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  • 1
    Electronic Resource
    Electronic Resource
    Absorption spectrum of the accretion column in VV puppis (1979)
    [s.l.] : Nature Publishing Group
    Nature 281 (1979), S. 47-48 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observations were obtained using the image dissector scanner8 modified as a polarimeter at the //15 Cassegrain focus of the 4-m Anglo-Australian telescope. Full details of the scanner-polarimeter system which is similar to that described by Nordsieck9 will be given elsewhere. We obtained 12 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/281047a0
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  • 2
    Electronic Resource
    Electronic Resource
    UV observations of X-ray sources 2A0311–227 and 2A0526–328 (1981)
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 119-120 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The IUE observatory9 has long wavelength (1,900-3,200 Å) and short wavelength (1,100-1,900 Å) cameras and two resolution modes (10 and 0.2 Å). The images obtained in this observation were taken during an 8-h period starting at 20.00 UT on 24 July 1980 and were all at low ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/290119a0
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  • 3
    Electronic Resource
    Electronic Resource
    Diffuse interstellar absorption bands between 2.9 and 4.0 µm (1981)
    [s.l.] : Nature Publishing Group
    Nature 294 (1981), S. 239-240 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Because of the strong and variable telluric absorption features in the waveband of interest, we now describe our observing methods in some detail. We used the IR photometer-spectrometer at the //15 focus of the 3.9-m Anglo-Australian Telescope. In this instrument a circular variable filter (CVF) is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/294239a0
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  • 4
    Electronic Resource
    Electronic Resource
    The 3.4-µm interstellar absorption feature (1980)
    [s.l.] : Nature Publishing Group
    Nature 287 (1980), S. 518-519 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The presence of a possible absorption feature in the wavelength region 3.3-3.5 ?? in the published spectra of some highly obscured IR sources was considered by Hoyle and Wickramasinghe3 to be evidence for the -3.4-?? stretching vibration band of CH, which is characteristic of most organic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/287518a0
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  • 5
    Electronic Resource
    Electronic Resource
    Gas streaming in 2U0900-40 and Cyg X-1 (1974)
    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 25-27 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Published photometric data on 2U0900-40 and Cyg X-1 are interpreted as evidence of gas streaming in these systems. The location and extent of the gas streams indicate that they originate from the accretion disk and extend to the far side of the primary. We suggest that large scale mass loss is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/251025a0
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  • 6
    Electronic Resource
    Electronic Resource
    The periodic transient X-ray sources (1975)
    [s.l.] : Nature Publishing Group
    Nature 258 (1975), S. 502-503 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We assume that neutron stars are born rotating rapidly. Illarionov and Sunyaev5 have shown that a magnetic, rotating neutron star will spin down in a stellar wind by a combination of the pulsar emission and 'propeller' mechanisms to an equilibrium period Peq at which the Alfven radius is equal to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/258502a0
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  • 7
    Electronic Resource
    Electronic Resource
    Discovery of organic grains in comet Wilson (1987)
    [s.l.] : Nature Publishing Group
    Nature 329 (1987), S. 615-616 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observations were made with the 3.9-m Anglo-Australian Telescope (AAT), using the infrared photometer-spectrometer in its spectroscopic mode. The data acquisition was similar to that used for comet Halley5 with a single exception. Because comet Wilson was considerably fainter than Halley, we ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/329615a0
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  • 8
    Electronic Resource
    Electronic Resource
    The period gap and the AM Herculis type systems (1994)
    Springer
    Astrophysics and space science 211 (1994), S. 61-70 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We argue that the period distribution of AM Herculis binaries in the enlarged sample incorporating results from the recent ROSAT X-ray survey differs significantly from that of other cataclysmic variables. In particular, there is no evidence for a pronounced period gap at 2—3 hr and the significance of the period spike at about 114 min is brought into question. We present an alternative evolutionary scenario for the AM Herculis binaries based on the hypothesis that magnetic braking by the stellar wind of the M star secondary either ceases or is severely curtailed when the rotation of the magnetic white dwarf becomes synchronised with the orbital motion, The orbital evolution of the AM Herculis binaries is thereafter driven mainly by angular momentum loss due to gravitational radiation. This scenario not only explains the higher proportion of AM Herculis binaries in the period gap when compared with other cataclysmic variables but also provides a natural explanation for the low mass transfer rates in these binaries and for the existence of an apparent upper limit for the surface magnetic fields of their white dwarfs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658043
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  • 9
    Electronic Resource
    Electronic Resource
    Three components of 3–4 μm absorption bands (1983)
    Springer
    Astrophysics and space science 97 (1983), S. 369-378 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present 2–4 μm spectra of six infrared sources for which the extinction is not purely interstellar, but is dominated by circumstellar or molecular cloud dust. In all cases the absorption bands differ from the interstellar case, though a component of the interstellar absorption is often present. We also present an improved absorption spectrum for the galactic centre source IRS 7, correcting spurious features in our previous spectrum. Three independent components can be identified: (i) The interstellar component, probably of organic origin, and itself not necessarily invariant; (ii) The symmetrical water ice feature at 3.06 μm, found most commonly in molecular clouds; (iii) A component at 3.53 μm possibly identified with solid formaldehyde grains, and seen only in molecular clouds because of its weakness. Other absorption components appear to be unrelated to those in the 3–4 μm region, most notably the 10 μm absorption found in oxygen-rich giants and the interstellar medium, and presumable inorganic in nature. Our observations include the first detection of water ice absorption in a source in the ρ Oph dark cloud. Biological materials provide the best fit to the interstellar case, but do not presently account for the distinct 3.53 μm component. We stress the need for further laboratory experiments using simpler organic materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653492
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  • 10
    Electronic Resource
    Electronic Resource
    Infrared spectroscopy over the 2.9–3.9 μm waveband in biochemistry and astronomy (1982)
    Springer
    Astrophysics and space science 83 (1982), S. 405-409 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The infrared spectrum of the galactic centre source IRS 7 over the 2.9–3.9 μm waveband is interpreted as strong evidence for bacterial grains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648568
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