J. E. Drew
A5069650611- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- History and Developments in Astronomy
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Atomic and Molecular Physics
- Astrophysics and Cosmic Phenomena
- Calibration and Measurement Techniques
- Ionosphere and magnetosphere dynamics
- Particle Accelerators and Free-Electron Lasers
- Molecular Spectroscopy and Structure
- Advanced Chemical Physics Studies
- Space Exploration and Technology
- X-ray Spectroscopy and Fluorescence Analysis
- Adaptive optics and wavefront sensing
University College London
1978-2024
University of Hertfordshire
2014-2023
University of Oxford
1988-2020
Rutherford Appleton Laboratory
2018-2020
NASA Research Park
2019
Breakthrough
2019
Galaxies, Etoiles, Physique et Instrumentation
2018
Astronomy and Space
2008-2016
Ames Research Center
2015
Imperial College London
2001-2011
The UKIDSS Galactic Plane Survey (GPS) is one of the five near infrared Public Legacy Surveys that are being undertaken by consortium, using Wide Field Camera on United Kingdom Infrared Telescope. It surveying 1868 sq.deg. northern and equatorial plane at latitudes -5<b></b>
The INT Photometric Halpha Survey of the Northern Galactic Plane (IPHAS) is a 1800 square degrees CCD survey northern Milky Way spanning latitude range -5 < b +5 (degrees) and reaching down to r' ~ 20 (10-sigma). It may increase number known emission line sources by an order magnitude. Representative observations assessment point-source data from IPHAS, now underway, are presented. obtained Wide Field Camera images in narrow-band, Sloan i' broad-band, filters. We simulate IPHAS (r' -...
Context. The ESO public survey VISTA variables in the Vía Láctea (VVV) started 2010. VVV targets 562 sq. deg Galactic bulge and an adjacent plane region is expected to run for about five years.
The VST Photometric Halpha Survey of the Southern Galactic Plane and Bulge (VPHAS+) is surveying southern Milky Way in u, g, r, i at 1 arcsec angular resolution. Its footprint spans latitude range -5 < b +5 all longitudes south celestial equator. Extensions around Centre to latitudes +/-10 bring much Bulge. This ESO public survey, begun on 28th December 2011, reaches down 20th magnitude (10-sigma) will provide single-epoch digital optical photometry for 300 million stars. observing strategy...
The Gaia-ESO Survey is obtaining high-quality spectroscopic data for about 10^5 stars using FLAMES at the VLT. UVES high-resolution spectra are being collected 5000 FGK-type stars. These analyzed in parallel by several state-of-the-art methodologies. Our aim to present how these analyses were implemented, discuss their results, and describe a final recommended parameter scale defined. We also precision (method-to-method dispersion) accuracy (biases with respect reference values) of...
In the last 15 years different ground-based spectroscopic surveys have been started (and completed) with general aim of delivering stellar parameters and elemental abundances for large samples Galactic stars, complementing Gaia astrometry. Among those surveys, Gaia-ESO Public Spectroscopic Survey (GES), only one performed on a 8m class telescope, was designed to target 100,000 stars using FLAMES ESO VLT (both Giraffe UVES spectrographs), covering all Milky Way populations, special focus open...
WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for William Herschel Telescope, will see first light in late 2022. WEAVE comprises a 2-degree field-of-view prime-focus corrector system, nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and single large IFU. These systems feed dual-beam spectrograph covering wavelength range 366$-$959\,nm at $R\sim5000$, or two shorter ranges $R\sim20\,000$. After summarising...
Context. The Gaia-ESO Public Spectroscopic Survey is an ambitious project designed to obtain astrophysical parameters and elemental abundances for 100 000 stars, including large representative samples of the stellar populations in Galaxy, a well-defined sample 60 (plus 20 archive) open clusters. We provide internally consistent results calibrated on benchmark stars star clusters, extending across very wide range ages. This provides legacy data set intrinsic value, equally wide-ranging...
The UK Schmidt Telescope (UKST) of the Anglo-Australian Observatory completed a narrow-band Hα plus [N ii] 6548, 6584-Å survey Southern Galactic Plane and Magellanic Clouds in late 2003. survey, which was last UKST wide-field photographic only one undertaken narrow-band, is now an online digital data product Wide-Field Astronomy Unit Royal Edinburgh (ROE). utilized high specification, monolithic interference bandpass filter exceptional quality. In conjunction with fine-grained Tech-Pan film...
The INT/WFC Photometric H-Alpha Survey of the Northern Galactic Plane (IPHAS) is a 1800 square degrees imaging survey covering latitudes |b| < 5 deg and longitudes l = 30 to 215 in r, i H-alpha filters using Wide Field Camera (WFC) on 2.5-metre Isaac Newton Telescope (INT) La Palma. We present first quality-controlled globally-calibrated source catalogue derived from survey, providing single-epoch photometry for 219 million unique sources across 92% footprint. observations were carried out...
We present VIRAC version 1, a near-infrared proper motion and parallax catalogue of the VISTA VVV survey for 312,587,642 unique sources averaged across all overlapping pawprint tile images covering 560 deg$^2$ bulge Milky Way southern disk. The includes 119 million high quality measurements, which 47 have statistical uncertainties below 1 mas yr$^{-1}$. In 11$<K_s<$14 magnitude range motions median uncertainty 0.67 also 6,935 with quality-controlled 5 $\sigma$ parallaxes 1.1 mas. show...
We have compiled a significantly updated and comprehensive census of massive stars in the nearby Cygnus OB2 association by gathering homogenizing data from across literature. The contains 169 primary OB stars, including 52 O-type 3 Wolf–Rayet stars. Spectral types photometry are used to place Hertzsprung–Russell diagram, which is compared both non-rotating rotating stellar evolution models, masses ages calculated. star formation history mass function assessed, found be heavily influenced...
We study the 2-D, time-dependent hydrodynamics of radiation-driven winds from accretion disks in which radiation force is mediated by spectral lines. If dominant contribution to total field comes disk, then we find outflow intrinsically unsteady and characterised large amplitude velocity density changes. Both infall can occur different regions wind at same time. On other hand, if luminosity system dominated central star, steady. In either case, 2-D structure consists a dense, slow outflow,...
We present Hα spectropolarimetry observations of a sample 23 Herbig Ae/Be stars. A change in the linear polarization across is detected large fraction objects, which indicates that regions around stars are flattened (disc-like) on small scales. second outcome our study spectropolarimetric signatures for Ae differ from those Be stars, with characteristics changing depolarization to line polarizations group. The frequency depolarizations (seven out 12) particularly interesting as, by analogy...
Cygnus OB2 is the nearest example of a massive star-forming region (SFR), containing over 50 O-type stars and hundreds B-type stars. We have analyzed properties young in two fields Cyg using recently published deep catalog Chandra X-ray point sources with complementary optical near-IR photometry. Our sample complete to ∼1 M☉ (excluding A- that do not emit X-rays), making this deepest study stellar star formation history date. From Siess et al. isochrone fits color–magnitude diagram, we...
We present a three dimensional map of extinction in the Northern Galactic Plane derived using photometry from IPHAS survey. The has fine angular ($\sim 10$ arcmin) and distance (100 pc) sampling allied to significant depth ($\gtrsim 5$ kpc). construct method based on hierarchical Bayesian model as previously described by Sale (2012). In addition mean extinction, we also measure differential which arises fractal nature ISM, show that it will be dominant source uncertainty estimates some...
The Isaac Newton Telescope (INT) Photometric H-Alpha Survey (IPHAS) is a 1800 deg2 survey of the Northern Galactic Plane, reaching down to r′∼ 21. We demonstrate how can be used (1) reliably select classical T Tauri star candidates and (2) constrain mass accretion rates with an estimated relative uncertainty 0.6 dex. IPHAS necessary addition spectroscopic surveys because it allows large uniform samples obtained precise handle on selection effects.
This paper describes the first data release of Kepler-INT Survey (KIS) that covers a 116 deg2 region Cygnus and Lyra constellations. The Kepler field is target most intensive search for transiting planets to date. Despite fact mission provides superior time-series photometry, with an enormous impact on all areas stellar variability, its lacks optical photometry complete confusion limit instrument necessary selecting various classes targets. For this reason, we follow observing strategy...
The Gaia-ESO Survey is a large public spectroscopic survey that aims to derive radial velocities and fundamental parameters of about 10^5 Milky Way stars in the field clusters. Observations are carried out with multi-object optical spectrograph FLAMES, using simultaneously medium resolution (R~20,000) GIRAFFE high (R~47,000) UVES spectrograph. In this paper, we describe methods software used for data reduction, derivation velocities, quality control FLAMES-UVES spectra. Data reduction has...
We present a high-precision proper motion study of 873 X-ray and spectroscopically selected stars in the massive OB association Cygnus OB2 as part DANCe project. These were calculated from images spanning 15 yr baseline have typical precisions <1 mas yr−1. calculate velocity dispersion two axes to be |$\sigma _\alpha (c) = 13.0^{+0.8}_{-0.7}$| _\delta 9.1^{+0.5}_{-0.5}$| km s−1, using two-component, two-dimensional model that takes into account uncertainties on measurements. This gives...
Context. Chemically inhomogeneous populations are observed in most globular clusters, but not open clusters. Cluster mass seems to play a key role the existence of multiple populations.
As part of the Accretion Discs in H$\alpha$ with OmegaCAM (ADHOC) survey, we imaged r, i and H-alpha a region 12x8 square degrees around Orion Nebula Cluster. Thanks to high-quality photometry obtained, discovered three well-separated pre-main sequences color-magnitude diagram. The populations are all concentrated towards cluster's center. Although several explanations can be invoked explain these left two competitive, but intriguing, scenarios: population unresolved binaries an exotic mass...
The Gaia-ESO survey (GES) is now in its fifth and last year of observations, has already produced tens thousands high-quality spectra stars all Milky Way components. This paper presents the strategy behind selection astrophysical calibration targets, ensuring that GES results on radial velocities, atmospheric parameters, chemical abundance ratios will be both internally consistent easily comparable with other literature results, especially from large spectroscopic surveys Gaia. particularly...