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  • ASTRONOMY  (44)
  • SPACE SCIENCES  (18)
  • 1
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    The High Resolution Spectrograph for the Space Telescope (1982)
    In:  CASI
    Details
    Publication Date: 2009-11-16
    Description: The High Resoltuion Spectrograph (HRS) in conjunction with the Space Telescope (ST), extends ultraviolet astronomical spectroscopy to higher spectra, spatial, and time resolutions than previously achieved, as well as to fainter and more distant celestial objects. Other significant advances inherent in the instrument are high photometric accuracy and efficient operation via exposure meter control and real time rejection of bad data. These capabilities are provided to accomplish the scientific programs of the HRS investigation definition team, which concern the interstellar medium, stellar winds, and evolutionary aspects of stellar atmosphere studies; the determination of chemical abundances relevant to stellar evolution; the investigation of quasars and Seyfert galaxy nuclei; and the analysis of the atmospheres of solar system objects, including comets.
    Keywords: ASTRONOMY
    Type: Space Telescope Science Inst. The Space Telescope Obs.; p 76-105
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  • 2
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    One- and multi-component models of the upper photosphere based on molecular spectra. II - CN/1, 1/ of the CN violet system (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: SPACE SCIENCES
    Type: Solar Physics; 35; Apr. 197
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  • 3
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    One- and multi-component models of the upper photosphere based on molecular spectra. I - The violet system of CN /0, 0/ (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Spectroheliograms taken in the CN (0, 0) violet band near 3883 A show very small scale network and cell structures with high contrast. The bandhead itself, which is a broad feature due to overlap of several CN lines, allows the diagnostic simplicity of a continuum since motions, magnetic fields, and broadening mechanisms are unimportant. We have obtained spectroheliograms in the bandhead and center-to-limb photoelectric spectra of CN (0, 0) at Kitt Peak National Observatory. From the photoelectric spectra and a detailed analysis of the formation of the CN (0, 0) spectrum we derive a best-fit one-component upper photospheric model differing from that of the HSRA and recommend a change in solar carbon abundance from the HSRA value.
    Keywords: SPACE SCIENCES
    Type: Solar Physics; 32; Sept
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  • 4
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    High-spectral-resolution measurements of the H I 1216 and Mg II 2800 emissions from Arcturus (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: High-spectral-resolution scans of H I 1216 and Mg II 2796, 2803 obtained using the ultraviolet spectrometer abroad the Copernicus satellite show broad and very asymmetrical emission profiles. The ratio of the line widths to the solar values is consistent with a law similar to the Wilson-Bappu relation for the calcium K reversal. A fit of the interstellar absorption profile indicates that the average H density toward this nearby star is low, 0.02-0.1 per cu cm.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 188; Mar. 15
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  • 5
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    The moon as a proposed radiometric standard for microwave and infrared observations of extended sources. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Measured values of the average midnight and morning terminator infrared brightness temperatures of the central portion of the lunar disk can quite accurately determine the mean surface temperature despite likely horizontal and vertical inhomogeneities of the thermal properties of the lunar soil. These data together with laboratory measurements on lunar soil and in situ temperature measurements in and on the lunar surface lead to a mean surface temperature of 220.5 K plus or minus 2.5 per cent and a mean temperature 35 K hotter at a depth of 1 m. The monthly average brightness temperature is then estimated as a function of wavelength between 10 microns and 100 cm taking into account likely temperature dependencies of the thermal conductivity and loss tangent, and the variation of emissivity with wavelength.
    Keywords: SPACE SCIENCES
    Type: vol. 25; Feb. 197
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  • 6
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    High dispersion far ultraviolet spectra of cool stars (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Recent far ultraviolet high dispersion spectra of two cool supergiant stars, Beta Dra (G2 Ib) and Alpha Ori (M2 Iab) are examined in the context of current questions regarding stellar chromospheres, coronae and mass loss. These stars show very different outer atmosphere structure. Beta Dra has a geometrically thin transition region with bright emission lines of 100,000 K plasma that are red-shifted, indicating downflow in magnetic flux tubes. By contrast, Alpha Ori has a cool extended chromosphere and circumstellar envelope with large mass loss.
    Keywords: ASTRONOMY
    Type: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 259-262
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  • 7
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    On the correlation between chromospheric and coronal emission (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: It is shown that with increasing stellar activity the emission of the transition region and corona increases faster than the emission of the chromosphere. It is also explained why the pressure of the transition region increases with increasing stellar activity. Further, it is shown that this relation is a necessary requirement for the global stability of the chromosphere/transition region/corona system.
    Keywords: ASTRONOMY
    Type: NASA. Goddard Space Flight Center Advan. in Ultraviolet Astron.; p 268-272
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  • 8
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    Stellar model chromospheres. II - Procyon /F5 IV-V/ (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Derivation of a model for the chromosphere and upper photosphere of Procyon (F5 IV-V) based on calibrated observations of the K and 8542-A lines of Ca II, the k(2796-A) line of Mg II, and the K-line wings. The feasibility of this model synthesis approach to derive a preliminary model chromosphere is demonstrated despite the lack of spatial and spectral resolution associated with solar chromospheric studies. The proposed upper photosphere model is very similar to the radiative equilibrium Procyon model of Strom and Kurucz (1966), while the proposed chromospheric model is similar to the quiet solar chromosphere temperature distribution of Shine (1973) in the 6000 to 8000 K range.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 192; Aug. 15
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  • 9
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    IUE's legacy for the future: The final archive and goals for its implementation (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Requirements for the IUE archive, and how the signal/noise (S/N) ratio in photometrically corrected images can be enhanced considerably by cross-correlating the fixed pattern in a data image with that in a suitable flat-field image are described. From these cross-correlations it is feasible to derive an accurate geometrical correction to apply to the data image before applying the intensity transfer functions. The standard IUE processing software does not generate a sufficiently accurate geometric correction so that typical spatial errors of 1 to 2 pixels conspire with the large fixed pattern in raw images to produce significant misregistration noise. Tests on flat-field images demonstrate that an explicit geometric correction procedure can avoid most of the misregistration noise and can thereby improve the S/N ratio of IUE data by factors of 1.5 to 2.4.
    Keywords: ASTRONOMY
    Type: ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2; p 391-395
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  • 10
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    IUE study of the very local interstellar medium (1986)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: The IUE and Copernicus results for the very local interstellar medium are compared. Despite its lower resolution, IUE produces results of comparable quality, giving important confirmation of Copernicus results on the density, temperature, turbulence, and deuterium-to-hydrogen ratio in the region within 10 pc of the Sun. The stars observed are in a very low-density quarter of the galaxy: multicomponent structure seen in other directions may not be present in the direction of most of the observed stars. The exceedingly low densities observed in certain directions encourages the idea that EUV studies of certain normal stars may be possible.
    Keywords: ASTRONOMY
    Type: ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE; p 555-558
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