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Highlights of Astronomy: As presented at the XIVth General - download pdf or read online

By A. Hewish (auth.), Cornelis De Jager (eds.)

ISBN-10: 9401031029

ISBN-13: 9789401031028

ISBN-10: 9401031045

ISBN-13: 9789401031042

After an identical development because the XIII th normal meeting of the foreign Astronom­ ical Union the current quantity of the Highlights in Astronomy comprises the texts of the invited discourses given on the XIVth basic meeting held in Brighton, England, August 1970. It comprises additional the papers and dialogue feedback offered on the six joint discussions, in addition to the invited papers given on the unique consultation at the Moon. additionally this quantity includes the papers given on the joint assembly of Commissions 24, 27, 30, 33 and 37 on RR Lyrae Stars. It is going with no announcing that the approximately hundred papers revealed during this quantity symbolize just a minor a part of all topic handled on the XIVth common meeting of the Union; the various very important discussions that came about in a number of hundred fee conferences will not be incorporated. for brief abstracts and reports of those the reader is mentioned Transactions of the overseas Astronomical Union XIVB. I desire to thank those that contributed to this quantity for the rate in filing the manuscripts in their papers. This, including the potency of the Publishers allowed for a swift publication.

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Additional info for Highlights of Astronomy: As presented at the XIVth General Assembly of the I.A.U. 1970

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Pulsars with long periods (P;;:; 1 sec) might be rotating or pulsating white dwarfs. But the latter assumption is unlikely in view of the absence of optical identifications of pulsars with white dwarfs, evolutional considerations (viz. the increase of the pulsars' period with time; due to this fact short periodic pulsars in the course of time have to become long periodic) and finally the absence of indications that there exist pulsars of various types. The assumption that pulsars are members of binary systems (stars) seems to be altogether eliminated due to gravitational radiation.

Practically, however, already at negligibly small angular velocity Qc ~ (lijm nr2) In(rja)~ ~ 10- 4 sec- 1 (mn~ 10- 24 is the mass of a nucleon, r is the radius of a fluid sphere and a= 10- 12 cm is the radius of the core of a vortex line where the liquid is not yet a superfluid) the appearance of vortex lines in the rotating superfluid parallel to the rotation axis is energetically advantageous. 05 x 10- 27 erg sec. If Q ~ Q c the number of lines formed is rather large for the angular velocity of the substance to be the same as it is in the case of a normal liquid.

Its role for pulsars, of course, increases considerably due to the high values of Hand Q. For example, if Q;:;; 10 2 , r;:;; 10 6 and H~ 10 8 the field E~3 x 105;:;; 10 8 V/cm. Hence, we have a potential difference V;:;;Er;:;; 10 14 V. It is quite obvious that in the presence of such fields and even with fields, smaller by several orders of magnitude (a field can considerably decrease if the plasma atmosphere of the star is dense enough) the gravity in the atmosphere of the star is of secondary importance.

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Highlights of Astronomy: As presented at the XIVth General Assembly of the I.A.U. 1970 by A. Hewish (auth.), Cornelis De Jager (eds.)


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