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  • ASTRONOMY  (1,733)
  • 1980-1984  (1,733)
  • 1
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    Observations of normal main-sequence and giant B stars (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: When interpreting the continuous and line spectra of B stars, it is helpful to think in terms of a model consisting of a photosphere and a mantle which is the outer part of the atmosphere where the effects of nonradiative heating are seen. A survey of the spectra of these stars shows that conditions in the photosphere determine most of what is seen, and in the case of most B stars, the presence of the mantle can be detected only by a special effort. The shape of the visible continuum spectrum and the shape and absolute value of the UV continuous spectrum as determined from low resolution spectra are discussed. Effective temperature for B stars in the main sequence, including corrections for interstellar extinction and bolometric corrections are explored. The major constituents of B-type spectra, variation of the strength of line along the main sequence band, the UV spectra, UV line blocking, intrinsic colors, and variations in light and spectra are also examined.
    Keywords: ASTRONOMY
    Type: B Stars With and Without Emission Lines, Parts 1 and 2; p 39-77
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    High Energy Astronomy Observatory (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An overview of the High Energy Astronomy Observatory 2 contributions to X-ray astronomy is presented along with a brief description of the satellite and onboard telescope. Observations relating to galaxies and galactic clusters, black holes, supernova remnants, quasars, and cosmology are discussed.
    Keywords: ASTRONOMY
    Type: NASA-EP-167
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Space telescope (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The Space Telescope is discussed. The spacecraft, science instruments, deployment, the Space Telescope Science Institute, and astronomy are discussed.
    Keywords: ASTRONOMY
    Type: NASA-EP-166 , NAS 1.19:166
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Astronomical facilities for Spacelab (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Three significant Spacelab facilities which are being developed, or planned by NASA will use the 1-2 week observational capability for attached payloads on Shuttle to carry out advanced astronomical observations in the ultraviolet visible, and infrared spectral regions during the decade of the 1980s. The three facilities are expected to evolve in capability over several Shuttle flights with a final objective of protracted observational capability from a permanent facility in space with periodic servicing and/or retrieval. The three facilities are the Office of Space Science package (OSS-3/7), the Solar Optical Telescope (SOT), and the Shuttle Infrared Telescope Facility (SIRTF). The scientific and technical objectives of these astronomical facilities include both their current and projected capabilities, their use of the manned Shuttle, and their eventual disposition to a long-term facility. International aspects of the missions, including General Investigator programs, are also being planned.
    Keywords: ASTRONOMY
    Type: IAF PAPER 82-25
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Determination of the observation conditions of celestial bodies with the aid of the DISPO system (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The interactive system for determining the observation conditions of celestial bodies is described. A system of programs was created containing a part of the DISPO Display Interative System of Orbit Planning. The system was used for calculating the observatiion characteristics of Halley's comet during its approach to Earth in 1985-86.
    Keywords: ASTRONOMY
    Type: NAS 1.15:77632 , NASA-TM-77632
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    NASA astrophysics - Optical systems to explore the universe (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Major and minor NASA astrophysical research efforts in the near-term are outlined, together with projections of direction for future projects. The Space Telescope is being readied for a 1986 launch and will feature an f/24, 2.4 m aperture, an MgF2 mirror with better than 1/60 wavelength accuracy and will be diffraction-limited in the UV. Pointing accuracy is designed to be 0.007 arcsec for 24 hr. Optical, spectrometric, and photometric equipment will be included. Around 1990, Shuttle-based missions will include an IR telescope and a subarcsec solar surface imaging device. A free-flying X-ray observatory (AXAF) is planned and will include a sensitivity that exceeds that of the HEAO-2 spacecraft by two orders of magnitude. Instruments are under development for higher resolution UV, gamma-ray, and IR studies. In-orbit interferometry is being studied and will depend on in-orbit assembly and servicing of stable structures with segmented optics.
    Keywords: ASTRONOMY
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    IRAS observations of the diffuse infrared background (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: IRAS data reveal bright emission from interplanetary dust which dominates the celestial background at 12, 25, and 60 microns except near the galactic plane. At 100 microns, interplanetary dust emission is prominent only near the ecliptic plane; diffuse galactic emission is found over the rest of the sky. At the galactic poles, the observed brightness implies that A(v) is likely to be of order 0.1 mag. The angular variation of the zodiacal emission in the ecliptic plane and in the plane at elongation 90 deg, and an annual modulation of the ecliptic pole brightness, are generally consistent with previously determined interplanetary dust distributions.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L15-L18
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The IRAS minisurvey (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Before the main Infrared Astronomical Satellite (IRAS) all-sky survey was started, a preliminary survey of 900 sq deg was carried out. Some results from this 'minisurvey' are given here. The completeness of the minisurvey at galactic latitudes from 20 to 40 deg drops sharply at flux densities below 0.4, 0.4, 0.5, and 2.5 Jy at 12, 25, 60, and 100 microns, respectively. The corresponding surface densities of point sources brighter than these flux levels are 1.1, 0.4, 0.65, and 1.25/sq deg, respectively. Outside the galactic plane, the majority of the sources at 12 and 25 microns are stars, while galaxies make up a significant proportion of 60 micron sources. The 100 micron band is dominated by emission from interstellar dust over much of the minisurvey area.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L7-L10
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    IRAS images of the galactic center (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Some preliminary IRAS results in the form of images at 12, 25, 60, and 100 microns of an 8 deg x 15 deg area around the galactic center are presented. These absolute intensity maps have unprecedented sensitivity combined with high angular resolution, wide field coverage, and large wavelength range. They give a broad view of the central galaxy revealing previously unseen details, especially in regions far from the central few arcmin. Well-defined infrared features in the nucleus correspond to the nuclear radio sources Sgr A, B2, C, and D. Extremely faint structures are detected, such as the cold molecular cloud associated with Sgr B2 which has never before been detected at wavelenths shorter than 40 microns.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L57
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Abundances in galactic H2 regions, 3: G25.4-0.2, G45.5+0.06, M8, S159 and DR22 (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Measurements of the ARII (6.99 microns), ArIII (8.99 microns), NeII (12.81 microns), SIII (18.71 microns), and SIV (10.51 microns) lines are presented for five compact HII regions along with continuum spectroscopy. From these data and radio data, lower limits to the elemental abundances of Ar, S, and Ne were deduced. The complex G25.4-0.2 is only 5.5 kpc from the galactic center, and is considerably overabundant in all these elements. Complex G45.5+0.06 is at seven kpc from the galactic center, and appears to be approximately consistent with solar abundance. The complex S159 in the Perseus Arm, at 12 kpc from the galactic center, has solar abundance, while M8 in the solar neighborhood may be somewhat overabundant in Ar and Ne. Complex DR 22, at 10 kpc from the galactic center in the Cygnus Arm, is overabundant in Ar. A summary of results from a series of papers on abundances is given.
    Keywords: ASTRONOMY
    Type: NASA-TM-85962 , A-9756 , NAS 1.15:85962 , PREPRINT-017
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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