scholarly journals Non-Equilibrium Ionization in Puppis A

1983 ◽  
Vol 101 ◽  
pp. 245-252
Author(s):  
P. F. Winkler ◽  
C. R. Canizares ◽  
B. C. Bromley
Keyword(s):  
High Resolution ◽  
Spectroscopic Data ◽  
Supernova Remnant ◽  
Optical Data ◽  
Equilibrium Conditions ◽  
X Ray ◽  
Flux Measurements ◽  
Far From Equilibrium ◽  
Einstein Observatory ◽  
Non Equilibrium

High resolution X-ray spectroscopy of the brightest knot of emission in the Puppis A supernova remnant shows that it is made up of ionizing plasma, far from equilibrium. Flux measurements in several X-ray lines enable us to determine the non-equilibrium conditions: electron temperature, ion populations, and time since the knot was heated by the supernova shock. Imaging and spectroscopic data from the Einstein Observatory together suggest that this knot is a cloud of density about 10 cm−3 which has recently been shocked to a temperature 7 × 106 K. Radio and optical data on the region appear consistent with this picture.

scholarly journals N49: The Site of a Gamma-ray Burst. Preliminary Results from X-ray Observations

1983 ◽  
Vol 101 ◽  
pp. 573-577
Author(s):  
G. Pizzichini ◽  
T. L. Cline ◽  
U. D. Desai ◽  
B. J. Teegarden ◽  
W. D. Evans ◽  
...  
Keyword(s):  
High Resolution ◽  
Supernova Remnant ◽  
Gamma Ray ◽  
Large Magellanic Cloud ◽  
X Rays ◽  
Radio Image ◽  
Gamma Ray Burst ◽  
X Ray ◽  
Preliminary Results ◽  
Einstein Observatory

The error box of the unusual Gamma-Ray Burst of March 5, 1979 falls completely inside the optical and radio image of the Supernova Remnant N49 in the Large Magellanic Cloud. This region was observed twice in x-rays with the High Resolution Imager of the Einstein Observatory, six weeks and nearly two years after the Gamma-Ray Burst. We show the comparison between the two observations.

High-resolution X-ray observations of the Cassiopeia A supernova remnant with the Einstein Observatory

1979 ◽  
Vol 234 ◽  
pp. L69 ◽  
Author(s):  
S. S. Murray ◽  
G. Fabbiano ◽  
A. Epstein ◽  
R. Giacconi ◽  
A. C. Fabian
Keyword(s):  
High Resolution ◽  
Supernova Remnant ◽  
X Ray ◽  
Cassiopeia A ◽  
Einstein Observatory

scholarly journals The X-ray Structure of the Supernova Remnant G78.2+2.1

1983 ◽  
Vol 101 ◽  
pp. 281-286
Author(s):  
L. A. Higgs ◽  
T. L. Landecker ◽  
F. D. Seward
Keyword(s):  
Supernova Remnant ◽  
The South ◽  
X Ray ◽  
South Eastern ◽  
Einstein Observatory

The south-eastern portion of the supernova remnant G78.2+2.1, in Cygnus, has been detected as a weak X-ray source by the Einstein Observatory. The X-ray structure is similar to that of the radio filaments in this region, and confirms that X-ray emission in this portion of the “Cygnus super-bubble” does originate in a known supernova remnant. Marginally significant variations in X-ray hardness across the mapped area have been detected and can be related to known radio and optical features of the remnant. In its X-ray properties, G78.2+2.1 resembles IC443.

scholarly journals X Sources in δ Scuti Stars: an Ultraviolet Study of 71 Tau

1993 ◽  
Vol 139 ◽  
pp. 396-396
Author(s):  
L.E. Pasinetti Fracassini ◽  
L. Pastori ◽  
F. De Nile ◽  
E. Poretti ◽  
E. Antonello
Keyword(s):  
Mass Loss ◽  
Spectroscopic Data ◽  
Pulsation Period ◽  
X Ray ◽  
Chromospheric Activity ◽  
Hyades Cluster ◽  
Photometric Observations ◽  
Scuti Stars ◽  
Einstein Observatory ◽  
Δ Scuti Stars

IUE observations of δ Scuti variables were planned to study the correlations between chromospheric activity and dynamics of pulsations, convection, rotation and to search for evidence of mass loss. So far we observed the following stars: ρ Pup, β Cas, o1 Eri, K2 Boo, τ Peg, 69 Tau, 71 Tau and τ Cyg. Results and discussions on our survey may be found in Pasinetti Fracassini et al. (1990) and Fracassini et al. (1991).Ultraviolet spectroscopic data (6 LWP and 3 SWP spectra) of 71 Tau were obtained with IUE in the year 1990, spanning an interval of 5h35rn and covering about 1.5 cycles of the pulsation period. The period, derived from new photometric observations, is 4h32m with an cimplitude of 0m.028. This variable is the most intense X-ray source in the Hyades cluster according to the results of Einstein Observatory.

scholarly journals Detailed X-ray Observations of the Cygnus Loop

1983 ◽  
Vol 101 ◽  
pp. 253-260
Author(s):  
W. H.-M. Ku ◽  
K. Long ◽  
R. Pisarski ◽  
M. Vartanian
Keyword(s):  
High Resolution ◽  
Proportional Counter ◽  
Supernova Remnant ◽  
Sounding Rocket ◽  
Loop Structure ◽  
High Quality ◽  
Radio Structure ◽  
X Ray ◽  
Cygnus Loop ◽  
Spatially Resolved

High quality X-ray spectral and imaging observations of the Cygnus Loop have been obtained with three different instruments. The High Resolution Imager (HRI) on the Einstein Observatory was used to obtain arcsecond resolution images of select bright regions in the Cygnus Loop which permit detailed comparisons between the X-ray, optical, and radio structure of the Loop. The Imaging Proportional Counter (IPC) on the Einstein Observatory was used to obtain an arcminute resolution map of essentially the full Loop structure. Finally, an Imaging Gas Scintillation Proportional Counter (IGSPC), carried aloft by a sounding rocket last fall, obtained modest resolution, spatially resolved spectrophotometry of the Cygnus Loop. An X-ray map of the Loop in the energy of the 0 VIII line was obtained. These data combine to yield a very powerful probe of the abundance, temperature, and density distribution of material in the supernova remnant, and in the interstellar medium.

The mass of Tycho's supernova remnant as determined from a high-resolution X-ray map

1983 ◽  
Vol 266 ◽  
pp. 287 ◽  
Author(s):  
F. Seward ◽  
P. Gorenstein ◽  
W. Tucker
Keyword(s):  
High Resolution ◽  
Supernova Remnant ◽  
X Ray

scholarly journals Non-Equilibrium Thermal X-Ray Emission in the Early Phase of Supernova Remnant

1989 ◽  
Vol 8 ◽  
pp. 217-221
Author(s):  
Hitoshi Hanami ◽  
Tatsuo Yoshida
Keyword(s):  
Early Phase ◽  
Supernova Remnant ◽  
Circumstellar Matter ◽  
Temperature Model ◽  
X Ray ◽  
Two Temperature ◽  
Non Equilibrium

AbstractThe X-ray emission from the interaction of the ejecta with circumstellar matter (CSM) for SN1987A is investigated. The electron and the ion temperatures seem to be in non-equilibrium in the early phase of a SN remnant. We have studied the two-temperature model in the early phase of SNR and discuss the X-ray emission from SN1987A and its CSM.

scholarly journals The Mass and Structure of the Remnant of Tycho's Supernova

1983 ◽  
Vol 101 ◽  
pp. 1-15 ◽  
Author(s):  
Paul Gorenstein ◽  
Frederick Seward ◽  
Wallace Tucker
Keyword(s):  
Total Mass ◽  
Column Density ◽  
Supernova Remnant ◽  
Average Density ◽  
Equilibrium Calculation ◽  
Free Expansion ◽  
X Ray ◽  
Upper Limit ◽  
Interstellar Material ◽  
Einstein Observatory

A high resolution X-ray image of Tycho's supernova remnant obtained from the Einstein Observatory reveals three components of X-ray emission that we identify with shocked interstellar material, diffuse ejecta, and clumpy ejecta. This picture is applied to derive the mass of X-ray emitting material. Assuming a distance of 3 kpc, an absorbing column density of 3 × 1021 atoms/cm2, and using an ion-electron non-equilibrium calculation for the emissivity, we find the average density of the ISM is 0.4 atoms/cm3, and the energy contained in the remnant is 1.4 × 1051 ergs. The total mass of X-ray emitting material in the remnant is ≈4 M⊙, ≈2 M⊙ ejecta and ≈2 M⊙ swept up, putting the remnant at an intermediate state between a free expansion and the Sedov phase. There is no evidence for neutron star. The upper limit on the surface temperature is in the range 1.1 to 1.8 × 106K.

X-Ray Structure Analysis and Spectroscopic Data of the Antibiotic 8-(Dichloroacetyl)-5-hydroxy-2,7-dimethyl-1,4-naphthoquinone from the Fungus Mollisia sp.*

1987 ◽  
Vol 42 (1-2) ◽  
pp. 1-3 ◽  
Author(s):  
Gabriela Weber ◽  
Thomas Hübner ◽  
Alfred Gieren ◽  
Johann Sonnenbichler ◽  
Tadeusz Kowalski ◽  
...  
Keyword(s):  
High Resolution ◽  
Structure Analysis ◽  
Spectroscopic Data ◽  
Mass Spectra ◽  
Nmr Spectra ◽  
X Ray ◽  
H Nmr

Abstract Mass spectra, X-ray data and high resolution 13C and 1H NMR spectra of 8-(dichloroacetyl)-5-hydroxy-2,7-dim ethyl-1,4-naphthoquinone are reported. The antibiotic active com pound was isolated from the fungus Mollisia sp.

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