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282 papers · 1 filter
The MiMeS Project: Magnetism in Massive Stars
G. A. Wade, E. Alecian, D. A. Bohlender +11
The Magnetism in Massive Stars (MiMeS) Project is a consensus collaboration among the foremost international researchers of the physics of hot, massive stars, with the basic aim of…
The MiMeS Project: First Results
J. H. Grunhut, E. Alecian, D. A. Bohlender +11
Massive stars are those stars with initial masses above about 8 times that of the sun, eventually leading to catastrophic explosions in the form of supernovae. These represent the…
MOST photometry of the enigmatic PMS pulsator HD 142666
K. Zwintz, T. Kallinger, D. B. Guenther +11
We present precise photometry of the pulsating Herbig Ae star HD 142666 obtained in two consecutive years with the MOST (Microvariability & Oscilations of STars) satellite. Previou…
Diagnoses to unravel secular hydrodynamical processes in rotating main sequence stars
T. Decressin, S. Mathis, A. Palacios +4
(Abridged) We present a detailed analysis of the main physical processes responsible for the transport of angular momentum and chemical species in the radiative regions of rotating…
Super Earth Explorer: A Coronagraphic Off-Axis Space Telescope
J. Schneider, A. Boccaletti, D. Mawet +12
The Super-Earth Explorer is an Off-Axis Space Telescope (SEE-COAST) designed for high contrast imaging. Its scientific objective is to make the physico-chemical characterization of…
Properties of WNh stars in the Small Magellanic Cloud: evidence for homogeneous evolution
F. Martins, D. J. Hillier, J. C. Bouret +4
We derive the physical properties of three WNh stars in the SMC to constrain stellar evolution beyond the main sequence at low metallicity and to investigate the metallicity depend…
Direct Imaging of Multiple Planets Orbiting the Star HR 8799
C. Marois, B. Macintosh, T. Barman +5
Direct imaging of exoplanetary systems is a powerful technique that can reveal Jupiter-like planets in wide orbits, can enable detailed characterization of planetary atmospheres, a…
Spectroscopic analysis of DA white dwarfs from the McCook & Sion catalog
A. Gianninas, P. Bergeron, M. T. Ruiz
For some years now, we have been gathering optical spectra of DA white dwarfs in an effort to study and define the empirical ZZ Ceti instability strip. However, we have recently ex…
On the Age of the Widest Very Low Mass Binary
Etienne Artigau, David Lafreniere, Loic Albert +1
We have recently identified the widest very low-mass binary (2M0126AB), consisting of an M6.5V and an M8V dwarf with a separation of ~5100 AU, which is twice as large as that of th…
Cool White Dwarfs Identified in the Second Data Release of the UKIRT Infrared Deep Sky Survey
N. Lodieu, S. K. Leggett, P. Bergeron +1
We have paired the Second Data Release of the Large Area Survey of the UKIRT Infrared Deep Sky Survey with the Fifth Data Release of the Sloan Digital Sky Survey to identify ten co…
MOST discovers a multimode delta Scuti star in a triple system: HD 61199
M. Hareter, O. Kochukhov, H. Lehmann +13
A field star, HD 61199 (V ~ 8), simultaneously observed with Procyon by the MOST (Microvariability & Oscillations of STars) satellite in continuous runs of 34, 17, and 34 days in 2…
Photometric variability of WC9 stars
R. Fahed, A. F. J. Moffat, A. Z. Bonanos
Do some Wolf-Rayet stars owe their strong winds to something else besides radiation pressure? The answer to this question is still not entirely obvious, especially in certain Wolf-…
Photometric variability of the T Tauri star TW Hya on time scales of hours to years
Slavek M. Rucinski, Jaymie M. Matthews, Rainer Kuschnig +7
MOST (Microvariability & Oscillations of STars) and ASAS (All Sky Automated Survey) observations have been used to characterize photometric variability of TW Hya on time scales fro…
Optical-mechanical operation of the F2T2 Filter: a tunable filter designed to search for First Light
Erin Mentuch, Alan Scott, Roberto Abraham +16
The Flamingos-2 Tandem Tunable filter is a tunable, narrow-band filter, consisting of two Fabry-Perot etalons in series, capable of scanning to any wavelength from 0.95 to 1.35 mic…
MOST satellite photometry of stars in the M67 field: Eclipsing binaries, blue stragglers and delta-Scuti variables
Theodor Pribulla, Slavek Rucinski, Jaymie M. Matthews +7
We present two series of MOST (Microvariability & Oscillations of STars) space-based photometry, covering nearly continuously 10 days in 2004 and 30 days in 2007, of selected varia…
Discovery of a Wide Substellar Companion to a Nearby Low-Mass Star
Jacqueline Radigan, David Lafrenière, Ray Jayawardhana +1
We report the discovery of a wide (135+/-25 AU), unusually blue L5 companion 2MASS J17114559+4028578 to the nearby M4.5 dwarf G 203-50 as a result of a targeted search for common p…
Discovery of Eclipsing Binary Central Stars in the Planetary Nebulae M 3-16, H 2-29 and M 2-19
B. Miszalski, A. Acker, A. F. J. Moffat +2
Progress in understanding the formation and evolution of planetary nebulae (PN) has been restricted by a paucity of well-determined central star masses. To address this deficiency…
SDSS J142625.71+575218.3: The First Pulsating White Dwarf with a Large Detectable Magnetic Field
P. Dufour, G. Fontaine, J. Liebert +2
We report the discovery of a strong magnetic field in the unique pulsating carbon-atmosphere white dwarf SDSS J142625.71+575218.3. From spectra gathered at the MMT and Keck telesco…
The very massive binary NGC3603-A1
O. Schnurr, A. F. J. Moffat, N. St-Louis +2
Using VLT/SINFONI, we have obtained repeated AO-assisted, NIR spectroscopy of the three central WN6ha stars in the core of the very young (~1 Myr), massive and dense Galactic clust…
A Spectroscopic Survey of WNL Stars in the LMC: General Properties and Binary Status
O. Schnurr, A. F. J. Moffat, N. St-Louis +2
We report the results of an intense, spectroscopic survey of all 41 late-type, nitrogen-rich Wolf-Rayet (WR) stars in the Large Magellanic Cloud (LMC) observable with ground-based…
IRAS04325+2402C: A very low mass object with an edge-on disk
Alexander Scholz, Ray Jayawardhana, Kenneth Wood +3
IRAS04325+2402C is a low luminosity object located near a protostar in Taurus. We present new spatially-resolved mm observations, near-infrared spectroscopy, and Spitzer photometry…
Deep inside low-mass stars
Corinne Charbonnel, Suzanne Talon
Low-mass stars exhibit, at all stages of their evolution, the signatures of complex physical processes that require challenging modeling beyond standard stellar theory. In this rev…
The Solar Neighborhood. XX. Discovery and Characterization of 21 New Nearby White Dwarf Systems
John P. Subasavage, Todd J. Henry, P. Bergeron +2
We present medium resolution spectroscopy and multi-epoch VRI photometry for 21 new nearby (< 50 pc) white dwarf systems brighter than V ~ 17. Of the new systems, ten are DA (inclu…
Direct spectroscopic observations of clumping in O-star winds
Sebastien Lepine, Anthony F. J. Moffat
We report the detection and monitoring of transient substructures in the radiation-driven winds of five massive, hot stars in different evolutionary stages. Clumping in the winds o…