initial mass functions for the inner (r < 2.'5) and outer region of this cluster. We finally discuss the star formation history in NGC 281.
TL;DR: In this paper, simple two-component models based on a distribution function originally conceived to describe elliptical galaxies, recently truncated and adapted to the context of globular clusters, can describe in detail what is observed in complex and realistic numerical simulations.
Abstract: As a result of the slow action of two-body encounters, globular clusters develop mass segregation and attain a condition of only partial energy equipartition even in their central, most relaxed regions. Realistic numerical simulations show that, during the process, a radially-biased anisotropy profile slowly builds up, mimicking that resulting from incomplete violent relaxation. Commonly used dynamical models, such as the one-component King models, cannot describe these properties. Here we show that simple two-component models based on a distribution function originally conceived to describe elliptical galaxies, recently truncated and adapted to the context of globular clusters, can describe in detail what is observed in complex and realistic numerical simulations.
01 Jan 2003
TL;DR: In this paper, a program in C is used to investigate the primordiality of mass segregation in star clusters and conclude that mass segregation takes place and from the comparison with Bonnell and Davies they flnd that it may be primordial.
Abstract: We have written a program in C to investigate the primordiality of mass segregation in star clusters. As integration method we use the time-symmetric leapfrog. From the simulation data we calculate ln⁄ (the coulomb logarithm). The method we use for this is not very precise, but when we compare our result with the ln⁄ Bonnell and Davies have found in a similar study in 1998 [1], we flnd that they are almost exactly the same. From our results we can conclude that mass segregation takes place and from the comparison with Bonnell and Davies we flnd that it may be primordial.
TL;DR: In this paper, the relative proper motions of 872 stars in the open cluster M 11 with epoch differences of 16-70 years taken with a 40 cm double astrograph are determined.