Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2k papers
- University of British ColumbiaCA1.9k papers
- McGill UniversityCA1.9k papers
- University of VictoriaCA1.8k papers
- University of California, Santa CruzUS1.7k papers
- Rutherford Appleton LaboratoryGB1.7k papers
- University of ManchesterGB1.7k papers
- Queen Mary University of LondonGB1.7k papers
- University of PisaIT1.6k papers
- University of EdinburghGB1.6k papers
- University of BirminghamGB1.6k papers
- Heidelberg UniversityDE1.6k papers
31 papers · 2 filters
Harmonic analysis of the Ha velocity field of NGC 4254
Laurent Chemin, Olivier Hernandez, Chantal Balkowski +2
The ionized gas kinematics of the Virgo Cluster galaxy NGC 4254 (Messier 99) is analyzed by an harmonic decomposition of the velocity field into Fourier coefficients. The aims of t…
Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
C. Marois, D. Lafreniere, R. Doyon +2
Angular differential imaging is a high-contrast imaging technique that reduces quasi-static speckle noise and facilitates the detection of nearby companions. A sequence of images i…
Wind ionization structure of the short-period eclipsing LMC Wolf-Rayet binary BAT99-129: preliminary results
C. Foellmi, A. F. J. Moffat, S. V. Marchenko
BAT99-129 is a rare, short-period eclipsing Wolf-Rayet binary in the Large Magellanic Cloud. We present here medium-resolution NTT/EMMI spectra that allow us to disentangle the spe…
A Virgo high-resolution Halpha kinematical survey : II. The Atlas
L. Chemin, C. Balkowski, V. Cayatte +8
A catalog of ionized gas velocity fields for a sample of 30 spiral and irregular galaxies of the Virgo cluster has been obtained by using three-dimensional optical data. The aim of…
Influence of gravity waves on the internal rotation and Li abundance of solar-type stars
Corinne Charbonnel, Suzanne Talon
The Sun's rotation profile and lithium content have been difficult to understand in the context of conventional models of stellar evolution. Classical hydrodynamical models predict…
The magnetism of the solar interior for a complete MHD solar vision
S. Turck-Chieze, T. Appourchaux, J. Ballot +37
The solar magnetism is no more considered as a purely superficial phenomenon. The SoHO community has shown that the length of the solar cycle depends on the transition region betwe…
Exciting new features in the frequency spectrum of the EC14026 star HS0702+6043 - Simultaneous g-modes and p-modes in a sdB pulsator
S. Schuh, J. Huber, S. Dreizler +7
The discovery of a long-period g-mode oscillation in the previously known short-period p-mode sdB pulsator HS0702+6043 makes this star an extraordinary object, unique as a member o…
HS0702+6043: A star showing both short-period p-mode and long-period g-mode oscillations
S. Schuh, J. Huber, S. Dreizler +4
[Context.] The hot subdwarf B star HS0702+6043 is known as a large-amplitude, short-period p-mode pulsator of the EC14026 type. Its atmospheric parameters place it at the common bo…
The Wolf-Rayet hydrogen puzzle -- an observational point of view
C. Foellmi, S. V. Marchenko, A. F. J. Moffat
Significant amounts of hydrogen were found in very hot early-type single WN stars in the SMC and the LMC. Recently, we found similar evidence in the Wolf-Rayet star of a short-peri…
The massive eclipsing LMC Wolf-Rayet binary BAT99-129. 1 Orbital parameters, hydrogen content and spectroscopic characteristics
C. Foellmi, A. F. J. Moffat, S. V. Marchenko
BAT99-129 in the LMC is one among a handful of extra-galactic eclipsing Wolf-Rayet binaries known. We present blue, medium-resolution, phase-dependent NTT-EMMI spectra of this syst…
A Local Group Polar Ring Galaxy: NGC 6822
Serge Demers, Paolo Battinelli, William E. Kunkel
Star counts, obtained from a 2 x 2 degree area centered on NGC 6822 have revealed an optical image of this galaxy composed of two components: in addition to the well-known HI disk…
HI Detection in two Dwarf S0 Galaxies in Nearby Groups: ESO384-016 and NGC 59
Sylvie F. Beaulieu, Kenneth C. Freeman, Claude Carignan +2
An \hi survey of 10 dE/dS0 galaxies in the nearby Sculptor and Centaurus A groups was made using the Australia Telescope Compact Array (ATCA). The observed galaxies have accurate d…
A gamma-ray burst remnant in our Galaxy: HESS J1303-631
A. Atoyan, J. Buckley, H. Krawczynski
We present the results of our investigation of the multiwavelength data on HESS J1303-631, an unidentified TeV source serendipitously discovered in the Galactic plane by the HESS c…
High Energy Cosmic Rays from Local GRBs
A. Atoyan, C. D. Dermer
We have developed a model that explains cosmic rays with energies E between \~0.3 PeV and the energy of the second knee at E_2 ~ 3*10^{17} eV as originating from a recent Galactic…
Stellar Model Analysis of the Oscillation Spectrum of eta Bootis Obtained from MOST
D. B. Guenther, T. Kallinger, P. Reegen +8
Eight consecutive low-frequency radial p-modes are identified in the G0 IV star eta Bootis based on 27 days of ultraprecise rapid photometry obtained by the MOST (Microvariability…
The Gemini Deep Deep Survey. VII. The Redshift Evolution of the Mass-Metallicity Relation
S. Savaglio, K. Glazebrook, D. Le Borgne +10
We have investigated the mass-metallicity (M-Z) relation using galaxies at 0.4<z<1.0 from the Gemini Deep Deep Survey and Canada-France Redshift Survey. Deep K and z' band photomet…
An Extreme Case of a Misaligned Highly Flattened Wind in the Wolf-Rayet Binary CX Cephei
A. Villar-Sbaffi, N. St-Louis, Anthony F. J. Moffat +3
CX Cep (WR 151) is the WR+O binary (WN5+O5V) with the second shortest period known in our Galaxy. To examine the circumstellar matter distribution and to better constraint the orbi…
The Potential of Multi-Colour Photometry for Pulsating Subdwarf B Stars
S. K. Randall, G. Fontaine, P. Brassard +1
We investigate the potential of multi-colour photometry for partial mode identification in both long- and short-period variable subdwarf B stars. The technique presented is based o…
Towards an Empirical Determination of the ZZ Ceti Instability Strip
A. Gianninas, P. Bergeron, G. Fontaine
We present atmospheric parameters for a large sample of DA white dwarfs that are known to be photometrically constant. For each star, we determine the effective temperature and sur…
The Nature of the Driving Mechanism in the Pulsating Hybrid PG 1159 Star Abell 43
P. -O. Quirion, G. Fontaine, P. Brassard
We extend our previous pulsational stability analyses of PG 1159 stars by modeling the hybrid PG 1159 type star Abell 43. We show that the standard kappa-mechanism due to the ioniz…
On the relevance of the Tremaine-Weinberg method applied to H-alpha velocity field.Pattern speeds determination in M100 (NGC 4321)
O. Hernandez, H. Wozniak, C. Carignan +3
The relevance of the Tremaine-Weinberg (TW) method is tested to measure the bar, spiral and inner structure pattern speeds using a gaseous velocity field. The TW method is applied…
Hydrodynamical stellar models including rotation, internal gravity waves and atomic diffusion. I. Formalism and tests on Pop I dwarfs
S. Talon, C. Charbonnel
In this paper, we develop a formalism in order to incorporate the contribution of internal gravity waves to the transport of angular momentum and chemicals over long time-scales in…
TRIDENT: an Infrared Differential Imaging Camera Optimized for the Detection of Methanated Substellar Companions
C. Marois, R. Doyon, D. Nadeau +5
A near-infrared camera in use at the Canada-France-Hawaii Telescope (CFHT) and at the 1.6-m telescope of the Observatoire du Mont-Megantic is described. The camera is based on a Ha…
Spectroscopic study of the long-period dust-producing WC7pd+O9 binary HD192641
L. Lefevre, S. V. Marchenko, S. Lepine +12
We present the results of an optical spectroscopic study of the massive Wolf-Rayet binary WR137. These data cover the dust-formation maximum in 1997. Combining all available measur…