Editing Neutron star (section)

===Spin up===
[[File:Neutron Star X-ray beaming with accretion disk.jpg|thumb|A computer simulation depicting a neutron star with accretion disk, spewing out X-rays through the magnetic axis]]
{{Main|Neutron star spin-up}}
Neutron star rotational speeds can increase, a process known as spin up. Sometimes neutron stars absorb orbiting matter from companion stars, increasing the rotation rate and reshaping the neutron star into an [[oblate spheroid]]. This causes an increase in the rate of rotation of the neutron star of over a hundred times per second in the case of millisecond pulsars.

The most rapidly rotating neutron star currently known, [[PSR J1748-2446ad]], rotates at 716 revolutions per second.<ref>{{Cite journal |arxiv = astro-ph/0601337|last1 = Hessels|first1 = Jason W. T|title = A Radio Pulsar Spinning at 716 Hz|journal = Science|volume = 311|issue = 5769|pages = 1901–1904|last2 = Ransom|first2 = Scott M|last3 = Stairs|first3 = Ingrid H|last4 = Freire|first4 = Paulo C. C|last5 = Kaspi|first5 = Victoria M|last6 = Camilo|first6 = Fernando|year = 2006|doi = 10.1126/science.1123430|pmid = 16410486|citeseerx = 10.1.1.257.5174|bibcode = 2006Sci...311.1901H|s2cid = 14945340}}</ref> A 2007 paper reported the detection of an X-ray burst oscillation, which provides an indirect measure of spin, of 1122&nbsp;[[Hertz|Hz]] from the neutron star [[XTE J1739-285]],<ref name="KaaretPrieskorn2007">{{cite journal|last1=Kaaret|first1=P.|last2=Prieskorn|first2=Z.|last3=Zand|first3=J. J. M. in 't|last4=Brandt|first4=S.|last5=Lund|first5=N.|last6=Mereghetti|first6=S.|last7=Götz|first7=D.|last8=Kuulkers|first8=E.|last9=Tomsick|first9=J. A.|title=Evidence of 1122 Hz X-Ray Burst Oscillations from the Neutron Star X-Ray Transient XTE J1739-285|journal=The Astrophysical Journal|volume=657|issue=2|year=2007|pages=L97–L100|issn=0004-637X|doi=10.1086/513270|arxiv=astro-ph/0611716|bibcode=2007ApJ...657L..97K|s2cid=119405361}}</ref> suggesting 1122 rotations a second. However, at present, this signal has only been seen once, and should be regarded as tentative until confirmed in another burst from that star.