scholarly journals High-Resolution Optical Observations of Extreme-Ultraviolet–selected Active Late-Type Stars

2002 ◽  
Vol 123 (5) ◽  
pp. 2796-2805 ◽  
Author(s):  
Damian J. Christian ◽  
Mihalis Mathioudakis
Keyword(s):  
High Resolution ◽  
Extreme Ultraviolet ◽  
Optical Observations ◽  
Late Type

scholarly journals Simulating the X-ray evolution of late-type galaxies with population synthesis

2012 ◽  
Vol 8 (S290) ◽  
pp. 375-376
Author(s):  
Zhao-yu Zuo ◽  
Xiang-dong Li
Keyword(s):  
High Resolution ◽  
Physical Properties ◽  
Stellar Mass ◽  
Optical Observations ◽  
Population Synthesis ◽  
Late Type ◽  
X Ray ◽  
Global Emission ◽  
X Ray Binaries ◽  
Cosmic History

AbstractUsing an evolutionary population synthesis code, we modeled the global emission of X-ray binaries in late-type galaxies, its relations with other physical properties (i.e., optical luminosity, stellar mass, etc.) of the galaxies, and their evolution with redshift over the cosmic history, which may be investigated further by future high-resolution X-ray and optical observations.

High resolution tunnel junction extreme ultraviolet detectors limited by quasiparticle counting statistics

1999 ◽  
Vol 9 (2) ◽  
pp. 3330-3333 ◽  
Author(s):  
S. Friedrich ◽  
J.B. Le Grand ◽  
L.J. Hiller ◽  
J. Kipp ◽  
M. Frank ◽  
...  
Keyword(s):  
High Resolution ◽  
Tunnel Junction ◽  
Extreme Ultraviolet ◽  
Ultraviolet Detectors ◽  
Counting Statistics

scholarly journals Energetics of Hi-C EUV brightenings

2018 ◽  
Vol 615 ◽  
pp. A47 ◽  
Author(s):  
Srividya Subramanian ◽  
Vinay L. Kashyap ◽  
Durgesh Tripathi ◽  
Maria S. Madjarska ◽  
John G. Doyle
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Extreme Ultraviolet ◽  
Thermal Structure ◽  
Emission Measure ◽  
Light Curves ◽  
Solar Dynamics Observatory ◽  
Differential Emission Measure ◽  
Dominant Mechanism ◽  
Solar Dynamics

We study the thermal structure and energetics of the point-like extreme ultraviolet (EUV) brightenings within a system of fan loops observed in the active region AR 11520. These brightenings were simultaneously observed on 2012 July 11 by the High-resolution Coronal (Hi-C) imager and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO). We identified 27 brightenings by automatically determining intensity enhancements in both Hi-C and AIA 193 Å light curves. The energetics of these brightenings were studied using the Differential Emission Measure (DEM) diagnostics. The DEM weighted temperatures of these transients are in the range log T(K) = 6.2−6.6 with radiative energies ≈1024−25 ergs and densities approximately equal to a few times 109 cm−3. To the best of our knowledge, these are the smallest brightenings in EUV ever detected. We used these results to determine the mechanism of energy loss in these brightenings. Our analysis reveals that the dominant mechanism of energy loss for all the identified brightenings is conduction rather than radiation.

scholarly journals Generation of high-resolution kagome lattice structures using extreme ultraviolet interference lithography

2012 ◽  
Vol 101 (9) ◽  
pp. 093104 ◽  
Author(s):  
Li Wang ◽  
Bernd Terhalle ◽  
Vitaliy A. Guzenko ◽  
Alan Farhan ◽  
Mohamad Hojeij ◽  
...  
Keyword(s):  
High Resolution ◽  
Extreme Ultraviolet ◽  
Interference Lithography ◽  
Lattice Structures ◽  
Kagome Lattice ◽  
Kagomé Lattice

High-Resolution Observations of the Extreme Ultraviolet Sun

1997 ◽  
pp. 123-141
Author(s):  
R. A. Harrison ◽  
A. Fludra ◽  
C. D. Pike ◽  
J. Payne ◽  
W. T. Thompson ◽  
...  
Keyword(s):  
High Resolution ◽  
Extreme Ultraviolet

scholarly journals Extreme Ultraviolet Spectroscopy of Magnetic Cataclysmic Variables

1996 ◽  
Vol 152 ◽  
pp. 309-316
Author(s):  
Frits Paerels ◽  
Min Young Hur ◽  
Christopher W. Mauche
Keyword(s):  
High Resolution ◽  
White Dwarf ◽  
Extreme Ultraviolet ◽  
Cataclysmic Variables ◽  
Ultraviolet Spectroscopy ◽  
Temperature Structure ◽  
Polar Cap ◽  
Ultraviolet Emission ◽  
X Ray ◽  
Magnetic Cataclysmic Variables

A longstanding problem in the interpretation of the X-ray and extreme ultraviolet emission from strongly magnetic cataclysmic variables can be addressed definitively with high resolution EUV spectroscopy. A detailed photospheric spectrum of the accretion-heated polar cap of the white dwarf is sensitive in principle to the temperature structure of the atmosphere. This may allow us to determine where and how the bulk of the accretion energy is thermalized. The EUVE data on AM Herculis and EF Eridani are presented and discussed in this context.

scholarly journals The Solar Orbiter SPICE instrument

2020 ◽  
Vol 642 ◽  
pp. A14 ◽  
Author(s):  
◽  
M. Anderson ◽  
T. Appourchaux ◽  
F. Auchère ◽  
R. Aznar Cuadrado ◽  
...  
Keyword(s):  
High Resolution ◽  
Data Processing ◽  
Extreme Ultraviolet ◽  
High Resolution Imaging ◽  
Concept Design ◽  
Performance Measurements ◽  
Imaging Spectrometer ◽  
Scientific Success ◽  
Resolution Imaging ◽  
Orbiter Mission

Aims. The Spectral Imaging of the Coronal Environment (SPICE) instrument is a high-resolution imaging spectrometer operating at extreme ultraviolet wavelengths. In this paper, we present the concept, design, and pre-launch performance of this facility instrument on the ESA/NASA Solar Orbiter mission. Methods. The goal of this paper is to give prospective users a better understanding of the possible types of observations, the data acquisition, and the sources that contribute to the instrument’s signal. Results. The paper discusses the science objectives, with a focus on the SPICE-specific aspects, before presenting the instrument’s design, including optical, mechanical, thermal, and electronics aspects. This is followed by a characterisation and calibration of the instrument’s performance. The paper concludes with descriptions of the operations concept and data processing. Conclusions. The performance measurements of the various instrument parameters meet the requirements derived from the mission’s science objectives. The SPICE instrument is ready to perform measurements that will provide vital contributions to the scientific success of the Solar Orbiter mission.

scholarly journals The Art of Surface Imaging

1991 ◽  
Vol 130 ◽  
pp. 309-320 ◽  
Author(s):  
N.E. Piskunov
Keyword(s):  
Inverse Problem ◽  
High Resolution ◽  
Stellar Atmosphere ◽  
High Resolution Spectroscopy ◽  
Regularization Methods ◽  
Problem Solution ◽  
Surface Imaging ◽  
Late Type ◽  
Inverse Problem Solution ◽  
Additional Constraints

AbstractWe intend to analyze the reliability of surface imaging of stars based on high resolution spectroscopy and the technique of inverse problem solution. Both astrophysical and mathematical aspects including different regularization methods are reviewed. The influence of the different factors on the resulting map is discussed and it is shown that the simultaneous use of different kinds of observational data (spectroscopy, photometry, polarimetry etc.) is very useful in providing additional constraints for the solution. The recent results in the surface imaging of Cp- and late-type stars show the way for further progress: the use of more adequate mathematical description of the stellar atmosphere and the simultaneous consideration of various surface inhomogeneities.

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