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  • ASTRONOMY  (52)
  • 2020-2024
  • 1985-1989  (52)
  • 1955-1959
  • 1985  (52)
  • 1
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    Aperture synthesis using orbiting telescopes (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A study was carried out to determine the feasibility, with current technology, of performing aperture synthesis using two telescopes orbiting the earth in coordinated orbits separated by approximately 10 m to 1 km. The objective was to determine whether there is a practical alternative to a very large, deployed, servo-controlled submillimeter telescope (i.e., the Large Deployable Reflector) for obtaining high-resolution submillimeter images of astronomical sources. It is found that suitable classes of orbits exist which can provide good UV coverage over the entire sky and the real-time correlation of wideband signals can be performed in orbit using current technology. The most difficult task appears to be the real-time determination of the orientation of the baseline vector in a stable coordinate system. A plausible scheme has been identified for the determination of an arbitrary direction to within 0.003 arcsec in an astrometric coordinate system. This scheme not only makes submillimeter interferometric image reconstruction possible but should also have numerous other applications.
    Keywords: ASTRONOMY
    Type: Radio Science (ISSN 0048-6604); 20; 1105-111
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  • 2
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    Soft X-ray maps of the Large Magellanic Cloud (LMC) (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Soft X-ray maps of the Large Magellanic Cloud (LMC) were obtained from scanning-observations with the HEAO-1 low energy detectors. Comparison of the 1/4 keV X-ray observations with the neutral hydrogen column densities in the LMC obtained from a 21 cm line survey, shows no evidence for absorption effects in the 1/4 keV X-ray flux from the LMC due to the neutral matter in the LMC. Instead, faint X-ray emission is detected from the LMC. The extent of this emission is smaller than the size of the halo or the disk of the LMC. Assuming this 1/4 keV emission to be diffuse, it is identified with a supergiant shell of optical nebulosity known as Shapley III, and the bar of the LMC. The X-ray luminosities of the regions are estimated to be 9 times 10 to the 38th power ergs/sec and 1.8 times 10 to the 39th power ergs/sec for the Shapley III region and the bar of the LMC respectively. Shapley III could be an X-ray superbubble.
    Keywords: ASTRONOMY
    Type: ESA Proceedings of ESA Workshop on a Cosmic X-Ray Spectroscopy Mission; p 131-136
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  • 3
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    Observations of far-infrared transitions between excited states of OH (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In observations of the Kleinmann-Low Nebula were detected of Orion 84.42 and 84.60 micron transitions between the P-2 sub 3/2 and Pi-2 sub 3/2 (J = 5/2) levels of OH with respective fluxes of 1.0 + or - 0.3 to the minus 17th power and 1.4 + or - 0.4 x 10 to the minus 17th power W cm/sq. When compared to 119 micron flux levels of OH and 153 micron flux levels of these radicals by Viscuso, these results suggest appreciable self-absorption of OH line radiation within the Nebula. It is probable that the CO emission due to the J = 31 yields 30 rotational transition at 84.411 micron makes a substantial contribution to the observed 84.42 micron flux, and that it also is at least partially absorbed at the 84.42 micron OH transition frequency. The 88.55 and 88.78 micron (J = 9/2 to 7/2) transitions of CH also were sought, but yielded only to upper limits of 3 x 10 to the minus 18th power W /sq cm each. A search of W3-IRS5 yields upper limits to the 84.42 micron OH and 87.19 micron CO (J = 30 to 29) transitions of 2 x 10 minus 18th power W cm/2.
    Keywords: ASTRONOMY
    Type: NASA-TM-86722 , REPT-85223 , NAS 1.15:86722
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  • 4
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    X-ray observations of possible binary clusters of galaxies (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Many studies of superclusters of galaxies have been conducted, taking into account also superclusters representing candidate binary cluster systems. The present investigation is concerned with further studies of potential binary cluster systems, giving attention to a sample of six cluster pairs, in which the redshifts and X-ray luminosities of each member of a pair have been measured. One of the objectives of the investigation was related to a search for X-ray evidence that the clusters interact in these potentially binary systems. A second objective was to provide a measure of the mass of hot gas in the clusters. Two new systems in which the two clusters may have a physical association were found.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 290; 551-556
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  • 5
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    Combined ultraviolet studies of astronomical source (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: As part of its Ultraviolet Studies of Astronomical Sources the Smithsonian Astrophysical Observatory for the period 1 Feb. 1985 to 31 July 1985 observed the following: the Cygnus Loop; oxygen-rich supernova remnants in 1E0102-72; the Large Magellanic Cloud supernova remnants; P Cygni profiles in dwarf novae; soft X-ray photoionization of interstellar gas; spectral variations in AM Her stars; the mass of Feige 24; atmospheric inhomogeneities in Lambda Andromedae and FF Aquarii; photometric and spectroscopic observation of Capella; Alpha Orionis; metal deficient giant stars; M 67 giants; high-velocity winds from giant stars; accretion disk parameters in cataclysmic variables; chromospheric emission of late-type dwarfs in visual binaries; chromospheres and transient regions of stars in the Ursa Major group; and low-metallicity blue galaxies.
    Keywords: ASTRONOMY
    Type: NASA-CR-176165 , NAS 1.26:176165 , SAPR-10
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  • 6
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    Combined ultraviolet studies of astronomical sources (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Ultraviolet studies of various astronomical entities are reported. Among the specific phenomena examined were supernova remnants, dwarf novae, red giant stars, stellar winds, binary stars, and galaxies.
    Keywords: ASTRONOMY
    Type: NASA-CR-174361 , NAS 1.26:174361 , SAPR-9
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  • 7
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    Comet Encke - Gas production and lightcurve (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A comprehensive set of observations, both from the ground and with the IUE, was planned for the 1984 apparition of Comet Encke. The observations were intended to confirm the behavior seen in 1980 and to study the behavior of the comet after perihelion. The results of the observations indicate that all the measured trace species display an asymmetry around the perihelion that is consistent with the visual light curve (VLC). But the total gas production as monitored by OH (the dominant species) displays a behavior that has no relation to the VLC.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 64; 1-10
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  • 8
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    Prospects for astrometry with the Hubble Space Telescope (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Hubble Space Telescope (HST), a large optical telescope having an aperture of 2.4 meters and a length of 8.8 meters, is being developed by NASA. This telescope will be placed into earth orbit by the Space Shuttle. Astrometric observations with the HST are made using a Fine Guidance Sensor which is capable of measuring the position of one object relative to another with an accuracy of + or - 0.002 arcseconds. The astrometric user of HST will be provided with an Astrometric Data Reduction Software package. The variety of astrometric problems to be investigated with HST is discussed.
    Keywords: ASTRONOMY
    Type: Celestial Mechanics (ISSN 0008-8714); 37; 299-305
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  • 9
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    Institutional arrangements for the space telescope: A mid-term review (1985)
    In:  CASI
    Details
    Publication Date: 2005-03-01
    Keywords: ASTRONOMY
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  • 10
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    The identification of H2311 + 77 with HD220140, a probable RS CVn star (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: H2311 + 77, one of the bright soft X-ray sources in the sky originally detected with HEAO 1, has been identified in an Exosat imaging observation with a 7.7-mag late-type star, HD220140. The X-ray luminosity and the optical characteristics of this star indicate that it is probably an RS CVn binary system.
    Keywords: ASTRONOMY
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 215; 11P-13P
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