Highlights - 26 March 2010 (vol. 512)

HIGHLIGHTS: this week in A&A

26 March 2010 (vol. 512)


In section 8. Stellar atmospheres

“Mass fluxes for hot stars”, by L.B. Lucy, A&A 512, A33

Understanding of hot star winds is currently challenged by two fundamental realizations: the winds are strongly affected by inhomogeneities and observed mass loss rates appear to be far below the predictions for late-type O dwarfs. Through selfconsistent hydrodynamic models, this paper identifies a weak-wind regime, which roughly matches the observed one. Although the predicted mass-loss rates are still too high, this approach may pave the way towards resolving the issue.


In section 6. Interstellar and circumstellar matter

“Toward understanding the formation of multiple systems. A pilot IRAM-PdBI survey of Class 0 objects”, by A. J. Maury, Ph. Andre, P. Hennebelle, F. Motte, D. Stamatellos, M. Bate, A. Belloche, G. Duchene, and A.Whitworth, A&A 512, A40

Young solar-type pre-main sequence stars are often binary, so one of the challenges for those who model protostar is to predict the binary fraction (or in more general multiplicity) and its dependence on mass. One constraint on these models is the binary fraction in the earliest phases of protostellar evolution when the envelope is still accreting (the Class 0 phase). In the article highlighted here, Maury et al. use Plateau de Bure mm interferometric observations of 5 nearby Class 0 systems to put limits on the binary fraction. After combining their results with earlier work, they tentatively conclude that the binary fraction may initially be small.


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© Astronomy & Astrophysics 2010