A5004200001- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Astrophysical Phenomena and Observations
- Astronomical and nuclear sciences
- Cardiac, Anesthesia and Surgical Outcomes
- Adaptive optics and wavefront sensing
- Medical History and Innovations
- History of Medical Practice
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- Orthopedic Surgery and Rehabilitation
- Nuclear physics research studies
- Urological Disorders and Treatments
- Geomagnetism and Paleomagnetism Studies
- SAS software applications and methods
- Geochemistry and Geologic Mapping
- Historical Geography and Cartography
- Musculoskeletal Disorders and Rehabilitation
Australian National University
2016-2025
ARC Centre of Excellence for All-sky Astrophysics
2020-2025
ASTRO-3D
2020-2025
Mount Stromlo Observatory
2010-2019
Laboratório Interinstitucional de e-Astronomia
2018
ACT Government
2014
Universidade Federal do Rio de Janeiro
2013
University of Stuttgart
2012
Purple Mountain Observatory
2007
Australian Astronomical Observatory
1991-2005
The GALAH survey is a large high-resolution spectroscopic using the newly commissioned HERMES spectrograph on Anglo-Australian Telescope. provides (R ~28,000) spectra in four passbands for 392 stars simultaneously over 2 degree field of view. goal to unravel formation and evolutionary history Milky Way, fossil remnants ancient star events which have been disrupted are now dispersed throughout Galaxy. Chemical tagging seeks identify such solely from their common unique chemical signatures;...
Abstract We describe the first public data release of Dark Energy Survey, DES DR1, consisting reduced single-epoch images, co-added source catalogs, and associated products services assembled over 3 yr science operations. DR1 is based on optical/near-infrared imaging from 345 distinct nights (2013 August to 2016 February) by Camera mounted 4 m Blanco telescope at Cerro Tololo Inter-American Observatory in Chile. wide-area survey covering ∼5000 deg 2 southern Galactic cap five broad...
The ensemble of chemical element abundance measurements for stars, along with precision distances and orbit properties, provides high-dimensional data to study the evolution Milky Way. With this third release Galactic Archaeology HERMES (GALAH) survey, we publish 678 423 spectra 588 571 mostly nearby stars (81.2% are within <2 kpc), observed spectrograph at Anglo-Australian Telescope. This (hereafter GALAH+ DR3) includes all observations from GALAH Phase 1 (bright, main, faint 70%),...
view Abstract Citations (511) References (57) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Standard Globular Cluster Giant Branches in the (M(I), (V - I)o) Plane Da Costa, G. S. ; Armandroff, T. E. CCD photometry V, I (Cousins) bandpasses is presented for a large number of giants eight galactic globular clusters. The (V-I)sub O color giant branch accurately ranks clusters metal abundance, and can accordingly be used to ascertain both abundances abundance...
We present the first data release (DR1) of SkyMapper Southern Survey, a hemispheric survey carried out with Telescope at Siding Spring Observatory in Australia. Here, we strategy, processing, catalogue construction and database schema. The DR1 dataset includes over 66,000 images from Shallow Survey component, covering an area 17,200 deg$^2$ all six passbands $uvgriz$, while full covered by any passband exceeds 20,000 deg$^2$. catalogues contain 285 million unique astrophysical objects,...
The Galactic Archaeology with HERMES (GALAH) survey is a large-scale stellar spectroscopic of the Milky Way and designed to deliver chemical information complementary large number stars covered by $Gaia$ mission. We present GALAH second public data release (GALAH DR2) containing 342,682 stars. For these stars, collaboration provides parameters abundances for up 23 elements community. Here we target selection, observation, reduction detailed explanation how spectra were analysed estimate...
Fast radio bursts (FRBs) are one of the most tantalizing mysteries sky; their progenitors and origins remain unknown until now no rapid multiwavelength follow-up an FRB has been possible. New instrumentation decreased time between observation discovery from years to seconds, enables polarimetry be performed on FRBs for first time. We have discovered (FRB 140514) in real-time 14 May, 2014 at 17:14:11.06 UTC Parkes telescope triggered other wavelengths within hours event. 140514 was found with...
Abstract We present the second data release (DR2) of SkyMapper Southern Survey, a hemispheric survey carried out with Telescope at Siding Spring Observatory in Australia, using six optical filters: u, v, g, r, i, z . DR2 is first to go beyond $\sim\!18$ mag (10 $\sigma$ ) limit Shallow Survey released (DR1), and includes portions sky full depth that reach $>\!21$ g r filters. The photometry has precision as measured by internal reproducibility 1% u v , 0.7% griz More than 21 000 $\deg^2$...
The Galactic Archaeology with HERMES (GALAH) Survey is a massive observational project to trace the Milky Way's history of star formation, chemical enrichment, stellar migration and minor mergers. Using high-resolution (R$\simeq$28,000) spectra taken High Efficiency Resolution Multi-Element Spectrograph (HERMES) instrument at Anglo-Australian Telescope (AAT), GALAH will determine parameters abundances up 29 elements for one million stars. Selecting targets from colour-unbiased catalogue...
ABSTRACT We present a 6D map of the Orphan–Chenab (OC) stream by combining data from Southern Stellar Stream Spectroscopic Survey (S5) and Gaia. reconstruct proper motion, radial velocity, distance, on-sky track, stellar density along with spline models. The has total luminosity MV = −8.2 metallicity [Fe/H] −1.9, similar to classical Milky Way (MW) satellites like Draco. shows drastic changes in its physical width varying 200 pc 1 kpc, but constant line-of-sight velocity dispersion 5...
view Abstract Citations (328) References (104) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Giant Branch of omega Centauri. IV. Abundance Patterns Based on Echelle Spectra 40 Red Giants Norris, John E. ; Da Costa, G. S. Abundances some 20 elements have been determined for a (biased) sample red giants having Mv < -1.5 in the chemically inhomogeneous globular cluster ω results are based high-resolution, high signal-to-noise echelle spectra and permit...
view Abstract Citations (335) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Correlated cyanogen and sodium anomalies in the globular clusters 47 TUC NGC 6752. Cottrell, P. L. ; Da Costa, G. S. Spectroscopic analyses have been made of echelle plates pairs CN-strong CN-weak giants Tuc Differential analysis reveals that 6752 aluminum are enhanced stars by approximately 0.5 dex 0.2 dex, respectively. All other elements studied (Mg, Si, Ca, Fe,...
Spectra have been obtained at the Ca II triplet of a number member giants in seven galactic globular clusters for which current metallicity estimates are either lacking or poorly determined. Similar spectra also eight whose abundances well established. These latter data combined with other existing CaII observations to define (Ca line strength, abundance) relation that encompasses full range metallicities exhibited by Galaxy's cluster system. This calibration is then used determine program...
We present a detailed chemical composition analysis of 35 red giant stars in the globular cluster M22. High resolution spectra for this study were obtained at five observatories, and analyzed uniform manner. have determined abundances representative light proton-capture, alpha, Fe-peak neutron-capture element groups. Our aim is to better understand peculiar enrichment history cluster, which two stellar groups are characterized by different content iron, neutron capture elements Y, Zr Ba,...
view Abstract Citations (274) References (58) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The abundance spread in the giants of NGC 6752. Norris, J. ; Cottrell, P. L. Freeman, K. C. Da Costa, G. S. A spectroscopic survey has been performed 69 stars on or near giant branches metal-poor globular cluster Our basic results are: (i) There is a large range strength violet cyanogen bands red branch, with available evidence strongly suggesting that distribution...
We present a photometric analysis of the star clusters Lindsay 1, Kron 3, NGC 339, 416, 38, and 419 in Small Magellanic Cloud (SMC), observed with Hubble Space Telescope Advanced Camera for Surveys (ACS) F555W F814W filters. Our color-magnitude diagrams (CMDs) extend ∼3.5 mag deeper than main-sequence turnoff points, any previous data. Cluster ages were derived using three different isochrone models: Padova, Teramo, Dartmouth, which are all available ACS system. Fitting ridgelines each...
We present a high resolution spectroscopic analysis of 62 red giants in the Milky Way globular cluster NGC5286. have determined abundances representative light proton-capture, alpha, Fe-peak and neutron-capture element groups, combined them with photometry multiple sequences observed along colour-magnitude diagram. Our principal results are: (i) broad, bimodal distribution s-process abundance ratios, two main s-poor s-rich groups; (ii) substantial star-to-star Fe variations, stars having...
We present CN and CH indices CaII triplet metallicities for 34 giant stars chemical abundances 33 elements in 14 giants the globular cluster M2. Assuming program are members, our analysis reveals (i) an extreme variation line strengths, (ii) a metallicity dispersion with dominant peak at [Fe/H] = -1.7 smaller peaks -1.5 -1.0, (iii) star-to-star abundance variations correlations light O, Na, Al Si (iv) large (and possibly bimodal) distribution of all produced mainly via s-process solar system...
Intermediate resolution spectra at the Ca ii triplet have been obtained for 55 candidate red giants in field of globular cluster M22 with VLT/FORS2 instrument. Spectra were also a number standard clusters to provide calibration observed line strengths overall abundance [Fe/H]. For 41 member stars that lie within V − VHB bounds calibration, we find an distribution is substantially broader than expected from errors alone. We argue this broad cannot be result differential reddening. Instead,...
The SkyMapper Southern Sky Survey is carrying out a search for the most metal-poor stars in Galaxy. It identifies candidates by way of its unique filter set which allows estimation stellar atmospheric parameters. includes narrow centered on Ca ii K 3933 Å line, enabling robust estimate metallicity. Promising are then confirmed with spectroscopy. We present analysis Magellan Inamori Kyocera Echelle high-resolution spectroscopy 122 found first two years commissioning observations. Forty-one...
We report the discovery of an ultra-faint Milky Way satellite galaxy in constellation Pegasus. The concentration stars was detected by applying our overdensity detection algorithm to SDSS-DR 10 and confirmed with deeper photometry from Dark Energy Camera at 4-m Blanco telescope. Fitting model isochrones indicates that this object, Pegasus III, features old metal-poor stellar population ([Fe/H]$\sim-2.1$) a heliocentric distance $205\pm20$ kpc. new system has estimated half-light radius...
ABSTRACT We present the serendipitous discovery of fastest main-sequence hyper-velocity star (HVS) by Southern Stellar Stream Spectroscopic Survey (S5). The S5-HVS1 is a ∼2.35 M⊙ A-type located at distance ∼9 kpc from Sun and has heliocentric radial velocity 1017 ± 2.7 $\mathrm{\, km\, s^{-1}}$ without any signature variability. current 3D in Galactic frame 1755 50 s^{-1}}$. When integrated backwards time, orbit points unambiguously to Centre, implying that was kicked away Sgr A* with ∼1800...
We report the discovery of a nearby dwarf galaxy in constellation Hydrus, between Large and Small Magellanic Clouds. Hydrus 1 is mildy elliptical ultra-faint system with luminosity $M_V\sim$ -4.7 size $\sim$ 50 pc, located 28 kpc from Sun 24 LMC. From spectroscopy 30 member stars, we measure velocity dispersion 2.7 km/s find tentative evidence for radial gradient consistent 3 rotation. 1's indicates that dark matter dominated, but its dynamical mass-to-light ratio M/L 66 significantly...