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  • 1
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    Alterations in transthoracic electrical impedance with acute intravascular overload (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Alterations in transthoracic electrical impedance with acute intravascular overload and pulmonary edema
    Keywords: BIOSCIENCES
    Type: MINN. UNIV. DEVELOP. AND EVALUATION OF AN IMPEDANCE CARDIOGRAPHIC SYSTEM TO MEAS. CARDIAC OUTPUT AND OTHER CARDIAC PARAMETERS 30 JUN. 1969; P 78-96
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  • 2
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    Current NASA studies for a Far Ultraviolent Spectrographic Explorer (FUSE) (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The NASA plans for FUSE, a satellite which obtains spectra with resolutions between 100,000 and 100 in the spectral regions from 912 to 1216A and 100 to 912A, are outlined. Scientific problems which can be tackled by FUSE, but not by IUE or the Space Telescope, are discussed. A grazing incidence echelle and a hybrid echelle design are presented. They have high throughput, large simultaneous spectral range, and low background photon counting statistics. The satellite operational organization is similar to that of IUE.
    Keywords: ASTRONOMY
    Type: ESA 3rd European IUE Conf.; p 473-485
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  • 3
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    A survey of ultraviolet interstellar absorption lines (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A telescope-spectrometer on the Copernicus spacecraft made possible the measurement of many ultraviolet absorption lines produced by the interstellar gas. The present survey provides data on ultraviolet absorption lines in the spectra of 88 early-type stars. The stars observed are divided into four classes, including reddened stars, unreddened bright stars, moderately reddened bright stars, and unreddened and moderately reddened faint stars. Data are presented for equivalent width, W, radial velocity V, and rms line width, D, taking into account some 10 to 20 lines of N I, O I, Si II, P II, S II, Cl I, Cl II, Mn II, Fe II, Ni II, Cu II, and H2. The data are based on multiple scans for each line. Attention is given to details of observations, the data reduction procedure, and the computation of equivalent width, mean velocity, and velocity dispersion.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal Supplement Series; 51; Mar. 198
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  • 4
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    A compressed cloud in the Vela supernova remnant (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Strong interstellar absorption lines of C I, arising from the two excited fine-structure levels, are found in IUE observations of HD 72350 (type B4 III). An analysis of the excited-level populations of C I gives local temperature and pressure limits, and auxiliary data on the limit of column density for excited O I and the carbon ionization help to establish that (1) the local temperature is within the limits of 25-100 K, and (2) the pressure/Boltzmann's constant ratio is at least 10 to the 4.3/cu cm K, despite its small size. This high-pressure cloud is discussed in terms of shock compression by the Vela supernova blast wave, along with the relationship of this kind of cloud compression to star formation and to the origin of the characteristic filamentary emission arcs seen in Vela and other supernova remnants
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 248
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  • 5
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    Rocket-ultraviolet spectra of kappa, lambda, tau, and upsilon Scorpii (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The present work describes high- and low-resolution rocket-ultraviolet spectra of kappa, lambda, tau, and upsilon Scorpii obtained in the range from 1160 to 1880 A. The Si IV resonance lines in tau Sco show asymmetries indicating outward mass motions of up to about 400 km/sec. The suitability of some of the lines observed for indication of luminosity or temperature is discussed. It is pointed out that the intrinsic strength and large changes of the lines of Si III and C IV may permit a more accurate spectral classification of stars between B0 and B3 than has been demonstrated in this same spectral type region using visible spectra.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 194; Nov. 15
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  • 6
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    Ultraviolet absorption lines associated with the Vela supernova remnant (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Two stars behind the Vela supernova remnant and two stars offset from the remnant have been observed with the UV spectrometer aboard the Copernicus satellite. Over 200 interstellar atomic and molecular absorption features between 1000 and 1400 A have been identified and measured for radial velocity and equivalent width. In many cases, additional information was obtained by studying the detailed shapes of the recorded profiles. Most of the stars show several absorption components, with clouds of the highest radial velocity appearing in the spectra of stars behind the remnant. For each component, column densities were derived using velocity dispersion parameters which yielded the most self-consistent results. Qualitatively, the gas toward the remnant exhibits a number of unusual properties, when compared with normal interstellar material. First, abnormally high radial velocities were evident. Second, the degree of ionization of some elements suggested the existence of ionizing processes significantly more potent than those found in general regions of space. Finally, an investigation of electron densities shows that much of the gas, especially that at high velocity, must exist in the form of relatively thin sheets or filaments. If cosmic abundances prevail, the column densities of high-velocity excited material suggest that H-alpha emission measures could be as large as 100 sq cm/cu pc.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal Supplement Series; 32; Dec. 197
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  • 7
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    A catalog of 0.2 A resolution far-ultraviolet stellar spectra measured with Copernicus (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Spectra between 1000 and 1450 A for 60 O- and B-type stars observed by Copernicus at 0.2-A resolution are presented in three forms: tables containing the numerical data, plots showing renormalized spectra, and synthetic photographic spectra. The data have been corrected for all instrument effects of importance for the photometric accuracy except fluctuations in continuum level caused by small variations in spacecraft guidance. Spectrometer sensitivity curves are provided for use in converting to absolute fluxes. It is expected that this catalog will be of use for research on many aspects of stellar UV spectra, including spectral classification, line identification, abundance determinations, spectrum synthesis, model atmosphere calculations, flux distributions, bolometric corrections, stellar winds, and mass loss.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal Supplement Series; 33; Mar. 197
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  • 8
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    Coronal gas in the Galaxy. I - A new survey of interstellar O VI (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Ultraviolet spectra of 40 O- and B-type stars have been intensively scanned in the vicinity of the O VI transitions at 1032 and 1038 A with the Copernicus satellite. This survey of the high-temperature (log T about 5.5) phase of interstellar gas is an extension of the earlier observations of interstellar O VI by Jenkins and Meloy (1974), bringing the total coverage up to 72 stars. Except for a few distant stars, the overall quality of the present data surpasses that of the earlier work. Plots of absorption optical depths versus radial velocity are presented for both transitions in each star. Total column densities (or their upper limits), velocity centroids, and velocity widths have been extracted from the profiles and tabulated, with the results of Jenkins and Meloy (1974) included. Qualitatively, the highly variable O VI densities and velocities seem to exhibit no systematic patterns or regional trends; there is no recognizable correlation in the behavior of coronal gas with pronounced features of galactic structure.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 219
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  • 9
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    Lyman-alpha observations of Comet Kohoutek 1973 XII with Copernicus (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Comet Kohoutek 1973 XII was observed with a telescope-spectrometer on the Copernicus satellite on six occasions over a 1-month period starting on January 29, 1974. Positive detection of the cometary Ly-alpha emission profile was obtained on January 29 and February 2. Earlier observations of the geocoronal Ly-alpha emission profile allowed an instrumental intensity calibration and confirmation of the computed instrumental profile for an extended source at the Ly-alpha wavelength. After allowing for broadening by the instrument, a hydrogen-outflow velocity of about 10.6 km/s is derived from the width of the Ly-alpha emission on January 29. The intensity calibration combined with an appropriate cometary model led to cometary water-production rates for January 29 and February 2. Only upper limits were obtained for Ly-alpha on and after February 14. Searches for OH and D led to negative results.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 209; Oct. 1
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