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  • 1
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    A search for 183-GHz emission from water in late-type stars (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A search was made for 183 GHz line emission from water vapor in the direction of twelve Mira and two semiregular variables. Upper limits to the emission are in the range of 2000 to 5000 Jy. It is estimated that thermal emission from the inner regions of late type stellar envelopes will be on the order of ten Jy. Maser emission, according to one model, would be an order of magnitude stronger. From the limited set sampled, the possibility of very strong maser emission at 183 GHz cannot yet be ruled out.
    Keywords: ASTRONOMY
    Type: NASA-TM-85987 , A-9825 , NAS 1.15:85987
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    183 GHz water line variation: An energetic outburst in orion KL (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Observations of the 3(13)-2(20) transition of water vapor in the direction of Ori MC1 in 1980 February show a 50% flux increase and an apparent additional red shift of approximately 2 km/s relative to the line observed in 1977 December. From a detailed examination of the amplitude and frequency calibration, it appears unlikely that the effect is due to systematic error. The increase is attributed to the appearance of a new component at a velocity of 12 km/s with respect to the local standard of rest. The new component also has broad wings. Increased emission from a region in the high-velocity core of Ori MC1 can be due either to additional far-IR radiation to pump the 1983 GHz transition or to a change in the physical conditions in the gas. Statistical equilibrium calculations using the large-velocity-gradient formalism were carried out to develop a model for the emission. The calculations support a model in which the gas in the region of enhanced emission is hotter than the dust. The temporal coincidence between the 183 GHZ increase and the 22 GH1 water maser outburst suggests a common, impulsive cause, which has heated the gas in a part of the HV source, enhancing the emission in both transitions.
    Keywords: ASTRONOMY
    Type: NASA-TM-85956 , A-9766 , NAS 1.15:85956
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Perception for a large deployable reflector telescope (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Optical science and technology concepts for a large deployable reflector for far-infrared and submillimeter astronomy from above the earth's atmosphere are discussed. Requirements given at the Asilomar Conference are reviewed. The technical challenges of this large-aperture (about 20-meter) telescope, which will be diffraction limited in the infrared, are highlighted in a brief discussion of one particular configuration.
    Keywords: ASTRONOMY
    Type: Advanced technology optical telescopes II; September 5, 6, 1983; London
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Plans for a large deployable reflector for submillimeter and infrared astronomy from space (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Continuing plans for a large deployable reflector (LDR), conceived as a 10- to 30-m-diameter clear-aperture telescope, operating at wavelengths from 1000 microns to a diffraction-limited 30 microns, and to be placed in orbit for a life of 10 years by the Space Shuttle, are discussed. The primary reflector will be composed of a number of closely packed hexagonal segments of glass or lightweight composite material and attached to a truss integrating structure through position actuators providing three degrees of freedom for each segment. Technical aspects of optical design, surface measurement systems, deployment, and detectors are discussed, as are practical and fiscal limitations.
    Keywords: ASTRONOMY
    Type: International Conference on Advanced Technology Optical Telescopes; Mar 11, 1982 - Mar 13, 1982; Tucson, AZ
    Format: text
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  • 5
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    A concept for an orbiting submillimetre-infrared observatory (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A large submillimeter and far infrared orbiting astronomical observatory were designed. The operating wavelength will be between 1 mm (1000 micro m) and 30 micro m. The short wavelength limit is a compromise between the point where smaller, cooled telescopes become more sensitive and practical technology. The short wavelength limit may be increased if the tradeoff between cost and scientific return is advantageous.
    Keywords: ASTRONOMY
    Type: ESA The Sci. Importance of Submillimetre Observations; p 99-105
    Format: text
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  • 6
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    A technology program for the development of the large deployable reflector for space based astronomy (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Technologies for the development of the Large Deployable Reflector (LDR), a NASA project for the 1990's, for infrared and submillimeter astronomy are presented. The proposed LDR is a 10-30 diameter spaceborne observatory operating in the spectral region from 30 microns to one millimeter, where ground observations are nearly impossible. Scientific rationales for such a system include the study of ancient signals from galaxies at the edge of the universe, the study of star formation, and the observation of fluctuations in the cosmic background radiation. System requirements include the ability to observe faint objects at large distances and to map molecular clouds and H II regions. From these requirements, mass, photon noise, and tolerance budgets are developed. A strawman concept is established, and some alternate concepts are considered, but research is still necessary in the areas of segment, optical control, and instrument technologies.
    Keywords: ASTRONOMY
    Type: AIAA PAPER 82-1850 , Technology for Space Astrophysics Conference: The Next 30 Years; Oct 04, 1982 - Oct 06, 1982; Danbury, CT
    Format: text
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  • 7
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    A large-aperture space telescope for infrared and submillimeter astronomy (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Large Aperture Telescope (LAT), which will have a diameter of 10-30 m and will operate in the 2-1000 micron wavelength range, is described. It is noted that the LAT could be carried into orbit with a single launch of the Space Transportation System and semiautomatically deployed as a free flyer with a nominal 10-yr mission duration. Servicing and instrument changes would be made at 2-yr intervals. It is pointed out that the LAT would have to be placed above the earth's atmosphere to avoid both the absorption that occurs through much of the infrared and submillimeter and the turbulence which limits spatial resolution. Important technical considerations for the LAT are discussed; they include the telescope optical form, the primary mirror material, figure control techniques, the deployment techniques, and thermal control. The science objectives and rationale for the LAT are discussed and various hardware techniques and concepts for its implementation are described.
    Keywords: ASTRONOMY
    Type: Seminar on Active optical devices and applications; Apr 10, 1980 - Apr 11, 1980; Washington, DC
    Format: text
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