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<p class="art-type" id="articleinfo">Research Article</p>
<p class="art-title">The Impact of Magnetic Dipole Radiation and Decay on the Variation of Period and Inclination Angle of Pulsars</p>
<p class="art-author"><?php $authors="Lin-Sen Li<sup>*</sup>"; echo (stristr($authors,$coauthor))?str_replace($coauthor,"<a href='".$extpath."authors/".$courl."' target='_blank'>".$coauthor."</a>",$authors):$authors; ?></p>
<p class="art-affl">School of Physics, Northeast Normal University, Changchun,  China</p>
<p class="art-aff"><b>*Corresponding author: <?php $corresponding_author="Lin-Sen Li"; echo ($coauthor!="" && $coauthor==$corresponding_author)?"<a href='".$extpath."authors/".$courl."' target='_blank'>".$coauthor."</a>":$corresponding_author;?></b>, Professor, School of Physics, Northeast Normal University, China, E-Mail: <a href="mailto:dbsd-lls@163.com">dbsd-lls@163.com</a></p>
<p class="art-aff"><b>Received:</b> October 30, 2019 <b>Accepted:</b> November 25, 2019 <b>Published:</b> December 3, 2019</p>
<p class="art-aff"><b>Citation:</b> Li LS. The Impact of Magnetic Dipole Radiation and Decay on the Variation of Period and Inclination Angle of Pulsars. <i>Int J Phys Stud Res</i>. 2019; 2(1): 78-80. doi: <a href="https://doi.org/10.18689/ijpsr-1000111">10.18689/ijpsr-1000111</a></p>
<p class="art-aff"><b>Copyright:</b> &copy; 2019 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</p>
<p><a href="<?php echo $extpath;?><?php echo $jres['journal_link'];?>/ijpsr-1000111.pdf" class="btn btn-danger pull-right" target="_blank">Download PDF</a></p>
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<p class="art-subhead" id="abstract">Abstract</p>
<p class="art-para">The change of pulsar period and inclination angle under the braking of magnetic radiation and magnetic decay is studied. The system of equations of evolution of period and inclination angle is given and solves it. The solution shows that the period increases and inclination angle decreases with time under the braking of magnetic radiation and decay. The numerical results for the change of period and inclination angle of PSR0531+21 are given. The discussions are drawn.</p>
<p class="art-para"><b>Keywords:</b> Pulsar; Period and inclination angle; Braking of magnetic radiation and Decay; Change.</p>
<p class="art-subhead" id="intro">Introduction</p>
<p class="art-para">When pulsar was born, the gravitational radiation plays a leading role in 81 year <a href="#1" id="ref1">[1]</a>. Afterward, the magnetic radiation plays a second role in a life of pulsar. In this stage pulsar rotation is very fast and its rotational energy is very large and its magnetic field is very stronger, but the rotational energy and the magnetic field also are small and weakness with time gradually. It is well known that the rotational energy may transforms to pulsar radiation energy and the weakness of magnetic field may result in the magnetic moment decay. Other hand the magnetic radiation and magnetic decay result in prolong of period and decrease of obliquity angle with time.</p>
<p class="art-para">In the past years some authors researched these topics, such as, Ostriker and Gunn <a href="#1" id="ref1">[1]</a>, Davns & Goltstein <a href="#2" id="ref2">[2]</a>, Wang et al. <a href="#3" id="ref3">[3]</a>, Heansel et al. <a href="#4" id="ref4">[4]</a>, Mira et al. <a href="#5" id="ref5">[5]</a>, Urpin & Gil <a href="#6" id="ref6">[6]</a>, Philippov et al. <a href="#7" id="ref7">[7]</a>. The research of these authors is very desirable and devisable. Based on these researches, the present paper combines concrete pulsar for researching the evolution of the period and obliquity angle under braking of magnetic radiation and magnetic decay.</p>
<p class="art-para"><b>The Change of Pulsar Period and Inclination Angle under the Braking of Magnetic Dipolar Radiation</b></p>
<p class="art-para">Philippov et al. provided a method for studding the evolution of period and obliquity angle of pulsar under braking of magnetic radiation and decay. This paper cited the system of equations with angular velocity &#937; and inclination angle &#945; <a href="#7" id="ref7">[7]</a>.</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e001.gif" class="img-responsive center-block"/></div><br/>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e002.gif" class="img-responsive center-block"/></div>
<p class="art-para">where I dettes the moment of inertia. The Z-compo net of toque, <i>K<sub>z</sub></i>, act opposite to &#937; , <i>K<sub>x</sub></i> component act perpendicular to &#937; .</p>
<p class="art-para">According to Philippov et al. <a href="#7" id="ref7">[7]</a></p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e003.gif" class="img-responsive center-block"/></div><br/>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e004.gif" class="img-responsive center-block"/></div><br/>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e005.gif" class="img-responsive center-block"/></div>
<p class="art-para">&#956; is magnetic moment<br/>Substitution of (3), (4) and (5) into (1) and (2), we obtain</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e006.gif" class="img-responsive center-block"/></div><br/>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e007.gif" class="img-responsive center-block"/></div><br/>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e008.gif" class="img-responsive center-block"/></div>
<p class="art-para">By letting <img src="<?php echo $imgpath;?>images/ijpsr-111-te01.gif" />. P is period of pulsar.<br/>The equations (6) and (7) become as</p>
<img src="<?php echo $imgpath;?>images/ijpsr-111-e009.gif" class="img-responsive center-block"/><br/>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e010.gif" class="img-responsive center-block"/></div>
<p class="art-para">The equations (9)-(10) can be given</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e011.gif" class="img-responsive center-block"/></div>
<p class="art-para">Integrating the above equation</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e012.gif" class="img-responsive center-block"/></div>
<p class="art-para">The equation (10) can be written by using (12):</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-te02.gif" class="img-responsive center-block"/></div>
<p class="art-para">Integrating the above equation</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e013.gif" class="img-responsive center-block"/></div><br/>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e014.gif" class="img-responsive center-block"/></div>
<p class="art-para">Substituting the above expression into the first expression of (12), we obtain the change of period of pulsar</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e015.gif" class="img-responsive center-block"/></div>
<p class="art-para">The expressions (14) and (15) are that the change of period and inclination angle with time under the braking of the magnetic radiation.</p>
<p class="art-para"><b>The Change of the Period and Inclination Angle under the Braking of the Magnetic Decay</b></p>
<p class="art-para">We assume that the magnetic moment of pulsar decays with the exponent, i. e</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e016.gif" class="img-responsive center-block"/></div>
<p class="art-para">&#958; is the coefficient of the magnetic decay. <i>&#956;<sub>0</sub>=R<sup>3</sup>B<sub>0</sub></i>. Substituting (16) into the equation (13) and integrating it</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e017.gif" class="img-responsive center-block"/></div>
<p class="art-para">Substituting the above expression into the first expression of (12), we obtain</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-e018.gif" class="img-responsive center-block"/></div>
<p class="art-para">The expressions of (17) and (18) are that the change of period and obliquity angle with time under their braking of the magnetic decay.</p>
<p class="art-subhead" id="numresults">Numerical Results</p>
<p class="art-para">This paper uses the formulae (14)&#8211;(15) and (17)&#8211;(18) to calculate the change of the period and magnetic inclination angle under the braking of magnetic radiation and magnetic decay for PSR0531+21 (Crab pulsar) <a href="#8" id="ref8">[8]</a>. Its period P<sub>0</sub>=0.033058(s), and magnetic field <i>B</i><sub>0</sub>=3.78 &#215; 10<sup>12</sup><i>G</i> cited from Manchestefer et al. <a href="#9" id="ref9">[9]</a>. It&#700;s obliquity angle &#945;<sub>0</sub>=59&#176;.2 cited from Davis and Goldstein <a href="#2" id="ref2">[2]</a>. <i>I</i>=1.4 &#215; 10<sup>45</sup> (<i>g.cm</i><sup>2</sup>) <a href="#8" id="ref8">[8]</a>, <i>R</i>=1.2 &#215; 10<sup>6</sup> <i>cm</i>. <a href="#3" id="ref3">[3]</a>, &#958;=1.1111 &#215; 10<sup>-6</sup>/<i>yr</i> <a href="#3" id="ref3">[3]</a>.</p>
<div class="art-img">
<img src="<?php echo $imgpath;?>images/ijpsr-111-te03.gif" class="img-responsive center-block"/></div>
<p class="art-para">Substituting these data into the formulae (14)-(15) and (17)-(18), the numerical results are listed in <a href="#t001">tables 1</a> and <a href="#t002">2</a>.</p>
<div class="art-img" id="t001">
<img src="<?php echo $imgpath;?>images/ijpsr-111-t001.gif" class="img-responsive center-block"/></div><br/>
<div class="art-img" id="t002">
<img src="<?php echo $imgpath;?>images/ijpsr-111-t002.gif" class="img-responsive center-block"/></div>
<p class="art-subhead" id="discussion">Discussion and Conclusion for Numerical Results</p>
<p class="art-para">(1) It can be seen from <a href="#t001">tables 1</a> and <a href="#t002">2</a> that the period increases and inclination angle decreases with time under the magnetic radiation and magnetic decay.<br/> (2) However the increase of period and decrease of inclination angle under the braking of magnetic decay are larger than that under the braking of magnetic radiation.<br/> (3) The decrease of magnetic radiation is due to the rotational energy loss and the magnetic decay is due to the weakness of magnetic field with time. Hence the increase of period and decrease of the magnetic inclination angle are due to the rotational energy loss and the weakness of the magnetic field of pulsar.<br/> (4) The pulsar PSR0531+21 speeds up suddenly due to stellar quake (glitches) in three years <a href="#10" id="ref10">[10]</a>. However it is temporary happening and it is not secular happening. It does not influence the secular variation of period and inclination angle due to the braking of magnetic radiation and magnetic decay.</p>
<p class="art-subhead" id="references">References</p>
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