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  • 1980-1984  (9)
  • 1970-1974  (1)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Close binary systems before and after mass transfer. II.Semi-detached systems (1980)
    Springer
    Astrophysics and space science 72 (1980), S. 411-432 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent data on semi-detached systems are compared with general results of close binary computations to determine the origin of Algol-type systems (classical case A and case B results are considered). Both the conservative and the non-conservative mode of mass exchange are investigated. It is found that the assumption of considerable mass loss from the system gives satisfying agreement with the observations. It is also concluded that the calculation of an extensive homogeneous network of case A computations is needed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00639147
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and evolution of large groups of Massive Close Binary systems (1982)
    Springer
    Astrophysics and space science 87 (1982), S. 357-375 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the definition of four important events in the evolution of Massive Close Binary systems, we define five observable evolutionary phases in the life of a Massive Close Binary system: OB+OB, WR+OB, C+OB, C+WR, and WR+WR. We define and compute a number of observable phenomena for large groups of Massive Close Binaries. For one burst of star formation, we compute the number of systems in different evolutionary phases, and the total mass loss as functions of the time. For continuous star formation, we determine the fraction of WR binary stars, occurring in different phases of massive close binary evolution, and a number of average quantities (mass, mass ratio) of WR binary systems. The results are compared with observations of WR binaries in the Galaxy and in Open Clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648930
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Semi-detached binaries: The origin and present status of TU Mon, SX Cas, and DM Per (1984)
    Springer
    Astrophysics and space science 99 (1984), S. 313-317 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An attempt is made to trace back the possible progenitor systems of the Algol-type binaries TU Mon, SX Cas, and DM Per. The present characteristics are compared to the result of the evolution of 9M 0+5.4M 0. The position of the hot components in the HRD is discussed with regard to the theoretical models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650255
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Stellar winds and mass loss of a rotating star (1972)
    Springer
    Astrophysics and space science 18 (1972), S. 128-134 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mass loss to be expected from the corona of a rotating F2-star is calculated. The rotation is supposed to be rigid up to a certain distances, as if it were maintained by a strong magnetic field. Dependent on the values of the rotational velocity the mass loss can increase to 26–40% forv rot up to 200 km s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645286
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Bifurcation points in close binary evolution: Medium-mass binaries (1982)
    Springer
    Astrophysics and space science 84 (1982), S. 447-456 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The remaining core hydrogen burning lifetime after case B of mass transfer of the secondary (mass gaining) component in a medium mass close binary star is estimated, for mediummass binaries with primaries in the mass range 5M ⊙ to 9M ⊙. From the comparison of this quantity with the helium burning time-scale of the remnant primary a critical mass ratioq c is derived such that for larger values ofq, mass transfer from the secondary towards the primary starts before the latter has evolved into a white dwarf. Consequences for the advanced stages of medium mass binaries are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651323
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Close binary systems before and after mass transfer (1982)
    Springer
    Astrophysics and space science 87 (1982), S. 377-401 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method is given to derive absolute dimensions from data of spectroscopic binary systems, with application to the 7th Catalogue of Spectroscopic Binary Systems of Battenet al. (1978). The different samples of solutions are analysed with regard to existing solutions. Absolute dimensions are given for 62 systems, not included in the tables of Popper (1980), Lacy (1979), and Giannone and Giannuzzi (1974).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648931
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    On the evolutionary time scale of the accreting component in massive close binaries (1981)
    Springer
    Astrophysics and space science 80 (1981), S. 369-395 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The remaining core hydrogen burning lifetime after mass exchange is computed for the mass gaining component in massive close binary systems. Results are obtained for various modes of mass accretion, for a wide range of initial masses and mass ratios, and for different values of mass loss from the system. The effect of mass loss by stellar wind is included. By use of general properties of massive close binary evolution, the position in time of four events is determined: the end of core hydrogen burning of the primary and the secondary, and the occurrence of the supernova of the primary and the secondary. It is found that the two supernova event occur rather close in time, compared to the Main Sequence time scales of the components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652937
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Close binary systems before and after mass transfer: A comparison of observations and theory (1980)
    Springer
    Astrophysics and space science 68 (1980), S. 433-457 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From a search through the literature 174 close binaries with known absolute dimensions have been sampled. Distinction is made between systems before and after mass exchange. Mass, period and mass ratio distributions and relations of the group of ‘unevolved’ binaries (i.e., prior to mass exchange) are transformed into corresponding distributions and relations of evolved binaries. The transformations are based upon theM 1f=g(M 1f) relation derived from an extended set of published theoretical computations of the evolution of close binaries. From this relation the following characteristics of the system after mass exchange are computed:M 1f,M 2f (andq f),P f. Five different modes of mass transfer were applied for the computation of the values ofP f andM 2f. The variation of the period was calculated using the formalism given by Vanbeverenet al. (1979). The results are compared to the observations of binary systems after mass exchange, and are discussed together with an analysis of the effect of several selection effects present in the distributions. The main conclusion is that, during mass exchange in close binaries, more than 50% of the mass is lost to the system in the process of transfer, removing a large amount of angular momentum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00639709
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Comments on V505 mon: One of the most massive binaries (1983)
    Springer
    Astrophysics and space science 95 (1983), S. 215-217 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From a discussion of the results or V505 Mon, we conclude that the spectral types contradict other parameters in the HR diagram.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00661176
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1983)
    Springer
    Space science reviews 36 (1983), S. 415-432 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204554
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    Paper (German National Licenses)
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