摘要:

AbstractPhotographic photometric measurements of 2 arcsec resolution of the central regions of M82 are presented in the three coloursU, B, V. The observed light is decomposed into two parts: stellar light and light from the central source scattered by dust. The variation of the reddening of both components is derived.The dust distribution pattern is different near the spatial centre of M82 and farther out. The equator of the dust complex obscuring the central source is inclined to the overall symmetry plane of M82. The outer dust clouds responsible for the obscuration of the visible stellar light are probably arranged in a spiral‐like fashion; the “plane” containing these clouds is strongly warped and distrubed.The light of the bright knots A and C consists to a considerable part of scattered light from the central source nearly behind them.Hαlight and scattered continuum light is strongly correlated in M82, pointing to an ionisation of the gas by the source of this continuum in addition to the presence of scatte

ISSN:0004-6337    

DOI:10.1002/asna.2113050402

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractThe investigation of the distributions of number densities and radial velocities in the Coma cluster led us to the conclusion that this cluster possesses substructures. This result is in agreement with corresponding results for the Hydra I cluster and the Perseus cluster and with former conclusions by different authors that substructures are a typical phenomenon for a high percentage of all clusters of galaxies.

ISSN:0004-6337    

DOI:10.1002/asna.2113050403

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113050404

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractThe intensity behaviour of gravitationally focused (de‐focused) scalar massive matter φ(xϱ) generating the focusing (defocusing) spacetime via Einstein's equation is investigated in different collapse regions (weak collapse, strong and weak dynamical collapse domain in the region of strong collapse). The dynamical collapse of, in general, non‐geodesic moving matter φ is braked by de‐focusing effects inherent in field theoretic description. If the intensity is greater than definite bounds at significant states, the collapsing matter φ cannot be stopped by de‐focusing caustic diffraction before singular states of matter φ and curvatureRμvare reached; this singularities could be related to the notion physica

ISSN:0004-6337    

DOI:10.1002/asna.2113050405

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113050406

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractWe derive an upper bound on neutron star masses by using model equations of state in the nuclear matter density region and the causality limited equation of state in the ultradense region. Supposing that the model equations of state describe neutron star matter at nuclear matter density correctly we find as bound 3.75 M⊙. For large fiducial densities one gets a maximum mass which is above a previous estimat

ISSN:0004-6337    

DOI:10.1002/asna.2113050407

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113050408

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractAus den Ergebnissen der Zeit‐ und Breitenbestimmungen mit dem PZT in den Jahren 1972–78 wurden neue Rektaszensions‐ und Deklinationskorrektionen für den Potsdamer PZT‐Katalog berechnet. Die korrigierten Sternörter bilden den Katalog PZT 80, der im Anhang gegeben ist. Der Vergleich mit dem vorher verwendeten Katalog PZT 74 zeigt eine Qualitätsverbesserung für den neuen Katalog. Auch die systematischen Abweichungen in bezug auf den Katalog der nördlichen PZT‐Sterne NPZT 74 sind vor allem für die Deklinationen kleiner als bei

ISSN:0004-6337    

DOI:10.1002/asna.2113050409

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractThe mean diameterD= 147 ± 3 km of (106) Dione is derived from visual observations in Denmark, Germany and the Netherlands of the occultation of AGK3+ 25°0989 on 1983 January 19. Photoelectric magnitudes are:B(1, 2°.4) = 8m.51 ± 0m.06 andB – V= 0m.65 ± 0m.07. The visual albedo ispv= .064. Constraints on the axis of rotation are derived from the observed elliptical c

ISSN:0004-6337    

DOI:10.1002/asna.2113050410

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113050411

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY