Our objective is to understand Low Mass star formation in our galaxy.
We study optically visible pre-main sequence (PMS) stars (T Tauri
stars, TTS), and embedded objects in cores (protostars),
all of approximately solar mass, which together we designate as Young Stellar Objects
(YSOs). We are also interested in assessing the potential of these objects to form
associated planets. Photometric observations define the spectral energy distributions and
the luminosities. Low resolution IR spectroscopy of silicate, solid CO and water ice
features indicate the amount of obscuring material at various temperatures and the thermal
history of the grains. IR imaging and imaging polarimetry can reveal: the structure of the
objects; local extinction gradients; grain size; orientation and properties of any discs
and wind blown cavities; whether the stars are binary, and how binaries affect discs.
Submillimetre photometry and mapping seeks the presence of disks and probes the structure
of envelopes whilst submillimetre polarimetry aims to determine the magnetic field
direction in disks. High resolution optical and IR spectroscopy determines magnetic fields
on TTS and reveals the profiles of the IR H recombination lines, probing the accretion
onto TTS. Time series analysis allows us to investigate flares and the rotation of
magnetic structures. We interpret our data within theoretical scenarios in which rotation,
accretion and magnetic fields are all important. In particular, we determine the role of
discs, envelopes and magnetic fields around YSOs and deduce physical properties such as
the distribution of mass and temperature with radius, the size of dust grains, and the
magnitude and role of magnetic fields in regulating the accretion mechanism onto the
objects.
For further details on the T Tauri stars or the
embedded objects in cores or the groups future
plans click on those words.
There are lists of the Group's Refereed
and Conference publications (some papers are
downloadable) .
