摘要:

AbstractThe paper presents results for deriving analytic solutions of the non‐relativistic linear perturbation equations, which govern the evolution of inhomogeneities in a homogeneous spatially flat multi‐component cosmological model. The multi‐component dark matter problem is rev

ISSN:0004-6337    

DOI:10.1002/asna.2113120102

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractMixing of all possible partitions of a given mass with equal weights leads to a Bose‐Einstein mass spectru

ISSN:0004-6337    

DOI:10.1002/asna.2113120103

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe physics of the superconducting cosmic string appearing in the superstring theory withE8×E8, gauge group was considered. The possible interpretation of such astrophysical objects as quasars, the new class of supernova remnanis, 0.511 MeV intense annihilation line and the exotic binary system SS 433 has been given basing on this string theory

ISSN:0004-6337    

DOI:10.1002/asna.2113120104

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113120105

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractThe unusual brightening of the RSCVn‐type variable SV Cam reported by PATKOS(1982a) is analysed. We base our analysis on the assumption of a temporarily existing bright spot which appeared on the primary star of the binary system. A location near the stellar equator and a spot radius of 70° are derived. According to our analysis, the temperature difference between the spot and its surroundings was up to 110 K. The spot's existence is related to an observed change of the orbital period. Both findings are interpreted as caused by mass exchange resp. accreti

ISSN:0004-6337    

DOI:10.1002/asna.2113120106

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113120107

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractPopulations of highly‐excited states of hydrogen in gaseous nebulae are calculated including effects of lowering the atomic ionization potential. Factorsbnand dlnbn/dnwere computed for a large range of temperature and densities. Collisions only between adjacent levels (Δn= ±1) were included in the set of the statistical balance equations. Results predict the existence of a negative branch of the dlnbn/dncurve. They have to be taken into account in calculating the nebulae mod

ISSN:0004-6337    

DOI:10.1002/asna.2113120108

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113120109

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

摘要:

AbstractAn intermediate stage of magnetic field evolution in kinematic dynamo systems, during which the growing field does not coincide with the leading eigensolution, can be physically important in those cases, if the difference of the growth rates of individual dynamo eigenfunctions is small in comparison with the growth rates themselves. The eigenvalue problem is also insufficient for complete analysis of evolution of an initial distribution of magnetic field which is initially concentrated within a small portion of the dynamo volume. In this case there arise magnetic fronts which spread over the whole volume. Here we solve the Cauchy problem, which describes such situations, for the case of helical axisymmetric flow, the screw dynamo.We consider evolution of an initially small magnetized region (called here a “blob” or “magnetic packet”) embedded in the axisymmetric helical flow. A prototype of such flow is a helical flow in a tube or a swirling jet. As shown below, the group velocity of such magnetic packet is equal to the fluid velocity at the radius where the eigenfunction concentrates which has the maximal growth rate. The field within the packet grows at this rate. On the contrary, the growth rate of the field outside the packet (within the jet) grows at another rate given by the growth rate of the eigenfunction which has the minimal oscillation frequencyv, i.e. dv/dk= 0, wherekis the longitudinal wave number. If the latter growth rate is negative, the field within the jet decays and the growing magnetic packet moves through the jet leaving it unmag

ISSN:0004-6337    

DOI:10.1002/asna.2113120110

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113120111

出版商:WILEY‐VCH Verlag    

年代:1991

数据来源: WILEY