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  • Other Sources  (6)
  • 1975-1979  (6)
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Year
  • 1
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    The interacting binary SCO X-1 (1976)
    In:  CASI
    Details
    Publication Date: 2006-04-18
    Description: Spectroscopic observations of Sco X-1 show conclusively that the emission lines vary in radial velocity with a period of .787 sup d + or - .006 and a full range of approximately 120 km/s. The period is identical to that found by Gottleib et al (1975) from photometric data; light minimum occurs when the emission line region is at superior conjunction. The observations indicate that the emission lines originate in an accretion disk surrounding a neutron star which is orbiting about a normal, although somewhat evolved companion. The light variation is due to a heating effect on the non degenerate star, viewed at a small inclination angle.
    Keywords: ASTROPHYSICS
    Type: NASA. Goddard Space Flight Center X-ray Binaries; p 683-690
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Uranium lines in the spectra of peculiar A stars - A search for recent r-process events (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Uranium wavelengths in the spectra of Ap stars are studied to see if they give any indication of a recent r-process event. It is concluded that there is no credible evidence for an admixture of uranium-235 in these stars, which would imply such an event. The evidence, though negative, is badly confused by blending of lines, and a final judgement must wait for an observational clarification of the situation.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Letters; 16; 1, 19; 1975
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    NASA TECHNICAL REPORTS
  • 3
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    Centaurus X-3 (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Spectroscopic observations of Krzeminski's star at dispersions 25-60 A/mm are described. The primary is an evolved star of type O6-O8(f) with peculiarities, some of which are attributable to X-ray heating. Broad emission lines at 4640A (N III), 4686 A(He II) and H-alpha show self-absorption and do not originate entirely from the region near the X-ray star. The primary is not highly luminous (bolometric magnitude about -9) and does not show signs of an abnormally strong stellar wind. The X-ray source was 'on' at the time of optical observations. Orbital parameters are presented for the primary, which yield masses of 17 + or - 2 and 1.0 + or - 3 solar masses for the stars. The optical star is undermassive for its luminosity, as are other OB-star X-ray primaries. The rotation is probably synchronized with the orbital motion. The distance to Cen X-3 is estimated to be 10 + or - 1 kpc. Basic data for 12 early-type X-ray primaries are discussed briefly
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 229
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    NASA TECHNICAL REPORTS
  • 4
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    The peculiar object HD 44179 /'The red rectangle'/ (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A strong infrared source detected in the AFCRL sky survey is confirmed, and is identified with the binary star HD 44179, embedded in a peculiar nebula. UBVRI and broad-band photometry between 2.2 and 27 microns are combined with blue, red, and near-infrared spectra, polarimetry and spectrophotometry of the star, and a range of direct and image-tube photographs of the nebula, to suggest a composite model of the system. In this model, the infrared radiation derives from thermal emission by dust grains contained in a disklike geometry about the central object, which appears to be of spectral type B9-A0 III and which may be in pre-main-sequence evolution. Two infrared emission features are found, peaking at 8.7 and 11.3 microns, the latter corresponding to the feature seen in the spectrum of the planetary nebula NGC 7027. The complex nebular structure is discussed on the basis of photographs through narrow-band continuum and emission-line filters. The polarization data support the suggestion of a disk containing some large particles. No radio continuum emission is detected.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 196; Feb. 15
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  • 5
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    Orbit selection for the 1978 Pioneer Venus mission (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Pioneer Venus Orbiter will be launched by NASA in the spring of 1978. Selection of the orbit in July, 1975, resulted from scientific, mission, spacecraft, and operational considerations summarized by this paper. The orbit will be inclined 105 deg to the ecliptic, and its periapsis will lie between 16 and 28 deg north celestial latitude. Its periapsis altitude will be maintained between 150 and 260 km above the solid surface, and its period will be kept near 24 hr. This orbit and the spinning spacecraft's ecliptic-normal attitude permit the scientific coverage geometry of Venus, which also is summarized here.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 76-798 , Astrodynamics Conference; Aug 18, 1976 - Aug 20, 1976; San Diego, CA
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    NASA TECHNICAL REPORTS
  • 6
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    Development and flight experience of the Voyager propulsion system (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The primary Voyager Project objective is to extend the exploration of the solar system to the neighborhood of Jupiter and Saturn with a spacecraft that can conduct scientific experiments at both planetary systems and pave the way for later missions to the outer planets. The development and in-flight performance of the Voyager propulsion system are described. Emphasis is placed on the unique features of this system and on the solution to several problems encountered in its development. Over the past 20-month flight, the propulsion systems on Voyager I and Voyager II have exhibited excellent performance without failures.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 79-1334 , AIAA, SAE, and ASME, Joint Propulsion Conference; Jun 18, 1979 - Jun 20, 1979; Las Vegas, NV
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