Outputs (17)

OB associations and their origins (2020)
Journal Article

OB associations are unbound groups of young stars made prominent by their bright OB members, and have long been thought to be the expanded remnants of dense star clusters. They have been important in astrophysics for over a century thanks to their lu... Read More about OB associations and their origins.

The Kinematics of the Scorpius-Centaurus OB Association from Gaia DR1 (2018)
Journal Article

We present a kinematic study of the Scorpius-Centaurus (Sco-Cen) OB association (Sco OB2) using Gaia DR1 parallaxes and proper motions. Our goal is to test the classical theory that OB associations are the expanded remnants of dense and compact star... Read More about The Kinematics of the Scorpius-Centaurus OB Association from Gaia DR1.

Solar-type dynamo behaviour in fully convective stars without a tachocline. (2016)
Journal Article

In solar-type stars (with radiative cores and convective envelopes like our Sun), the magnetic field powers star spots, flares and other solar phenomena, as well as chromospheric and coronal emission at ultraviolet to X-ray wavelengths. The dynamo re... Read More about Solar-type dynamo behaviour in fully convective stars without a tachocline..

SXP 214: An X-ray Pulsar In The Small Magellanic Cloud, Crossing The Circumstellar Disk Of The Companion (2016)
Journal Article

Located in the Small Magellanic Cloud (SMC), SXP 214 is an X-ray pulsar in a high mass X-ray binary system with a Be-star companion. A recent survey of the SMC under a Chandra X-ray Visionary program found that the source was in a transition when the... Read More about SXP 214: An X-ray Pulsar In The Small Magellanic Cloud, Crossing The Circumstellar Disk Of The Companion.

The Gaia-ESO Survey: Dynamical analysis of the L1688 region in Ophiuchus (2016)
Journal Article

The Gaia ESO Public Spectroscopic Survey (GES) is providing the astronomical community with high-precision measurements of many stellar parameters including radial velocities (RVs) of stars belonging to several young clusters and star-forming regions... Read More about The Gaia-ESO Survey: Dynamical analysis of the L1688 region in Ophiuchus.

Dynamical evolution of star forming regions - II. Basic kinematics (2016)
Journal Article

We follow the dynamical evolution of young star-forming regions with a wide range of initial conditions and examine how the radial velocity dispersion, $\sigma$, evolves over time. We compare this velocity dispersion to the theoretically expected val... Read More about Dynamical evolution of star forming regions - II. Basic kinematics.

The Kinematics of Star Formation: Theory and Observation in the Gaia Era (Published title 'Star Formation in the Gaia Era') (2016)
Journal Article

The European Space Agency's Gaia space telescope, launched in 2013, aims to measure the positions, parallaxes, and proper motions of a billion stars in our Galaxy and throughout the Local Group. In doing so it will include hundreds of thousands of yo... Read More about The Kinematics of Star Formation: Theory and Observation in the Gaia Era (Published title 'Star Formation in the Gaia Era').

X-ray emission from massive stars in CYG OB2 (2015)
Journal Article

We report on the analysis of the Chandra-ACIS data of O, B, and WR stars in the young association Cyg OB2. X-ray spectra of 49 O-stars, 54 B-stars, and 3 WR-stars are analyzed and for the brighter sources, the epoch dependence of the X-ray fluxes is... Read More about X-ray emission from massive stars in CYG OB2.

The Massive Star Population of Cygnus OB2 (2015)
Journal Article

We have compiled a significantly updated and comprehensive census of massive stars in the nearby Cygnus OB2 association by gathering and homogenizing data from across the literature. The census contains 169 primary OB stars, including 52 O-type stars... Read More about The Massive Star Population of Cygnus OB2.

A 3D extinction map of the northern Galactic plane based on IPHAS photometry (2014)
Journal Article

We present a 3D map of extinction in the northern Galactic plane derived using photometry from the INT/WFC Photometric Ha Survey of the northern Galactic plane. The map has fine angular (~10 arcmin) and distance (100 pc) sampling allied to a signific... Read More about A 3D extinction map of the northern Galactic plane based on IPHAS photometry.