4.3k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR463 papers
- European Southern ObservatoryCL443 papers
- Pontificia Universidad Católica de ChileCL281 papers
- University of WarsawPL244 papers
- California Institute of TechnologyUS242 papers
- University of ChileCL232 papers
- Space Telescope Science InstituteUS212 papers
- Center for Astrophysics Harvard & SmithsonianUS197 papers
- University of CambridgeGB192 papers
- Millennium Institute of AstrophysicsCL186 papers
- Universidad Andrés BelloCL177 papers
- Observatoire de ParisFR169 papers
267 papers · 1 filter
The Frequency of Warm Debris Disks and Transition Disks in a Complete Sample of Intermediate-Mass GLIMPSE Stars: Placing Constraints on Disk Lifetimes
B. Uzpen, H. A. Kobulnicky, K. Kinemuchi
The incidence of dusty debris disks around low- and intermediate-mass stars has been investigated numerous times in order to understand the early stages of planet formation. Most n…
A likely optical counterpart of the G292.0+1.8 pulsar wind nebula
S. V. Zharikov, Yu. A. Shibanov, D. A. Zyuzin +2
G292.0+1.8 is the Cas A-like supernova remnant containing the young pulsar PSR J1124-5916, which powers a compact torus-like pulsar wind nebula with a jet visible in X-rays. We hav…
A search for spectroscopic binaries in the galactic globular cluster M4. Based on 5973 individual spectra collected at VLT
V. Sommariva, G. Piotto, M. Rejkuba +4
We present a large multi-epoch high resolution spectroscopic investigation for the search of binary candidates in the Galactic Globular Cluster (GGC) M4. The aim of our work is the…
Optical and near-IR photometric study of the open cluster NGC 637 and NGC 957
R. K. S. Yadav, Brijesh Kumar, A. Subramaniam +2
We present UBVRI CCD photometry in the region of the open clusters NGC 637 and NGC 957. The radii are found to be 4.2 arcmin and 4.3 arcmin. Their reddenings E(B-V) are 0.64+/-0.05…
The PN.S Elliptical Galaxy Survey: the dark matter in NGC 4494
N. R. Napolitano, A. J. Romanowsky, L. Coccato +12
We present new Planetary Nebula Spectrograph observations of the ordinary elliptical galaxy NGC 4494, resulting in positions and velocities of 255 PNe out to 7 effective radii (25…
Microlensing Event MOA-2007-BLG-400: Exhuming the Buried Signature of a Cool, Jovian-Mass Planet
Subo Dong, I. A. Bond, A. Gould +55
We report the detection of the cool, Jovian-mass planet MOA-2007-BLG-400Lb. The planet was detected in a high-magnification microlensing event (with peak magnification A_max = 628)…
Tombaugh 2: The First Open Cluster with a Significant Abundance Spread or Embedded in a Cold Stellar Stream?
P. M. Frinchaboy, A. F. Marino, S. Villanova +3
We present new abundances and radial velocities for stars in the field of the open cluster Tombaugh 2, which has been suggested to be associated with the Galactic Anticenter Stella…
Multi-wavelength study of a young open cluster NGC 7419
Himali Joshi, Brijesh Kumar, K. P. Singh +3
Using UBVRI Halpha CCD photometric observations and the archival NIR and X-ray data, we have carried out a multi-wavelength study of a young star cluster NGC 7419. An age of 22.5+/…
Frequency analysis of Cepheids in the Large Magellanic Cloud. New types of classical Cepheid pulsators
P. Moskalik, Z. Kolaczkowski
We have performed a detailed systematic search for multiperiodicity in the Population I Cepheids of the Large Magellanic Cloud. In this process we have identified for the first tim…
A spectroscopic confirmation of the Bootes II dwarf spheroidal
A. Koch, M. I. Wilkinson, J. T. Kleyna +6
We present a new suite of photometric and spectroscopic data for the faint Bootes II dwarf spheroidal galaxy candidate. Our deep photometry, obtained with the INT/WFC, suggests a d…
Mapping the Dark Side with DEIMOS: Globular Clusters, X-ray Gas, and Dark Matter in the NGC 1407 Group
Aaron J. Romanowsky, Jay Strader, Lee R. Spitler +4
NGC 1407 is the central elliptical in a nearby evolved galaxy group apparently destined to become a cluster core. We use the kinematics of globular clusters to probe the dynamics a…
The Araucaria Project: The Distance to the Sculptor Group Galaxy NGC 247 from Cepheid Variables Discovered in a Wide-Field
A. Garcia-Varela, G. Pietrzynski, W. Gieren +9
We report on the discovery of a Cepheid population in the Sculptor Group spiral galaxy NGC 247 for the first time. On the basis of wide-field images collected in photometric survey…
Galaxy populations in the Antlia cluster. II. Compact elliptical galaxy candidates
Analia V. Smith Castelli, Favio R. Faifer, Tom Richtler +1
We present a photometric analysis of four galaxies classified as compact elliptical (cE) galaxies in the FS90 Antlia Group catalogue. Only 6 members of this rare type of galaxies a…
The Variable Stars of the Draco Dwarf Spheroidal Galaxy - Revisited
K. Kinemuchi, H. C. Harris, Horace A. Smith +4
We present a CCD survey of variable stars in the Draco dwarf spheroidal galaxy. This survey, which has the largest areal coverage since the original variable star survey by Baade &…
The Stellar Populations of M33's Outer Regions IV: Inflow History and Chemical Evolution
Michael K. Barker, Ata Sarajedini
We have modelled the observed color-magnitude diagram (CMD) at one location in M33's outskirts under the framework of a simple chemical evolution scenario which adopts instantaneou…
Spectroscopic and Photometric evidence of two stellar populations in the Galactic Globular Cluster NGC6121 (M4)
A. F. Marino, S. Villanova, G. Piotto +4
AIMS. We present abundance analysis based on high resolution spectra of 105 isolated red giant branch (RGB) stars in the Galactic Globular Cluster NGC 6121 (M4). Our aim is to stud…
Ca II Triplet Spectroscopy of Small Magellanic Cloud Red Giants. I. Abundances and Velocities for a Sample of Clusters
M. C. Parisi, A. J. Grocholski, D. Geisler +2
We have obtained near-infrared spectra covering the Ca II triplet lines for a number of stars associated with 16 SMC clusters using the VLT + FORS2. These data compose the largest…
The Nature of UCDs: Internal Dynamics from an Expanded Sample and Homogeneous Database
Steffen Mieske, Michael Hilker, Andres Jordan +9
We have obtained high-resolution spectra of 23 ultra-compact dwarf galaxies (UCDs) in the Fornax cluster with -10.4>M_V>-13.5 mag (10^6<M/M_*<10^8), using FLAMES/Giraffe at the VLT…
Blazhko Effect in Double Mode Cepheids
P. Moskalik, Z. Kolaczkowski
Systematic survey for multiperiodicity in the LMC Cepheids (Moskalik, Kolaczkowski & Mizerski 2004, 2006) has led to discovery of several new forms of pulsational behaviour. One of…
The young Galactic star cluster [DBS2003]179
J. Borissova, V. D. Ivanov, M. M. Hanson +4
Recent near- and mid-infrared surveys have brought evidence that the Milky Way continues to form massive clusters. We carry out a program to determine the basic physical properties…
Ultra-High Energy Cosmic Rays Detected by the Pierre Auger Observatory: First Direct Evidence, and its Implications, that a Subset Originate in Nearby Radiogalaxies
Neil M. Nagar, Javier Matulich
(abridged) The Pierre Auger Collaboration has reported 27 Ultra-High Energy Cosmic Ray Events (UHECRs) with energies above 56 EeV and well determined arrival directions as of 2007…
Unveiling the nature of six HMXBs through IR spectroscopy
E. Nespoli, J. Fabregat, R. E. Mennickent
The International Gamma-Ray Astrophyiscs Laboratory (INTEGRAL) is discovering a large number of new hard X-ray sources, many of them being HMXBs. The identification and spectral ch…
A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192
D. P. Bennett, I. A. Bond, A. Udalski +44
We report the detection of an extrasolar planet of mass ratio q ~ 2 x 10^(-4) in microlensing event MOA-2007-BLG-192. The best fit microlensing model shows both the microlensing pa…
The Araucaria Project: the Local Group Galaxy WLM--Distance and metallicity from quantitative spectroscopy of blue Supergiants
M. A. Urbaneja, R. -P. Kudritzki, F. Bresolin +3
The quantitative analysis of low resolution spectra of A and B supergiants is used to determine a distance modulus of 24.99 +/- 0.10 mag (995 +/- 46 Kpc) to the Local Group galaxy…