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  • Other Sources  (112)
  • ASTROPHYSICS  (112)
  • Analytical Chemistry and Spectroscopy
  • Humans
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  • 1985-1989  (112)
  • 1965-1969
  • 1988  (112)
  • 1
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    Meridional plasma flow in the outer heliosphere (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Voyager 2 observations made in the outer heliosphere near 25 AU and within 2 deg of the heliographic equatorial plane show periodic variations in the meridional (North/South) flow velocities that are much more prominent than the East/West variations. An autocorrelation analysis shows that the flow variation has a period of about 25.5 days in the latter half of 1986, in approximate agreement with the solar rotation period. The results suggest that increased pressure in interaction regions remains the best candidate for the driver of the nonradial flows.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 15; 1519-152
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  • 2
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    On the nearest molecular clouds. II - MBM 12 and 16 (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The paper presents echelle spectra recorded at the D lines of Na I for three stars projected on the high-latitude molecular cloud MBM 16 at l = 172 deg, b = -38 deg. The A stars HD 21142 at about 95 pc and HD 21134 at about 240 pc show strong D-line absorption at the same velocities as the CO emission observed at these positions. The distance to MBM 16 therefore is in the range of 60 to 95 pc. MBM 16 is only 11 deg away from MBM 12, previously placed by the same method at distance of about 65 pc. Consideration is given to the relationship between clouds 12 and 16 and the local hot low-density interstellar gas.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 327; 356-363
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  • 3
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    Formation of particulates by ion bombardment of cryogenic ice mixtures (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An analysis of the particulates which form upon the bombardment of a gaseous mixture reflecting cosmic molecular abundances with H2(+) ions accelerated at 350 keV. The model of Black and Dalgarno (1977) for the Zeta Oph cloud and an observational determination of the interstellar Ar abundances (Simpson et al., 1986) are used to determine the abundances of the gas mixture. The characteristics of the resulting residue are examined, including photographs and absorbance spectra. The possible astrophysical implications of the experiment are discussed.
    Keywords: ASTROPHYSICS
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  • 4
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    Powerful warm infrared sources in early-type galaxies (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: IRAS far-infrared sources have been identified with 129 S0, Sa, Sb, and Sc galaxies in a statistically complete sample of 738 galaxies brighter than 14.5 mag and smaller than 4.0 arcmin. In most cases, the far-IR colors and the ratios of far-IR flux to radio flux density are those of normal galactic disks and/or starbursts. The most powerful far-IR sources in S0 and Sa galaxies are just as powerful as the strongest far-IR sources in Sb and Sc galaxies. Bright-IR sources in S0 and Sa galaxies are warm; those in Sc galaxies are cool. Sb galaxies have both warm and cool IR sources. Bright warm IR sources occur much more frequently in barred galaxies than in galaxies without bars for types S0, Sa, and Sb. Bright, cool IR sources are found with increasing frequency along the Hubble sequence, regardless of the presence or absence of a bar. At least some 'S0' galaxies with warm, bright IR sources have peculiar morphologies and ambiguous classifications.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 329; L69-L73
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  • 5
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    Newly detected molecules in dense interstellar clouds (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The last year or so has seen the identification of several new interstellar molecules, including C2S, C3S, C5H, C6H, and (probably) HC2CHO in the cold, dark cloud TMC-1, and the discovery of the first interstellar phosphorus-containing molecule, PN, in the Orion 'plateau' source. Further interesting results include the observations of (C-13))3H2 and C3HD, and the first detection of HCOOH (formic acid) in a (C-13)3H2 cold cloud.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Letters and Communications (ISSN 0888-6512); 26; 3-5
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  • 6
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    Expectations for the microphysics of the Mars-solar wind interaction (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The two Phobos spacecraft, which will start to orbit Mars early in 1989, will be capable of investigating in detail the microphysics of the Mars-solar wind interaction. Simple scaling arguments and analogies with other planetary bow shocks indicate that the sub-solar shock standoff distance should be small compared with plasma scalelengths, giving the shocked solar wind insufficient space in which to thermalize downstream before encountering the magnetospheric obstacle. Both the magnetosphere and ionosphere can be affected by particles and waves from the solar wind interaction.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 15; 429-432
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  • 7
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    Simultaneous X-ray and radio observations of GX 13 + 1 (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The results of simultaneous X-ray and radio observations of GX 13 + 1, intrinsically one of the brightest Galactic bulge X-ray sources, are presented and possible models are discussed. No evidence is found for correlated X-ray and radio flux density variations. The variation of the 6-20 cm wavelength spectral index from +0.5 to -1.0 indicates that the radio flux is probably produced by a nonthermal emission mechanism. Application of an equipartition synchrotron model to the data suggests that the radio emission originates in a region with a magnetic field of about 1 gauss. If the radio flux density variations are due to injection of relativistic electrons, the equivalent nonthermal particle energy is 10 to the 36th - 10 to the 41st ergs/s.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 328; 552-555
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  • 8
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    HCO emission from H II-molecular cloud interface regions (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A survey of well-known molecular clouds in the four strongest HCO N(k-,k+) = 1(01)-O(60) hyperfine transitions has been carried out to determine the prevalence of HCO and to study its chemistry. HCO emission was observed in seven molecular clouds. Three of these, NGC 2264, W49, and NGC 7538, were not previously known sources of HCO. In addition, NGC 2024 and Sgr B2 were mapped and shown to have extensive HCO emission. The survey results show the HCO abundance to be enhanced in H II-molecular cloud interface regions and support a correlation between C(+) and HCO emission. The strength of the HCO emission in NGC 2024 is interpreted in terms of this enhancement and the source structure and proximity to Earth.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 328; 785-796
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  • 9
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    The relationship between the Eddington limit, the observed upper luminosity limit for massive stars, and the luminous blue variables (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The observed upper luminosity limits in the Galaxy and the LMC are compared with the Eddington limit as estimated for plane-parallel LTE model atmospheres which include the full effects of metal line opacities in the ultraviolet. It is shown that the Humphreys-Davidson (HD) limit corresponds to the locus of extremely low effective gravities. This result suggests that stars approaching the HD limit will suffer high mass-loss rates because of the reduction of the effective gravity due to radiation pressure. These high mass-loss rates ultimtely lead to the core mass fraction reaching its critical value and the reversal of the stellar evolution tracks. It is shown that radiation pressure, as an agent for producing enhanced mass loss near the HD limit, can in a natural way explain the kink in the HD limit near T(eff) roughly 10,000 K and the upper luminosity limit for yellow and red supergiants. The high mass-loss rates of the luminous blue variables, their location in the HR diagram, and their evolutionary stage are also discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 324; 279-287
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  • 10
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    VLBI angular broadening measurements in the Cygnus region (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Multiple-frequency VLBI observations of eight compact radio sources with lines of sight which cross the Galactic plane in Cyg are reported. The data are presented in a table and map and analyzed, with a focus on angular broadening (AB) induced by interstellar scattering. AB is confirmed in four of the sources, whereas the structures of the other four appear to be intrinsic. The AB is found to be limited to a region within a few deg of the Galactic plane.
    Keywords: ASTROPHYSICS
    Type: AIP Conference on Radio Wave Scattering in the Interstellar Medium; Jan 18, 1988 - Jan 19, 1988; San Diego, CA; United States
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