Now showing items 1-10 of 27
LP 133-373: A new chromospherically active eclipsing dMe binary with a distant, cool white dwarf companion
We report the discovery of the partially eclipsing binary LP 133-373. Nearly identical eclipses along with observed photometric colors and spectroscopy indicate that it is a pair of chromospherically active dM4 stars in a ...
CPD -20 1123 (ALBUS 1) is a bright he-b subdwarf
Based on photometric and astrometric data it has been proposed that Albus 1 (also known as CPD -20 1123) might be a hot white dwarf similar to G191-B2B or, alternatively, a hot subdwarf. We obtained a series of optical ...
The mid-infrared emission of M87
We discuss Subaru and Spitzer Space Telescope imaging and spectroscopy of M87 in the mid-infrared (mid-IR) from 5 to 35 μm. These observations allow us to investigate mid-IR emission mechanisms in the core of M87 and to ...
A new phenomenon in impulsive-flare-associated energetic particles
We present ACE/ULEIS and Wind/STEP observations of a new and unusual feature of energetic ions between 0.02 and 3 MeV nucleon ˉ¹ associated with impulsive solar flares. In addition to the usual velocity dispersion associated ...
The deep x-ray radio blazar survey. III. radio number counts, evolutionary properties, and luminosity function of blazars
Our knowledge of the blazar surface densities and luminosity functions, which are fundamental parameters, relies still on samples at relatively high flux limits. As a result, our understanding of this rare class of active ...
Spectropolarimetric survey of hydrogen-rich white dwarf stars
We have conducted a survey of 61 southern white dwarfs searching for magnetic fields using Zeeman spectropolarimetry. Our objective is to obtain a magnetic field distribution for these objects and, in particular, to find ...
Gemini mid-IR polarimetry of NGC 1068: Polarized structures around the nucleus
We present diffraction-limited, 10 μm imaging polarimetry data for the central regions of the archetypal Seyfert active galactic nucleus NGC 1068. The position angle of polarization is consistent with three dominant ...
The physical origin of negative superhumps in cataclysmic variables
It has been suspected for over 20 years that the observed negative superhumps in cataclysmic variables are due to the retrograde precession of a tilted disk. We present new smooth particle hydrodynamics simulation results ...
Tibet: Holy place, not "Western Storehouse"!
[No abstract available]
Existence and Nonexistence Results for a Class of Quasilinear Elliptic Systems
Using variational methods, we prove the existence and nonexistence of positive solutions for a class of -Laplacian systems with a parameter.