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  • 1
    Electronic Resource
    Electronic Resource
    The historical record for Sirius: evidence for a white-dwarf thermonuclear runaway? (1986)
    [s.l.] : Nature Publishing Group
    Nature 324 (1986), S. 235-237 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two evolutionary problems remain in the Schlosser and Bergmann evolutionary picture. First, the implied cooling time for the white dwarf, Sirius B, is several orders of magnitude too short to be explained by current theories of white-dwarf cooling. For example, current predictions indicate that the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/324235a0
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  • 2
    Electronic Resource
    Electronic Resource
    On the mass-luminosity relation (1972)
    Springer
    Astrophysics and space science 17 (1972), S. 134-149 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of a least-squares study of the mass-luminosity relation for eclipsing and visual binary stars consisting of main sequence components are presented. Two methods are discussed. In Part A, the values of the coefficientsA andB in the relation logM=A+BM Bol are determined. Part B presents a technique which permits the determination of α and β in the relationM=αL β, when only the sum of the masses, and not the individual masses of each component, is known. The results and a comparison of the two methods are discussed. It is found that the following massluminosity relation represents the observational data satisfactorily: $$log M = 0.504 - 0.103M_{BOL,} {\text{ }} - \leqslant M_{BOL} \leqslant + 10.5$$ . A discussion of the data and of the possibility that separate mass-luminosity relations may exist for visual and eclipsing binaries is given. The possiblity that more than one mass-luminosity relation is required in the range −8≤M Bol ≤+13 is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642548
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  • 3
    Electronic Resource
    Electronic Resource
    On the physical parameters for Centaurus X-3 and Hercules X-1 (1972)
    Springer
    Astrophysics and space science 19 (1972), S. 279-284 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Upper and lower limits on the physical parameters for Cen X-3 and Her X-1 have been computed from a simple assumption involving the mass function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645712
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  • 4
    Electronic Resource
    Electronic Resource
    On the formation of a neutron star in a close binary system (1971)
    Springer
    Astrophysics and space science 10 (1971), S. 464-470 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effects on a close binary system of one component becoming a neutron star as a result of a supernova explosion are discussed in this paper. In the case of a Type I supernova, the system can remain bound in many cases of interest. For a Type II supernova, the system will probably be disrupted although in some cases a remnant of the companion to the supernova may remain in a bound orbit. Consequently, neutron stars formed in Type I supernova explosions may exist in close binary systems. Such systems may be strong X-ray emitters due to mass flow as suggested by Shklovsky. Photons with energies in the 1–50 MeV region should also be emitted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649689
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  • 5
    Electronic Resource
    Electronic Resource
    On the mass determination of collapsed objects in close binaries: Applications to black-holes and neutron stars (1974)
    Springer
    Astrophysics and space science 27 (1974), S. 293-301 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observational information required for determination of the masses of collapsed objects in close binaries is examined. Assumptions commonly used to evaluate the masses or thier lower limits, in the absence of the required observational data, are critically discussed. A reliable determination of the mass of a collapsed object in X-ray emitting binaries is yet to be made. No definitive case has been made for or against the existence of a black-hole in CygX-1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643878
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  • 6
    Electronic Resource
    Electronic Resource
    On the emission of neutrinos and gravitational waves in the formation of neutron stars (1977)
    Springer
    Astrophysics and space science 51 (1977), S. 187-196 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energetics involved in the formation of neutron stars in close binaries as a result of supernova explosions are considered. The gravitational binding energy of the neutron star must find proper outlets. The mass ejection and cosmic ray particles can carry away only a small fraction (up to a few per cent) of this energy. Most of the binding energy goes into rotational kinetic energy, gravitational radiation and neutrino emissions. A scenario is considered in which most of the gravitational binding energy goes into rotational kinetic energy and is, ultimately, radiated away as gravitational waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642469
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  • 7
    Electronic Resource
    Electronic Resource
    On the possibility of a geocoronal contribution to the celestial soft X-ray background (1974)
    Springer
    Astrophysics and space science 30 (1974), S. 123-126 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The possibility is investigated that a significant fraction of the X-ray background in the energy range 0.2–0.28 keV originates in the geocorona through bremsstrahlung. It is concluded that the geocoronal flux must be substantial at some times and the possibility exists that an observable geocoronal background exists at all times. The existing data on the soft X-ray background is found to be compatible with the hypothesis of a geocoronal component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645757
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  • 8
    Electronic Resource
    Electronic Resource
    Foreword (1987)
    Springer
    Astrophysics and space science 130 (1987), S. 1-2 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654966
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  • 9
    Electronic Resource
    Electronic Resource
    The ultraviolet spectra of four binaries observed with the S59 spectrometer (1977)
    Springer
    Astrophysics and space science 46 (1977), S. 379-387 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ultraviolet spectra ofo And, α CrB, η Ori A and α Vir, which were obtained with the S59 spectrometer at a resolution of 1.7 Å in three 100 Å wide regions centered at 2110, 2454 and 2825 Å, have been studied for the presence or the absence of the effects due to their binary nature. As may have been anticipated from their orbital and other characteristics, no indication of strong binary interactions were seen in these observations. However, there are certain spectral peculiarities suggesting the possibility of modifications of spectral classifications for some of these objects. A rather unusual spectral behavior in α Vir is also noted. In addition, based primarily on the reviewing of the available literature, we draw new attention to a remarkable property of the third component in η Ori A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644385
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  • 10
    Electronic Resource
    Electronic Resource
    High temperature plasma inβ Lyrae, observed fromCopernicus (1975)
    Springer
    Astrophysics and space science 38 (1975), S. 353-358 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-resolution ultraviolet spectrophotometry of the complex close binary systemβ Lyrae was performed with the Princeton Telescope Spectrometer onCopernicus. Observations were made at phases 0.0, 0.25, 0.5, and 0.75 with the resolution of 0.2 Å (far-ultraviolet) and 0.4 Å (mid-ultraviolet). The far-ultraviolet spectrum is completely dominated by emission lines indicating existence of high temperature plasma in this binary. The spectrum ofthis object is unlike any other object observed fromCopernicus. It is believed that this high temperature plasma results from dynamic mass transfer taking place in this binary. The current results are compared with the OAO-2 Wisconsin Experiment Package observations and other observational results. The possibility that the secondary component is a collapsed object is also discussed; theCopernicus observations are consistent with the hypothesis that the spectroscopically invisible secondary component is a black hole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647134
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