Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2.6k papers
- University of California, BerkeleyUS2.5k papers
- The Ohio State UniversityUS2.3k papers
- University of ArizonaUS2.1k papers
- Lawrence Berkeley National LaboratoryUS2.1k papers
- SLAC National Accelerator LaboratoryUS2k papers
- University of California, IrvineUS2k papers
- Yale UniversityUS1.9k papers
- University of Wisconsin–MadisonUS1.9k papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR1.9k papers
- McGill UniversityCA1.9k papers
- University of ChicagoUS1.9k papers
26 papers · 2 filters
Direct Evidence for an Enhancement of Helium in Giant Stars in Omega Centauri
A. K. Dupree, Jay Strader, Graeme H. Smith
The double main sequence identified in the globular cluster Omega Centauri has been interpreted using isochrones to indicate a large variation in the abundance of helium. If true,…
Thermohaline Mixing and its Role in the Evolution of Carbon and Nitrogen Abundances in Globular Cluster Red Giants: The Test Case of Messier 3
George C. Angelou, Ross P. Church, Richard J. Stancliffe +2
We review the observational evidence for extra mixing in stars on the red giant branch (RGB) and discuss why thermohaline mixing is a strong candidate mechanism. We recall the simp…
Turbulent mixing and layer formation in double-diffusive convection: 3D numerical simulations and theory
Erica Rosenblum, Pascale Garaud, Adrienne Traxler +1
Double-diffusive convection, often referred to as semi-convection in astrophysics, occurs in thermally and compositionally stratified systems which are stable according to the Ledo…
Numerically determined transport laws for fingering ("thermohaline") convection in astrophysics
Adrienne Traxler, Pascale Garaud, Stephan Stellmach
We present the first three-dimensional simulations of fingering convection performed in a parameter regime close to the one relevant for astrophysics, and reveal the existence of s…
Cataclysmic Variables and Other Compact Binaries in the Globular Cluster NGC 362: Candidates from Chandra and HST
Bruce Margon, B. Beck-Winchatz, L. Homer +7
Highly sensitive and precise X-ray imaging from Chandra, combined with the superb spatial resolution of HST optical images, dramatically enhances our empirical understanding of com…
Establishing Alpha Oph as a Prototype Rotator: Improved Astrometric Orbit
Sasha Hinkley, John D. Monnier, Ben R. Oppenheimer +24
The nearby star Alpha Oph (Ras Alhague) is a rapidly rotating A5IV star spinning at ~89% of its breakup velocity. This system has been imaged extensively by interferometric techniq…
The Formation of Low-Mass Binary Star Systems Via Turbulent Fragmentation
S. S. R. Offner, K. M. Kratter, C. D. Matzner +2
We characterize the infall rate onto protostellar systems forming in self-gravitating radiation-hydrodynamic simulations. Using two dimensionless parameters to determine disks' sus…
GEANT4 Simulations of Gamma-Ray Emission from Accelerated Particles in Solar Flares
Shichao Tang, David M. Smith
Gamma-ray spectroscopy provides diagnostics of particle acceleration in solar flares, but care must be taken when interpreting the spectra due to effects of the angular distributio…
A Third Hot White Dwarf Companion Detected by Kepler
Joshua A. Carter, Saul Rappaport, Daniel Fabrycky
We have found a system listed in the Kepler Binary Catalog (3.273 day period; Prsa et al. 2010) that we have determined is comprised of a low-mass, thermally-bloated, hot white dwa…
A spectropolarimetric view on the nature of the peculiar Type I SN 2005hk
J. R. Maund, J. C. Wheeler, L. Wang +6
We report two spectropolarimetric observations of SN 2005hk, which is a close copy of the "very peculiar" SN 2002cx, showing low peak luminosity, slow decline, high ionization near…
The Unification of Asymmetry Signatures of Type Ia Supernovae
J. R. Maund, P. A. Hoeflich, F. Patat +6
We present a compilation of the geometry measures acquired using optical and IR spectroscopy and optical spectropolarimetry to probe the explosion geometry of Type Ia SNe. Polariza…
What Drives the Expansion of Giant HII Regions?: A Study of Stellar Feedback in 30 Doradus
Laura A. Lopez, Mark R. Krumholz, Alberto D. Bolatto +2
Observations show that star formation is an inefficient and slow process. This result can be attributed to the injection of energy and momentum by stars that prevents free-fall col…
Tomographic reconstruction of the three-dimensional structure of the HH30 jet
Fabio De Colle, Carlos del Burgo, Alejandro Raga
The physical parameters of Herbig-Haro jets are usually determined from emission line ratios, obtained from spectroscopy or narrow band imaging, assuming that the emitting region i…
The Gemini NICI Planet-Finding Campaign: Discovery of a Close Substellar Companion to the Young Debris Disk Star PZ Tel
Beth A. Biller, Michael C. Liu, Zahed Wahhaj +24
We report the discovery of a tight substellar companion to the young solar analog PZ Tel, a member of the Beta Pictoris moving group observed with high contrast adaptive optics ima…
An MHD study of SN 1006 and determination of the ambient magnetic field direction
E. M. Schneiter, P. F. Velázquez, E. M. Reynoso +1
In this work we employ an MHD numerical code to reproduce the morphology observed for SN 1006 in radio synchrotron and thermal X-ray emission. We introduce a density discontinuity,…
Evolution of massive stars with pulsation-driven superwinds during the RSG phase
Sung-Chul Yoon, Matteo Cantiello
Pulsations driven by partial ionization of hydrogen in the envelope are often considered important for driving winds from red supergiants (RSGs). In particular, it has been suggest…
Gyroscopic pumping of large-scale flows in stellar interiors, and application to Lithium Dip stars
Pascale Garaud, Peter Bodenheimer
The maintenance of large-scale differential rotation in stellar convective regions by rotationally influenced convective stresses also drives large-scale meridional flows by angula…
A model of the entropy flux and Reynolds stress in turbulent convection
Pascale Garaud, Gordon I. Ogilvie, Neil Miller +1
We propose a closure model for the transport of entropy and momentum in astrophysical turbulence, intended for application to rotating stellar convective regions. Our closure model…
Type Ib/c supernovae in binary systems I. Evolution and properties of the progenitor stars
Sung-Chul Yoon, Stan E. Woosley, Norbert Langer
We investigate the evolution of Type Ib/c supernova (SN Ib/c) progenitors in close binary systems, using new evolutionary models that include the effects of rotation, with initial…
A Re-Evaluation of the Evolved Stars in the Globular Cluster M13
Eric L. Sandquist, Mark Gordon, Daniel Levine +1
We present photometry for all bright red giant branch (RGB), horizontal branch (HB), and asymptotic giant branch (AGB) stars within 10' of the center of M13. We find support for th…
Direct Confirmation of the Asymmetry of the Cas A Supernova with Light Echoes
A. Rest, R. J. Foley, B. Sinnott +21
We report the first detection of asymmetry in a supernova (SN) photosphere based on SN light echo (LE) spectra of Cas A from the different perspectives of dust concentrations on it…
The Discovery of Ellipsoidal Variations in the Kepler Light Curve of HAT-P-7
William F. Welsh, Jerome A. Orosz, Sara Seager +5
We present an analysis of the early Kepler observations of the previously discovered transiting planet HAT-P-7b. The light curve shows the transit of the star, the occultation of t…
Electron fraction constraints based on Nuclear Statistical Equilibrium with beta equilibrium
A. Arcones, G. Martinez-Pinedo, L. F. Roberts +1
The electron-to-nucleon ratio or electron fraction is a key parameter in many astrophysical studies. Its value is determined by weak-interaction rates that are based on theoretical…
Do Wolf-Rayet stars have similar locations in hosts as type Ib/c supernovae and long gamma-ray bursts?
G. Leloudas, J. Sollerman, A. J. Levan +3
Aims: We study the distribution of Wolf-Rayet (WR) stars and their subtypes with respect to their host galaxy light distribution. We thus want to investigate whether WR stars are p…