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  • ASTROPHYSICS  (1,298)
  • 2020-2024
  • 2010-2014
  • 1985-1989  (822)
  • 1975-1979  (476)
  • 1955-1959
  • 1940-1944
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  • 1
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    Redshifts of low-X-ray luminosity clusters of galaxies (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Measurements of redshifts and velocity dispersions are presented for Abell clusters A539, A1185, and A1228, and the southern clusters S1840-623, S1904-618, S1908-566, and S2000-561. All these clusters have reported X-ray luminosities or upper limits. Finding charts for the clusters are presented, and the measured heliocentric redshifts are given along with redshifts obtained by other investigators. Comments are made about each cluster. The technique used to derive the redshifts is summarized.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 93; 1350-135
    Format: text
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  • 2
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    A multi-wavelength study of the long-period AM Her system E2003+225. I - The soft X-ray light curve and overall energy spectrum (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: X-ray, UV and optical data are presented of the longest period AM Her object, E2003+225, from October 12, 1983, together with a new linear polarization ephemeris. The optical and X-ray data were obtained simultaneously and the UV observations were carried out on the same day. A 6-hr observation with the Exosat 500 line/mm objective grating restricts soft X-ray blackbody temperatures to the range 18-29 eV. The blackbody luminosity exceeds the hard X-ray luminosity by at least a factor of 4.5, but is of the same order as the optical/UV component. Soft (0.1-0.25 keV) and hard X-ray (1-6 keV) light curves covering almost two orbital periods are presented and discussed.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 221; 823-838
    Format: text
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  • 3
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    A second supernova inside Puppis A? (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Narrow-band images of an unusual swirl structure located near the center of the Puppis A supernova remnant are presented which reveal three overlapping filamentary systems of highly diverse composition. One is dominated by emission lines of nitrogen, one by oxygen, and one by sulfur. Spectra indicate that these small rings have high velocities and a corresponding kinematic age of less than 800 yr. Heavy-element abundances are extremely high and different in each system, some reminiscent of knots in Cas A, and others of circumstellar matter observed surrounding supernova 1987A. The youth and unusual chemistry lead to the suggestion that a second supernova has exploded within the shell of Puppis A, giving rise to the swirl structure.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 337; 48-50
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  • 4
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    WHT observations of cataclysmic variables in globular clusters. I - V101 in M5 during quiescence and outburst (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: WHT spectroscopy and photometry are used to investigate the structure of the cataclysmic vaiable V101, in the globular cluster M5. An encouraging consistency is found between the properties derived from the color, magnitude, radial-velocity variations and outburst light curve. All these indicate that V101's orbital period lies above the period gap, is at the distance of M5, and is probably a dwarf nova.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 241; 25P-30P
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  • 5
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    The constancy of the ratio of the molecular hydrogen lines at 3.8 microns in Orion (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The 1-0 O(7) and 0-0 S(13) lines of H2, at 3.807 and 3.846 microns, have been mapped over the region of the Orion molecular outflow. The intensity ratio of these lines is found to be independent of position in the outflow. From this it is inferred that the structure of the shocks and their cooling flows in Orion may be more akin to hydrodynamic shocks than the low-temperature C-shocks that are currently favored.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 236; 929-934
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  • 6
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    The analysis of various size, visually selected and density and magnetically separated fractions of Luna 16 and 20 samples (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Samples of Luna 16 and 20 have been separated according to size, visual appearance, density, and magnetic susceptibility. Selected aliquots were examined in eight British laboratories. The studies included mineralogy and petrology, selenochronology, magnetic characteristics, Mossbauer spectroscopy, oxygen isotope ratio determinations, cosmic ray track and thermoluminescence investigations, and carbon chemistry measurements. Luna 16 and 20 are typically mare and highland soils, comparing well with their Apollo counterparts, Apollo 11 and 16, respectively. Both soils are very mature (high free iron, carbide, and methane and cosmogenic Ar), while Luna 16, but not Luna 20, is characterized by a high content of glassy materials. An aliquot of anorthosite fragments, handpicked from Luna 20, had a gas retention age of about 4.3 plus or minus 0.1 Gy.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington the Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, Pt. 2; p 703-727
    Format: application/pdf
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  • 7
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    Evidence for a supermassive object in the nucleus of the galaxy M87 from SIT and CCD area photometry (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are presented for broadband three-color (BVR) photometric observations of the peculiar elliptical radio galaxy M87, which were obtained with digital two-dimensional SIT and CCD detector systems on the Palomar 60-in. and 200-in. telescopes. The observations and the reduction procedures for the digital data are outlined, the luminosity profile of M87 is given, and a nuclear luminosity spike is found to be centered within 0.02 arcsec of the center of M87. Attempts are made to fit various theoretical models to the luminosity profile, and a satisfactory fit is obtained between the observed profile and a model involving a massive black hole in the galactic nucleus. A model-independent dynamical analysis of the central regions is performed which indicates that the nucleus of M87 contains a supermassive object of about 5 billion solar masses with a radius of no more than 100 pc and an M/L ratio of at least 60. The possible nature of this object is considered, and it is concluded that M87 is probably the most plausible candidate for a massive black hole in a galactic nucleus.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 221
    Format: text
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  • 8
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    The penultimate supernova in the Large Magellanic Cloud - SNR 0540-69.3 (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Spectra of the SNR 0540-69.3 in the LMC are presented that cover the wavelength interval 3500-9800 A. An optical continuum is observed over this entire wavelength range from synchrotron emission near the 50 ms pulsar inside the remnant. The spectrum contains emission lines shifted by + 370 km/s from the local LMC rest velocity. The line widths average 2735 + or - 200 km/s, indicating an expansion age of 762 + or - 50 yr. Lines of forbidden O I, forbidden O II, forbidden O III, forbidden S II, forbidden S III, forbidden Ar III, forbidden Ni II, forbidden Fe II, forbidden Fe III, and H-alpha are detected, and forbidden Fe V and forbidden Fe VII may be detected. It is very likely that the object is the young SNR following core collapse of a massive star akin to the progenitor of SN 1987A.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 342; 260-271
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  • 9
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    The heating of the solar wind by the interstellar neutral gas (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Solar wind heating by ionization and assimilation of the interstellar neutral wind is investigated using a numerical model of the interaction. The model is a time-dependent, one-dimensional, spherically symmetric, one-fluid code which includes mass, momentum, and energy sources due to the efficient incorporation of ionized interstellar hydrogen. Solar wind data at 1 AU from October 12, 1978 to February 25, 1980 were input to the inner boundary of the model and propagated out to 10 AU. Then, 52-day averages of proton temperature as functions of radius were produced for three values of the interstellar hydrogen density: 0.0, 0.03, and 0.1 per cu cm. It is concluded that, within the context of the model, the observations of solar wind proton temperatures at Voyager 1 and Pioneer 11 are consistent with heating of the solar wind by an interaction with inflowing interstellar neutral hydrogen. The density of this inflowing gas is near 0.03/cu cm.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 12
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  • 10
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    Extinction and abundance properties of Alpha Scorpii circumstellar grains (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The UV extinction and element depletions in the circumstellar envelope Alpha Sco are investigated using IUE, Copernicus, and AS data of Alpha Sco B which can be seen in absorption through the cool-star envelope. The circumstellar reddening, depletions, and spectral extinction toward Alpha Sco B are estimated. Evidence is presented which suggests that the circumstellar grains are large and siliceous.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 321; 921-936
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