By John Soars, Liz Soars
A brand new newbie version from the world's best-selling English path - a perfectly-balanced syllabus and plenty of help for newbie scholars
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Additional resources for New Headway: Beginner Third Edition: Student's Book: Six-level general English course for adults (Headway ELT)
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.
New Headway: Beginner Third Edition: Student's Book: Six-level general English course for adults (Headway ELT) by John Soars, Liz Soars