Water in star-forming regions withHerschel(WISH)(Corrigendum)

Water in star- and planet-forming regions.

In this paper, we discuss the astronomical search for water vapour in order to understand the disposition of water in all its phases throughout the processes of star and planet formation. Our ability to detect and study water vapour has recently received a tremendous boost with the successful launch and operation of the Herschel Space Observatory. Herschel spectroscopic detections of numerous t...

Age spreads in star forming regions?

Abstract. Rotation periods and projected equatorial velocities of pre-main-sequence (PMS) stars in star forming regions can be combined to give projected stellar radii. Assuming random axial orientation, a Monte-Carlo model is used to illustrate that distributions of projected stellar radii are very sensitive to ages and age dispersions between 1 and 10Myr which, unlike age estimates from conve...

Chemical processes in star forming regions

This paper will review the basic concepts of gas–phase and grain surface chemistry of dense molecular clouds, where low mass and high mass stars form. The chemistry of cold pre-stellar cloud cores, where molecular freezeout and deuterium fractionation dominate, will be presented. Then, following cloud evolution after protostellar birth, hot core and shock chemistry will be discussed in view of ...

Hypersonic Molecular Shocks in Star Forming Regions

Shocks are everywhere in the Universe, and with hindsight it is easy to see why. In the John Dyson era one might be tempted to ask if indeed there is anything else? Such a coherent view of so much of the goings-on between the stars has been imparted by John and his colleagues that most interesting phenomena now have a Dyson – or Dyson-style – similarity solution to describe them. But the discov...

Observations of Infall in Star-forming Regions