摘要:

AbstractThe physical nature of 277 ultraviolet excess objects of the third Asiago field (22 square degrees, 15 ≦mpg≦ 18,U–B≦≦ ‐0.2) is investigated on the basis of objective prism plates. Most of them are stars, 8% are quasar candidates and 7% compact galaxies. The proportions of different kinds of objects changes with the magnitude andU–Bcolour index. The surface density of quasars is estimated to be between 0.5 Q/sq. deg. and 1.0 Q/sq. deg. for the UVX A3objects.The results of the A3field (located in the Virgo cluster of galaxies) statistically agree with the ones of the A1field, outside cluster

ISSN:0004-6337    

DOI:10.1002/asna.2113050302

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113050303

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractThe investigation of the distribution of number densities and radial velocities in the Perseus cluster led us to the conclusion that this cluster possesses dominant substructures. This result is in agreement with a corresponding result for the Hydra‐I cluster and with former conclusions of different authors that substructures are a typical phenomenon for a high percentage of all clusters of galaxies. The complex of the Perseus cluster has a diameter of 60–80 minutes of

ISSN:0004-6337    

DOI:10.1002/asna.2113050304

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractAn integral equation is derived for a mean magnetic field in a random velocity field that renovates after a characteristic time τ. It is shown that in two cases, i.e. when (a) the correlation time is short, τ

ISSN:0004-6337    

DOI:10.1002/asna.2113050305

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113050306

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractOrbital elements of the visual binary star ADS 10075 are given. The dynamical parallax and total mass of the system have been calculated.

ISSN:0004-6337    

DOI:10.1002/asna.2113050307

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractDetermination of cluster luminosity functions require separation of cluster members from the stellar background. Methods of selecting true members from projected field stars in the same area usually suffer from selection effects. Selection effect arising from utilizing membership probabilities to discrminate between field and cluster stars are discussed. A small excess of interstellar absorption in a cluster area could cause serious bias if one utilizes statistical subtraction. Such bias in statistical filtering is studied on a numerical example. A filtering procedure is described to prove the presence of cluster in the given sample. This procedure yields, as byproduct, the cluster radius as well. Evidence is presented that the luminosity functions of SANDAGE(1957) and TAFF(1974) may suffer from bias.

ISSN:0004-6337    

DOI:10.1002/asna.2113050308

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractTest observations with the new two‐channel photometer performed on the 125 cm telescope of Abastumani Observatory are describe

ISSN:0004-6337    

DOI:10.1002/asna.2113050309

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractObservations and light curves of the variable star AM Her observed in thebandvproper color system of the Abastumani two‐channel photometer are presente

ISSN:0004-6337    

DOI:10.1002/asna.2113050310

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113050311

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY