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Do all stars in the solar neighbourhood form in clusters? A cautionary note on the use of the distribution of surface densities

Gieles, M, Moeckel, N and Clarke, CJ (2012) Do all stars in the solar neighbourhood form in clusters? A cautionary note on the use of the distribution of surface densities Mon. Not. R. Astron. Soc. 426, L11-15 (2012).

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Abstract

Bressert et al. recently showed that the surface density distribution of low-mass, young stellar objects (YSOs) in the solar neighbourhood is approximately log-normal. The authors conclude that the star formation process is hierarchical and that only a small fraction of stars form in dense star clusters. Here, we show that the peak and the width of the density distribution are also what follow if all stars form in bound clusters which are not significantly affected by the presence of gas and expand by two-body relaxation. The peak of the surface density distribution is simply obtained from the typical ages (few Myr) and cluster membership number (few hundred) typifying nearby star-forming regions. This result depends weakly on initial cluster sizes, provided that they are sufficiently dense (initial half mass radius of <0.3 pc) for dynamical evolution to be important at an age of a few Myr. We conclude that the degeneracy of the YSO surface density distribution complicates its use as a diagnostic of the stellar formation environment.

Item Type: Article
Authors :
NameEmailORCID
Gieles, Mm.gieles@surrey.ac.ukUNSPECIFIED
Moeckel, NUNSPECIFIEDUNSPECIFIED
Clarke, CJUNSPECIFIEDUNSPECIFIED
Date : 9 July 2012
Identification Number : https://doi.org/10.1111/j.1745-3933.2012.01312.x
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:39
Last Modified : 17 May 2017 15:05
URI: http://epubs.surrey.ac.uk/id/eprint/836242

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