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Intrinsic Color Indices of Stars Obtained from 2MASS Photometry

Wegner W.

Acta Astronomica

2014

Vol. 64, No. 3

261--275

This paper is based on JHKs magnitudes of 8 842 different spectral types stars obtained from 2MASS photometry. The mean intrinsic colors have been derived with the aid of two-color diagrams for stars of luminosity classes I-II, III and IV-V. The present results are based on samples of every Sp/L, reasonably larger than any other previously used for determining infrared colors. The smoothed infrared colors are compared with those obtained by other authors. Examples of several two-color diagrams and plots of the observed and smoothed intrinsic colors vs. spectral types of luminosity classes I-II, III and IV-V are presented. Generally the newly determined infrared intrinsic colors (V-J)0, (V-H)0 and (V-Ks)0 differ significantly from those available in literature.

Open Clusters in 2MASS Photometry. II. Mass Function and Mass Segregation

Bukowiecki Ł., Maciejewski G., Konorski P., Niedzielski A.

Acta Astronomica

2012

Vol. 62, No. 3

281--296

This is a continuation of our study of open clusters based on the 2-Micron All Sky Survey photometry. Here we present the results of the mass function analysis for 599 known open clusters in the Milky Way. The main goal of this project is a study of the dynamical state of open clusters, the mass segregation effect and an estimate of the total mass and the number of cluster members. We noticed that the cluster size (core and overall radii) decreases along dynamical evolution of clusters. The cluster cores evolve faster than the halo regions and contain proportionally less low-mass stars from the beginning of the cluster dynamical evolution. We also noticed, that the star density decreases for the larger clusters. Finally, we found an empirical relation describing the exponential decrease of the mass function slope with the dynamical evolution of clusters.