scholarly journals High Spatial/Spectral Resolution Studies of Eta Carinae

2005 ◽  
Vol 13 ◽  
pp. 799-801
Author(s):  
Theodore R. Gull ◽  
Keyword(s):  
Spectral Resolution ◽  
Large Scale ◽  
High Spectral Resolution ◽  
Space Telescope ◽  
X Ray ◽  
Eta Carinae ◽  
Imaging Spectrograph

AbstractWe have used the high spatial and high spectral resolution of the Space Telescope Imaging Spectrograph (STIS) to study Eta Carinae and the Homunculus. Since the last minimum in 1998.0, CCD spectral modes have followed changes in the Eta Carinae, and large-scale changes in the Homunculus. Since 2001.7, MAMA echelle-mode observations have followed changes in the Eta Carinae and the very nearby ejecta through the 2003.5 minimum. Very significant changes in the star and nebular occur as the X-Ray drop occurs in the minimum.

scholarly journals A High Spectral Resolution Observation of the Soft X‐Ray Diffuse Background with Thermal Detectors

2002 ◽  
Vol 576 (1) ◽  
pp. 188-203 ◽  
Author(s):  
D. McCammon ◽  
R. Almy ◽  
E. Apodaca ◽  
W. Bergmann Tiest ◽  
W. Cui ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
High Spectral Resolution ◽  
X Ray ◽  
Thermal Detectors ◽  
Resolution Observation ◽  
Diffuse Background

scholarly journals Goals for the Application of High-Resolution X-ray Spectroscopy to the Diagnosis of Stellar Coronal Plasmas

1990 ◽  
Vol 115 ◽  
pp. 94-109 ◽  
Author(s):  
Jeffrey L. Linsky
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
Transient Flow ◽  
Emission Measure ◽  
Active Regions ◽  
High Sensitivity ◽  
High Spectral Resolution ◽  
Spectral Features ◽  
Signal To Noise ◽  
X Ray

AbstractI provide examples of how high-resolution x-ray spectra may be used to determine the temperature and emission measure distributions, electron densities, steady and transient flow velocities, and location of active regions in stellar coronae. For each type of measurement I estimate the minimum spectral resolution required to resolve the most useful spectral features. In general, high sensitivity is required to obtain sufficient signal-to-noise to exploit the high spectral resolution. Although difficult, each measurement should be achievable with the instrumentation proposed for AXAF.

scholarly journals About diagnostics of Z-pinches hot points

2000 ◽  
Vol 18 (2) ◽  
pp. 291-296 ◽  
Author(s):  
V.Yu. POLITOV ◽  
A.V. POTAPOV ◽  
L.V. ANTONOVA
Keyword(s):  
Experimental Data ◽  
Theoretical Analysis ◽  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Electrical Discharges ◽  
Maximum Compression ◽  
X Ray ◽  
Average Temperature ◽  
Radiation Spectra ◽  
Spectral Intensities

We present the results of X-ray diagnostics of Z-pinch hot points, formed during fast electrical discharges through exploding Al wires. Experimental data include the pinhole images and X-ray time integrated radiation spectra. These spectra were obtained with high spectral resolution in the range 1.5–2.2 keV, contained the most intensive resonance lines of Al H- and He-like ions. Comparison of the recorded lines width and peak intensities with the corresponding modeled values, enables us to estimate the main hydrodynamical parameters of hot point, such as average temperature and density, being achieved at a moment of its maximum compression. Additionally, on the base of theoretical analysis of the spectral intensities distribution in well-resolved Lyα satellites, the gradient of compression velocities field is concluded. Some features of the investigated lines spectra forming are discussed.

scholarly journals High spectral resolution x-ray optics with highly oriented pyrolytic graphite

2006 ◽  
Vol 14 (10) ◽  
pp. 4570 ◽  
Author(s):  
H. Legall ◽  
H. Stiel ◽  
V. Arkadiev ◽  
A. A. Bjeoumikhov
Keyword(s):  
Spectral Resolution ◽  
Pyrolytic Graphite ◽  
High Spectral Resolution ◽  
Highly Oriented Pyrolytic Graphite ◽  
Ray Optics ◽  
X Ray

scholarly journals EVLA imaging of the water masers in the massive protostellar cluster NGC6334I

2012 ◽  
Vol 8 (S287) ◽  
pp. 502-503
Author(s):  
Todd R. Hunter ◽  
Crystal L. Brogan
Keyword(s):  
Spectral Resolution ◽  
Large Scale ◽  
High Spectral Resolution ◽  
Large Array ◽  
Maser Emission ◽  
Very Large Array ◽  
Broad Bandwidth ◽  
Molecular Lines ◽  
Water Masers ◽  
Spatial Kinematics

AbstractWe have used the recently-upgraded Karl G. Jansky Very Large Array (VLA) in A-configuration to observe the water masers in the massive protostellar cluster NGC6334I with broad bandwidth and high spectral resolution. Four groups of maser spots are found. The two groups with the broadest velocity span (40 km/s) are towards the UCHII region and the hot core SMA1. The spatial kinematics of the SMA1 masers are consistent in sense and orientation with the large-scale CO outflow and appear to trace the base of the outflow from a protostar at the dust peak of SMA1. Additional masers at the southern end of SMA1 provide evidence for a second protostar. The highest intensity maser lies about 2″ north of SMA1. Interestingly, no water masers are seen on the equally impressive hot core SMA2. Finally, we have detected maser emission toward the enigmatic source SMA4, which shows no millimeter molecular lines despite having strong, compact submillimeter continuum and may trace another protostar.

Sign in / Sign up

Export Citation Format

Share Document