摘要:

AbstractIt is shown in an idealized αω‐dynamo model that a finite flux density not only is able to prevail against its own backreaction on the generating mechanism but can even make the dynamo more responsive to excitation and enable it to run subcritica

ISSN:0004-6337    

DOI:10.1002/asna.2103010502

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractIn dieser Arbeit wird die Radialgeschwindigkeit des Sternes 68 Tau in Abhängigkeit von der Periode des Lichtwechsels untersucht. Es wurden keine Radialgeschwindigkeitsvariationen festgestellt. Die mittlere Radialgeschwindigkeit von 22 Spektren beträgt 40.4 km/s ±0.7 km

ISSN:0004-6337    

DOI:10.1002/asna.2103010503

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractDcr δ Scuti Stem HD 181 333 wurde im Sommer 1979 in drei NHchten mit dem Z\villi, ngstelrskop im irbu‐System beobachtet. Es konnte eine Periode von 0.1277 Tagen bestimmt werden.The δ Scuti star HD 181 333 was observed in summer 1979 during thrce nights with the twin telescope in rrbu‐system. A period of 0.1277 days was

ISSN:0004-6337    

DOI:10.1002/asna.2103010504

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractOn the basis of 55 Zeeman spectrograms obtained at Tautenburg in the years 1975–1979 the effective magnetic fields and the radial velocities of the supergiant ν Cep (HD 207260) were determined. For the effective magnetic field a slow variation occurring on a time scale of years was found. The spectrograms taken at the first time show only moderate effective magnetic field strengths of a few hundred Gauß, but in the year 1978 values of +2000 Gauß were detected.The measured radial velocities show a longtime variability similar to that of the magnetic field as well as more rapid changes. A periodical variation of the radial velocity with a period of ∼ 39.9 days, perhaps produced by the rotation of the star, is indicated. The Balmer absorption lines Hβ, Hβ, and Hδhave different radial velocities refering to the presence of an expanding envelope. Moreover, there exist significant differences between the velocities of various elements respectively ions of

ISSN:0004-6337    

DOI:10.1002/asna.2103010505

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractWe present a surface photometry of M 82 of medium spatial resolution. Special attention was paid to good systematic photometric accuracy. The results are discussed in terms of the distribution of intensity, colour, reddening free parameteerQand colour excessb‐V.The bright elongated body of the galaxy consists of a moderately old stellar population (1 – 3 · 109a) and is only slightly reddned with the exception of the central absorption lane and the southern central region. The chaotic fan‐like disturbance south of the center shows the colours of a very young (106– 107a) highly reddened group of stars; according to polarimetric data from the literature we see their light scattered by dust.The population indexQof the inner halo is bluer than that of the disc everywhere (with the possible exception of the extreme western part). Two sources must be responsible for the illumination of the halo; one of them is responsible for the light from the great disturbances near the minor axis. Both may be located near center but must be partly shadowed. A major contribution of the disc to the illumination is less probable because the population index is different in most places of the halo from that of the disc.In addition to the dusty halo, obscuring dust is probably located to the south of the galaxy. This can be interpreted as part of a thick disc of dust embedding the stellar disc or as beeing connected to a proposed strip of B stars at the southern boundary of the visible disc. Both these interpretations lead to opposite results concerning the direction of the inclination of the disc. The inclination itself is estimated to lie between 80

ISSN:0004-6337    

DOI:10.1002/asna.2103010506

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractDie Bahnelemente der Doppelsterne ADS 102 und ADS 281 wurden bestimmt. Die vorläufigen Elemente, die nach der Metheode von KOWALSKYerhalten wurden, sind dann mit der Differenzen‐Korrektionsmethode von HELLERICHverbessert worden. Endlich wurden die dynamische Parallaxe und die Gesamtmasse der Systeme berechn

ISSN:0004-6337    

DOI:10.1002/asna.2103010507

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractDie Bahnelemente der Doppelsterne ADS 161, ADS 2236 und ADS 8739 wurden bestimmt. Die verläufigen Elemente, die nach der Methode von KOWALSKYerhalten wurden, sind dann mit der Differenzen‐Korrektionsmethode von HELLERICHverbessert worden. Endlich wurden die dynamische Parallaxe und die Gesamtmasse der Systeme berechn

ISSN:0004-6337    

DOI:10.1002/asna.2103010508

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe orbit of minor planet (1370) Hella, which was supposed to be almost hopelessly lost since the discovery apparition in 1935, is rediscussed. The old plates have been remeasured and reduced anew and the object was recoverd in December 1979 by means of these elements. An improved orbit based on 11 positions 1935–1979 is give

ISSN:0004-6337    

DOI:10.1002/asna.2103010509

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe table contains topocentric positions of several minor planets. The coordinates are given for the epoch 1950.0

ISSN:0004-6337    

DOI:10.1002/asna.2103010510

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2103010511

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY