Young Stellar Groups and Their Most Massive Stars

Abstract

We analyze the masses and spatial distributions of fourteen young stellar groups in Taurus, Lupus3, ChaI, and IC348. These nearby groups, which typically contain 20 to 40 members, have membership catalogs complete to ~0.02 M_sun, and are sufficiently young that their locations should be similar to where they formed. These groups show five properties seen in clusters having many more stars and much greater surface density of stars: (1) a broad range of masses, (2) a concentration of the most massive star towards the centre of the group, (3) an association of the most massive star with a high surface density of lower-mass stars, (4) a correlation of the mass of the most massive star with the total mass of the group, and (5) the distribution of a large fraction of the mass in a small fraction of the stars.

Accepted for publication in ApJ. 78 pages preprint format, 16 figures & 2 tables, plus supplementary 3 figures & 4 tables for the online version only

References in corpus (17)

• A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis
• Structural Analysis of Molecular Clouds: Dendrograms
• Filamentary structure of star-forming complexes
• The Spatial Distribution of Star Formation in the Solar Neighbourhood: Do all stars form in clusters?
• The Stellar Population of the Chamaeleon I Star-Forming Region
• Dynamical mass segregation on a very short timescale
• Equilibrium Star Cluster Formation
• The Disk Population of the Chamaeleon I Star-Forming Region
• A Spitzer census of the IC 348 nebula
• The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. XI. Lupus Observed With IRAC and MIPS
• Variations in Stellar Clustering with Environment: Dispersed Star Formation and the Origin of Faint Fuzzies
• Current Star Formation in the Ophiuchus and Perseus Molecular Clouds: Constraints and Comparisons from Unbiased Submillimeter and Mid-Infrared Surveys. II
• The secrets of the nearest starburst cluster: II. The present-day mass function in NGC 3603
• The Structure of Molecular Clouds: I - All Sky Near Infrared Extinction Maps
• New Low-Mass Stars and Brown Dwarfs with Disks in the Chamaeleon I Star-Forming Region
• No evidence for mass segregation in massive young clusters
• A large scale extinction map of the Galactic Anticenter from 2MASS

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