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  • 1975-1979  (3)
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  • 1975-1979  (3)
Year
  • 1
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1979
    In:  Publications of the Astronomical Society of Australia Vol. 3, No. 6 ( 1979), p. 400-402
    In: Publications of the Astronomical Society of Australia, Cambridge University Press (CUP), Vol. 3, No. 6 ( 1979), p. 400-402
    Abstract: Radio position measurements with an error of 〈 2” arc rms allow reliable optical identifications of compact radio sources to be made solely on the basis of radio-optical position coincidence. In this way neutral or red stellar objects, faint compact galaxies and faint QSOs can be reliably identified. Such identifications are of particular interest because they are rich in BL Lac objects, high-redshift QSOs, QSOs with unusual optical emission or absorption spectra and galaxies with active nuclei (see Jauncey et al . 1978).
    Type of Medium: Online Resource
    ISSN: 1323-3580 , 1448-6083
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1979
    detail.hit.zdb_id: 2560489-2
    detail.hit.zdb_id: 2079225-6
    SSG: 16,12
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1979
    In:  Publications of the Astronomical Society of Australia Vol. 3, No. 5 ( 1979), p. 353-354
    In: Publications of the Astronomical Society of Australia, Cambridge University Press (CUP), Vol. 3, No. 5 ( 1979), p. 353-354
    Abstract: The primary function of the 64-m telescope, situated at Tidbinbilla near Canberra, is to communicate with and to control NASA’s unmanned interplanetary space craft (Reid et al . 1973). Similar telescopes are situated at Goldstone in California and in Madrid and are part of the NASA-JPL Deep Space Network (DSN). Under the Host Country Radio Science Agreement between the U.S. and Australia the telescope is available to Australian astronomers at times outside those committed to normal tracking. A radiometer operating at λ = 13.5 mm has been built by CSIRO for use on the 64-m telescope. It was initially used for VLBI observations of water vapour masers on baselines between the U.S., Australia and USSR (Batchelor et al . 1976).
    Type of Medium: Online Resource
    ISSN: 1323-3580 , 1448-6083
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1979
    detail.hit.zdb_id: 2560489-2
    detail.hit.zdb_id: 2079225-6
    SSG: 16,12
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    CSIRO Publishing ; 1979
    In:  Australian Journal of Physics Vol. 32, No. 2 ( 1979), p. 43-
    In: Australian Journal of Physics, CSIRO Publishing, Vol. 32, No. 2 ( 1979), p. 43-
    Abstract: X-ray, radio and optical observations have been used to derive a binary star model for CircinusX-1. Mass transfer between the primary star (Mp ~ 20Mo) and the compact companion star (Me ~ Mo) triggers one or more expanding shock fronts in the vicinity of the compact star. These shocks produce the observed radio emission. Variable optical emission arises both from the changing Roche lobe surface in the highly eccentric system (e ~ 0�8) and from degradation of shock-produced X-ray photons to the optical band by material overlying the expanding shock. The X-ray radiation results from matter in the accretion disc dribbling down on to the surface of the compact star. Mass replenishment at a rate of 5 x 10-8 to 5 X 10-10 Mo per orbit (16�6 day period) occurs near periastron passage. The variation of the X-ray emission arises from absorption in the stellar wind of the primary star. The model predicts an apsidal rotation period for the elliptical orbit of 7-400 yr, an orbital circularization time of ~ 500 yr and a period change of about 0�5 day per 10 yr.
    Type of Medium: Online Resource
    ISSN: 0004-9506
    Language: English
    Publisher: CSIRO Publishing
    Publication Date: 1979
    detail.hit.zdb_id: 2178508-9
    detail.hit.zdb_id: 1474434-X
    Location Call Number Limitation Availability
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