Continued Monitoring of LMXBs with the Faulkes Telescopes (2008)
Lewis, Fraser, Russell, David M., Fender, Rob P., Roche, Paul, Clark, J. Simon
The Faulkes Telescope Project is an educational and research arm of the Las Cumbres Observatory Global Telescope Network (LCOGTN). It has two 2-metre robotic telescopes, located at Haleakala on Maui...
Westerlund 1 as a Template for Massive Star Evolution (2008)
Negueruela, Ignacio, Clark, J. Simon, Crowther, Paul A., Hadfield, Lucy
With a dynamical mass M_dyn ~ 1.3x10e5 M_sun and a lower limit M_cl>5x10e4 M_sun from star counts, Westerlund 1 is the most massive young open cluster known in the Galaxy and thus the perfect...
Intermediate to low-mass stellar content of Westerlund 1 (2007)
Brandner, Wolfgang, Clark, J. Simon, Stolte, Andrea, Waters, Rens, Negueruela, Ignacio, Goodwin, Simon P.
We have analysed near-infrared NTT/SofI observations of the starburst cluster Westerlund 1, which is among the most massive young clusters in the Milky Way. A comparison of colour-magnitude diagrams...
Radio observations of the massive stellar cluster Westerlund 1 (2007)
Dougherty, Sean M., Clark, J. Simon
High-dynamic range radio observations of Westerlund 1 are presented that detect a total of 21 stars in the young massive stellar cluster, the richest population of radio emitting stars known for any...
Diffuse, Non-Thermal X-ray Emission from the Galactic Star Cluster Westerlund 1 (2006)
Muno, Michael P., Law, Casey, Clark, J. Simon, Dougherty, Sean M., De Grijs, Richard, Zwart, Simon Portegies, ...
We present the diffuse X-ray emission identified in Chandra observations of the young, massive Galactic star cluster Westerlund 1. After removing point-like X-ray sources down to a completeness limit...
Further Wolf-Rayet stars in the starburst cluster Westerlund 1 (2005)
Negueruela, Ignacio, Clark, J. Simon
We present new low and intermediate-resolution spectroscopic observations of the Wolf Rayet (WR) star population in the massive starburst cluster Westerlund 1. Finding charts are presented for five...
A newly identified Luminous Blue Variable in the galactic starburst cluster Westerlund 1 (2003)
Clark, J. Simon, Negueruela, Ignacio
We present observations of the massive transitional star W243 in Westerlund 1. We find an apparent spectral type of early-mid A from our data, in contrast to an earlier classification of B2I, made...
A hidden population of Wolf-Rayet stars in the massive galactic cluster Westerlund 1 (2002)
Clark, J. Simon, Negueruela, Ignacio
We report the discovery of a hitherto undetected population of Wolf-Rayet stars in the young galactic open cluster Westerlund 1. Optical spectroscopy of the cluster identified 11 such objects;...
The very rich massive post-main-sequence star population of the open cluster Westerlund 1 (2002)
Negueruela, Ignacio, Clark, J. Simon
We report the discovery of a population of Wolf-Rayet stars in the young Galactic open cluster Westerlund 1. In an incomplete shallow spectroscopic survey, we find six nitrogen-rich (WN) and five...