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Article
Optical spectroscopic classification of 35 hard X-ray sources from the Swift-BAT 70-month catalogue
The nature of a substantial percentage (about one fifth) of hard X-ray sources discovered with the BAT instrument onboard the Neil Gehrels Swift Observatory (hereafter Swift) is unknown because of the lack of an ...
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Article
Open AccessCould shared decision making affect staying in hospital? A cross-sectional pilot study
Shared Decision Making (SDM) is an approach where clinicians and patients share the best available evidence to make decision and where patients opinions are considered. This approach provides benefits for pati...
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Article
Establishing the Galactic Centre distance using VVV Bulge RR Lyrae variables
This study’s objective was to exploit infrared VVV (VISTA Variables in the Via Lactea) photometry for high latitude RRab stars to establish an accurate Galactic Centre distance. RRab candidates were discovered...
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Article
Anchors for the cosmic distance scale: the Cepheid QZ Normae in the open cluster NGC 6067
Cepheids are key to establishing the cosmic distance scale. Therefore it’s important to assess the viability of QZ Nor, V340 Nor, and GU Nor as calibrators for Leavitt’s law via their purported membership in t...
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Article
An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent
Observations of eight long-period, late-type eclipsing-binary systems composed of cool, giant stars are used to determine a distance to the Large Magellanic Cloud accurate to 2.2 per cent, providing a base for...
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Chapter
The VISTA Variables in the Vía Láctea Survey: A First Glance on Stellar Variability
VISTA Variables in the Vía Láctea (VVV) is an ESO public near-infrared variability survey of the Galactic bulge and an adjacent area of the southern mid-plane. It will produce a deep atlas in the ZYJHKs filters, ...
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Article
Rest et al. reply
Replying to K. Davidson & R. M. Humphreys Nature486,http://dx.doi.org/10.1038/nature11166(2012).
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Article
Light echoes reveal an unexpectedly cool η Carinae during its nineteenth-century Great Eruption
Light echoes from the massive binary star η Carinae reveal it to have been much cooler than models suggest during its Great Eruption in 1840 but the cause of the eruption remains unknown.
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Chapter and Conference Paper
Simulations of Star Counts and Galaxies Towards Vista Variables in the via Láctea Survey Region
In the present work, we present results of simulations for star and galaxy counts using a Galaxy and Large-Scale Structure Model (respectively) towards the VVV survey region. In total there are around 3 billio...
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Article
The dynamical mass of a classical Cepheid variable star in an eclipsing binary system
Cepheid variable stars have been important in the development of modern astrophysics through their use in establishing cosmic distances, but despite extensive research they retain some of their mysteries. One ...
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Chapter and Conference Paper
HST Photometry of the Binary Globular Cluster Sersic 13N-S in NGC5128[1]
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Chapter and Conference Paper
Metal-Poor Globular Clusters of the Galactic Bulge
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Chapter and Conference Paper
Spectroscopic Abundances and Radial Velocities of the Galactic Globular Clusters 2MASS GC01 and 2MASS GC02: Preliminary Results
We have presented the preliminary results of the first spectroscopic observations of the galactic globular clusters 2MASS GC01 and 2MASS GC02. The metallicity, radial velocities and distances to the clusters a...
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Chapter and Conference Paper
Exploring the Time Axis—High Resolution Timing Observations with Present and Future Instrumentation
The technological advances and the increase of the collecting are of the modern telescopes made it feasible to obtain high signal-to-noise (S/N) observations of “fast” phenomena, which was not possible earlier...
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Chapter and Conference Paper
Properties of RR Lyrae Stars in the Inner Regions of the Large Magellanic Cloud. II. The Extended Sample
Using low-resolution spectroscopy with FORS1,FORS2 and GEMINI-GMOS we have obtained good quality spectra for 99 LMC RR Lyrae, of which 86 are in the field and 13 in the clusters NGC1835 and NGC2019. 15 RR Lyra...
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Chapter and Conference Paper
Abundances in the Galactic Bulge
A review is presented on abundance determinations in stars of the Galactic bulge, both in the field and in globular clusters. Previous low-resolution spectroscopy results are revised. Recent high resolution an...
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Article
Old stellar populations in NGC 5128
We have resolved the stars in the halo and in the diffuse northeastern shell of the nearest giant elliptical galaxy NGC 5128 using VLT with FORS1 and ISAAC. Dominating feature in the optical-near IR color-magn...
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Chapter
Old Stellar Populations in NGC 5128
We have resolved the stars in the halo and in the diffuse northeastern shell of the nearest giant elliptical galaxy NGC 5128 using VLT with FORS1 and ISAAC. Dominating feature in the optical-near IR color-magn...
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Article
Direct detection of a microlens in the Milky Way
The nature of dark matter remains mysterious, with luminous material accounting for at most ∼25 per cent of the baryons in the Universe1,2. We accordingly undertook a survey looking for the microlensing of stars ...
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Chapter and Conference Paper
The MACHO Project 5.7 Year LMC Results
The MACHO collaboration has analyzed 5.7years of photometry on approximately 11.7 million stars in the Large Magellanic Cloud (LMC) in a search for gravitational microlensing events. Two sets of cuts were used...
