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  • SPACE SCIENCES  (16)
  • Astrophysics  (1)
  • 1
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    Ultraviolet photometry from the orbiting astronomical observatory. III - Observations of Venus, Mars, Jupiter, and Saturn longward of 2000 A. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A number of high-quality spectra of Mars, Jupiter, the combined disk and rings of Saturn, as well as lower-quality spectra of Venus, have been obtained with an objective-grating spectrometer of the Wisconsin Experiment Package of OAO-2. An intercomparison of the Mars, Jupiter, and Saturn spectra has failed to disclose any discrete planetary absorptions. Continuous albedos have been derived for the four planets by using OAO-2 observations of G-type stars for wavelengths greater than 2700 A. The geometric albedo of Mars shows a steady increase below 3500 A which appears to be due to Rayleigh scattering combined with a decreasing surface reflectivity. The albedos of Venus, Jupiter, and Saturn show a maximum in reflectivity in the region of 2500 A.-
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 172; Mar. 15
    Format: text
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  • 2
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    A survey of local interstellar hydrogen from OAO-2 observations of Lyman alpha absorption (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Wisconsin far ultraviolet spectrometer aboard OAO-2 observed the wavelength region near 1216 A for 69 stars of spectral type B2 or earlier. From the strength of the observed interstellar L sub alpha absorption, atomic hydrogen column densities were derived over distances averaging 300 pc away from the sun. The OAO data were compared to synthetic ultraviolet spectra, originally derived from earlier higher resolution rocket observations, which were computer processed to simulate the effects of absorption by different amounts of hydrogen followed by the instrumental blending.
    Keywords: SPACE SCIENCES
    Type: NASA, Washington The Sci. Results from the Orbiting Astron. Obs. (OAO-2) e; p 237-281
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  • 3
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    Interstellar extinction in the ultraviolet (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Interstellar extinction curves over the region 3600-1100 A for 17 stars are presented. The observations were made by the two Wisconsin spectrometers onboard the OAO-2 with spectral resolutions of 10 A and 20 A. The extinction curves generally show a pronounced maximum at 2175 plus or minus 25 A, a broad minimum in the region 1800-1350 A, and finally a rapid rise to the far ultraviolet. Large extinction variations from star to star are found, especially in the far ultraviolet; however, with only two possible exceptions in this sample, the wavelength at the maximum of the extinction bump is essentially constant. These data are combined with visual and infrared observations to display the extinction behavior over a range in wavelength of about a factor of 20.
    Keywords: SPACE SCIENCES
    Type: NASA, Washington The Sci. Results from the Orbiting Astron. Obs. (OAO-2) e; p 175-198
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  • 4
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    Observations of Venus, Mars, Jupiter and Saturn longward of 2000 A (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A number of high quality spectra of Mars, Jupiter, the combined disk and rings of Saturn, as well as lower quality spectra of Venus, have been obtained with an objective grating spectrometer of the Wisconsin experiment package on OAO-2. An intercomparison of the Mars, Jupiter and Saturn spectra has failed to disclose any discrete planetary absorptions. Continuous albedos have been derived for the four planets by using OAO-2 observations of G-type stars for wavelengths greater than 2700 A and a new photoelectric solar spectrum for wavelengths smaller than 2700 A. The geometric albedo of Mars shows a steady increase below 3500 A which appears to be due to Rayleigh scattering combined with a decreasing surface reflectivity. The albedos of Venus, Jupiter and Saturn show a maximum in reflectivity in the region of 2500 A.
    Keywords: SPACE SCIENCES
    Type: NASA, Washington The Sci. Results from the Orbiting Astron. Obs. (OAO-2); p 115-138
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  • 5
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    A survey of local interstellar hydrogen from OAO-2 observations of Lyman alpha absorption. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A far UV spectrometer aboard OAO-2 observed the wavelength region near 1216 A for 69 stars of spectral type B2 or earlier. From the strength of the observed interstellar L-alpha absorption, column densities of atomic hydrogen were derived over distances averaging 300 pc away from the sun. Measurements of the equivalent widths of this absorption were found to be inappropriate for deducing column densities because of the blending of nearby strong stellar lines by the 12 A wide instrumental profile of the OAO. Instead, the OAO data were compared with synthetic UV spectra, originally derived from earlier higher-resolution rocket observations, which were computer processed to simulate the effects of absorption by different amounts of hydrogen followed by the instrumental blending.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 172; Mar. 1
    Format: text
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  • 6
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    Ultraviolet photometry from the Orbiting Astronomical Observatory. II Interstellar extinction. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Evaluation of interstellar extinction curves over the region from 3600 to 1100 A for 17 stars. The observations were made by the two Wisconsin spectrometers on board the Orbiting Astronomical Observatory 2, with spectral resolutions of 10 and 20 A. The extinction curves generally show a pronounced maximum at 2175 plus or minus 25 A, a broad minimum in the region from 1800 to 1350 A, and finally a rapid rise to the far-ultraviolet. Large extinction variations from star to star are found, especially in the far-ultraviolet; however, with only two possible exceptions in this sample, the wavelength at the maximum of the extinction bump is essentially constant. These data are combined with visual and infrared observations to display the extinction behavior over a range in wavelength of about a factor of 20. The observations appear to require a multicomponent model of the interstellar dust.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 171; Jan. 15
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  • 7
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    Radiative lifetimes of ultraviolet multiplets in Si, P, S, O, Ne II, and Ar II. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Radiative lifetimes of UV multiplets in Si, P, S, O, Ne 2 and Ar 2 measured via phase shift method, correcting for transition cascading
    Keywords: SPACE SCIENCES
    Type: ASTROPHYSICAL JOURNAL
    Format: text
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  • 8
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    Oscillatory modes of energy transport in solar magnetic regions. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Sunspot energy transport from oscillatory instabilities indicated from calculations on hydromagnetic stability of thermally unstable layers with open boundary conditions
    Keywords: SPACE SCIENCES
    Type: SYMPOSIUM ON STRUCTURE AND DEVELOPMENT OF SOLAR ACTIVE REGIONS; Sep 04, 1967 - Sep 08, 1967; BUDAPEST; HUNGARY
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  • 9
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    An upper limit to the angular diameter of the nucleus of NGC 4151. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Half intensity angular diameter upper limit of Seyfert galaxy NGC 4151 nucleus, considering nonthermal continuum
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
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  • 10
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    Ultraviolet photometry from the orbiting astronomical observatory. XVI - The stellar Lyman-alpha absorption line (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The stellar Lyman-alpha line at 1216 A was observed in 29 lightly reddened stars of spectral type B2.5 to B9 by a far-UV spectrophotometer on OAO-2. The equivalent widths obtained range from 15 A at type B2.5 to 65 A at type B8; in the late-B stars, the L-alpha line removes 2 to 3% of the total stellar flux. In this sampling, the strength of the L-alpha line correlates well with measures of the Balmer discontinuity and Balmer line strengths; luminosity classification does not seem to affect the line strength. The observed line widths also agree with the predictions of Mihala's grid of non-LTE model atmospheres. In some cases, the L-alpha line influences the interstellar column densities reported in the interstellar OAO-2 L-alpha survey. Hence, these data toward lightly reddened B2 and B1.5 stars should be regarded as upper limits only.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 191; Aug. 1
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