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  • Other Sources  (21)
  • NASA Technical Reports  (21)
  • ASTRONOMY  (14)
  • ATOMIC AND MOLECULAR PHYSICS  (7)
  • Aerospace Medicine
  • Astrophysics
  • Geophysics
  • 1980-1984  (21)
  • 1
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    Infrared observations of RS CVn stars (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The paper presents infrared photometry of the RS CVn binary stars AR Lac (1.2-10 microns) and MM Her (1.2-3.5 microns) as they egressed from their primary and secondary eclipses; of the eclipsing systems RS CVn and Z Her at maximum light (1.2-10 microns) and of the non-eclipsing systems UX Ari and HR 1099 (1.2-10 microns). An analysis of these and published V data based on flux ratio diagrams (linear analogues of color-color diagrams) shows that G and K stars supply the infrared light of these systems. In AR Lac, the combined light of a G5-K0 subgiant and either a late F dwarf or an early F subgiant can account for the observed visual and infrared light curves. None of these systems shows infrared emission from circumstellar matter. This result is simply understood: dust grains would not be expected to form in the physical conditions surrounding the subgiant, and the corona and chromosphere (whose properties have been deduced from spectroscopic X-ray observations) should not produce appreciable infrared emission.
    Keywords: ASTRONOMY
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 205; 859-873
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  • 2
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    Very large array observations of Jupiter's nonthermal radiation (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The VLA has been used at 18 and 20 cm to obtain observational data on Jupiter at all rotational aspects in all four Stokes parameters, yielding maps of the total, linearly polarized and circularly polarized intensity with a resolution of 0.25 Jupiter radii. These maps reveal such previously undetected phenomena as an emission feature close to the planetary surface north and south of each of the two main radiation peaks. The emission from 1.8 to about 3 Jupiter radii from the planet's center is sharply confined to the magnetic equator.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal Supplement Series (ISSN 0067-0049); 54; 405-419
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  • 3
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    Observations of comet IRAS-Araki-Alcock 1983d (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Observations of comet IRAS-Araki-Alcock 1983d in the infrared region from 12 to 100 microns are reported. The dominant feature seen in the infrared is an extensive dust tail not reported in visual observations. A dust production rate of 200 kg/s is deduced. The far-infrared spectrum suggests that the radius of a mean grain decreases from 30 to 5 microns along the tail.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L11-L14
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  • 4
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    The infrared properties of galaxy clusters - IRAS observations of the Hercules Cluster (Abell 2151) (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A total of 41 sources have been detected at 60 microns to a level of 50 mJy in a 1.6 x 0.5 deg field centered on the rich galaxy cluster Abell 2151. Twenty-four of these sources can be identified with late-type spiral galaxies of estimated photographic magnitude 17 or brighter. Galaxies classified as E or S0 are notably absent in the infrared data. Within the field, eleven of the IRAS sources cannot be easily identified with galaxies in the Hercules Cluster. If the brightest 60 micron cluster source (NGC 6045) is neglected, the integral luminosity function in the far-infrared can be fitted well with two power laws of slope -1.1 and -2.5.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L75-L78
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  • 5
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    Measurement of the J = 0-1 rotational transitions of three isotopes of ArD(+) (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The rotational transitions of all three isotopic species of ArD(+) in samples containing the Ar isotopes in their natural abundances have been measured by means of millimeter and submillimeter techniques that employ a magnetically enhanced abnormal glow discharge. All three transition frequency measurements were made from digitally averaged signals detected through a lock-in amplifier with a 10-msec time constant. The Ar-4OD(+) transition was easily visible in real time on an oscilloscope with SNR of about 15. It is noted that the observed transition of Ar-38D(+) is more than five orders of magnitude weaker than that due to HCO(+).
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics (ISSN 0021-9606); 79; Aug. 15
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  • 6
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    The oxygen I depletion in the diffuse interstellar medium (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 244
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  • 7
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    The far-ultraviolet energy distribution of two globular cluster blue horizontal-branch stars in M13 (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The far-UV energy distribution of two blue horizontal-branch (BHB) stars detected in the nucleus of M13 is presented. Their continua can be characterized by a model atmosphere of an effective temperature of 15,000 to 20,000 K and log g = 4.5, and it follows that V is in the range 15.9-16.7 for these stars. Comparison with integrated photometry by OAO 2 and by ANS indicates that, at wavelengths smaller than 1800 A, the integrated light is from BHB stars only, of which M13 contains about 200. For these far-UV wavelengths, the color of the BHB stars is also very similar to the integrated color of the elliptical galaxy M87.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 243
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  • 8
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    High-accuracy linear and circular polarization measurements at 21 cm (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: New high-accuracy linear and circular polarization measurements have been obtained for 27 small-diameter radio sources, using the Westerbork Synthesis Radio Telescope at 21 cm (1415 MHz). From these and other observed properties of the sources, estimates of the average internal magnetic field strengths in the sources are made by applying the uniform synchrotron emission model to the measured circular polarization and by using equipartition arguments. These two values are compared and found to be in agreement to within an order of magnitude, as was previously found by Weiler and de Pater (1980). Also, the magnetic fields estimated from circular polarization measurements at two different wavelengths (49 and 21 cm) are compared and found to be in rough agreement, but with indications of differences between variable and nonvariable sources. A comparison of the magnitudes of linear and circular polarization in sources shows no correlations.
    Keywords: ASTRONOMY
    Type: Royal Astronomical Society; vol. 198
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  • 9
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    Millimeter and submillimeter spectra of HCO/+/ and DCO/+/ (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The J = 0-1 transitions of six different isotopic forms of the HCO(+) molecular ion, which were investigated by Woods et al. (1975), are considered. The extension of this work into the shorter millimeter and submillimeter region is reported here, as is the measurement of these spectra through J = 4-5 for HCO(+) and J = 5-6 for DCO(+). It is noted that these measurements can be used to determine accurate rotational constants and rest frequencies for these astrophysically important species. Tables listing the observed rotational constants and spectral constants of HCO(+) and DCO(+) are included.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 75; Oct. 15
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  • 10
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    Prediction and assignment of the FIR spectrum of hydrogen peroxide (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Millimeter and submillimeter microwave studies are used to predict and assign the FIR rotational-torsional spectrum of hydrogen peroxide. Special attention is given to the strong Q-branch features that have recently been used by Traub and Chance to place an upper limit on the atmospheric abundance of hydrogen peroxide. In addition, 67 new transitions are reported in the 400-1000 GHz region.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 32; 325-333
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