Editing Neutron star (section)

==Subtypes==
[[File:PIA23863-NeutronStarTypes-20200624.jpg|thumb|Different Types of Neutron Stars]]
[[File:Neutron star magnetic fields simulation.jpg|thumb|right|Computer renders of a neutron star with [[accretion disk]], with magnetic field lines projected, showing [[X-ray burster|bursts of powerful X-rays]]. The simulations are taken from 2017 data from NASA's NuSTAR and Swift, and ESA's XMM-Newton observatories.]]
There are a number of types of object that consist of or contain a neutron star:
* Isolated neutron star (INS):<ref name="pavlov" /><ref name="cco" /><ref name="ins">{{cite book |arxiv=1008.2891 |date=April 2010 |first=Sandro |last=Mereghetti |title=High-Energy Emission from Pulsars and their Systems |volume=21 |pages=345–363 |doi=10.1007/978-3-642-17251-9_29 |chapter=X-ray emission from isolated neutron stars |series=Astrophysics and Space Science Proceedings |isbn=978-3-642-17250-2 |bibcode=2011ASSP...21..345M |s2cid=117102095 }}</ref><ref name="slac">{{cite journal |bibcode=2000IAUS..195..103P |title=Thermal Radiation from Isolated Neutron Stars |last1=Pavlov |first1=G. G. |last2=Zavlin |first2=V. E. |journal=Highly Energetic Physical Processes and Mechanisms for Emission from Astrophysical Plasmas |year=2000 |volume=195 |page=103 }}</ref> not in a binary system.
** [[Rotation-powered pulsar]] (RPP or "radio pulsar"):<ref name="cco" /> neutron stars that emit directed pulses of radiation towards us at regular intervals (due to their strong magnetic fields).
*** [[Rotating radio transient]] (RRATs):<ref name="cco" /> are thought to be pulsars which emit more sporadically and/or with higher pulse-to-pulse variability than the bulk of the known pulsars.
** [[Magnetar]]: a neutron star with an extremely strong magnetic field (1000 times more than a regular neutron star), and long rotation periods (5 to 12 seconds).
*** [[Soft gamma repeater]] (SGR).<ref name="pavlov" />
*** [[Anomalous X-ray pulsar]] (AXP).<ref name="pavlov" />
** [[Radio-quiet neutron star]]s.
*** X-ray dim isolated neutron stars.<ref name="cco" />
*** [[Central compact object]]s in [[supernova remnant]]s (CCOs in SNRs): young, radio-quiet non-pulsating X-ray sources, thought to be Isolated Neutron Stars surrounded by supernova remnants.<ref name="cco" />
* [[X-ray pulsar]]s or "accretion-powered pulsars": a class of [[X-ray binaries]].
** Low-mass X-ray binary pulsars: a class of [[low-mass X-ray binaries]] (LMXB), a pulsar with a main sequence star, white dwarf or red giant.
*** [[Millisecond pulsar]] (MSP) ("recycled pulsar").
**** "Spider Pulsar", a pulsar where their companion is a semi-degenerate star.<ref>{{cite journal |bibcode=2019ApJ...886..148P |title=Eight Millisecond Pulsars Discovered in the Arecibo PALFA Survey |last1=Parent |first1=E. |last2=Kaspi |first2=V. M. |last3=Ransom |first3=S. M. |last4=Freire |first4=P. C. C. |last5=Brazier |first5=A. |last6=Camilo |first6=F. |last7=Chatterjee |first7=S. |last8=Cordes |first8=J. M. |last9=Crawford |first9=F. |last10=Deneva |first10=J. S. |last11=Ferdman |first11=R. D. |last12=Hessels |first12=J. W. T. |last13=Van Leeuwen |first13=J. |last14=Lyne |first14=A. G. |last15=Madsen |first15=E. C. |last16=McLaughlin |first16=M. A. |last17=Patel |first17=C. |last18=Scholz |first18=P. |last19=Stairs |first19=I. H. |last20=Stappers |first20=B. W. |last21=Zhu |first21=W. W. |journal=The Astrophysical Journal |year=2019 |volume=886 |issue=2 |page=148 |doi=10.3847/1538-4357/ab4f85 |arxiv=1908.09926 |s2cid=201646167 |doi-access=free }}</ref>
***** "Black Widow" pulsar, a pulsar that falls under the "Spider Pulsar" if the companion has extremely low mass (less than {{solar mass|0.1}}).
***** "Redback" pulsar, are if the companion is more massive.
**** Sub-millisecond pulsar.<ref>{{cite journal |bibcode=1989PThPh..81.1006N |title=Binary Sub-Millisecond Pulsar and Rotating Core Collapse Model for SN1987A |first=T. |last=Nakamura |doi=10.1143/PTP.81.1006 |journal=Progress of Theoretical Physics |volume=81 |issue=5 |pages=1006–1020 |date=1989 |doi-access= }}</ref>
*** [[X-ray burster]]: a neutron star with a low mass binary companion from which matter is accreted resulting in irregular bursts of energy from the surface of the neutron star.
** Intermediate-mass X-ray binary pulsars: a class of [[intermediate-mass X-ray binaries]] (IMXB), a pulsar with an intermediate mass star.
** High-mass X-ray binary pulsars: a class of [[high-mass X-ray binaries]] (HMXB), a pulsar with a massive star.
** [[Binary pulsar]]s: a [[pulsar]] with a [[binary star|binary companion]], often a [[white dwarf]] or neutron star.
** X-ray tertiary (theorized).<ref>{{cite journal |bibcode=2020MNRAS.491..495D |title=The dynamical Roche lobe in hierarchical triples |last1=Di Stefano |first1=Rosanne |journal=Monthly Notices of the Royal Astronomical Society |year=2020 |volume=491 |issue=1 |page=495 |doi=10.1093/mnras/stz2572 |doi-access=free |arxiv=1903.11618 }}</ref>

There are also a number of theorized compact stars with similar properties that are not actually neutron stars.
* Protoneutron star (PNS),<ref>{{cite journal |bibcode=2001ApJ...562..887T |title=The Physics of Proto-Neutron Star Winds: Implications for r-Process Nucleosynthesis |last1=Thompson |first1=Todd A. |last2=Burrows |first2=Adam |last3=Meyer |first3=Bradley S. |journal=The Astrophysical Journal |year=2001 |volume=562 |issue=2 |page=887 |doi=10.1086/323861 |arxiv=astro-ph/0105004 |s2cid=117093903 }}</ref> a theorized intermediate–stage object that cools and contracts to form a neutron star or a black hole<ref>{{cite journal | last1=Gondek-Rosińska | first1=D. | last2=Haensel | first2=P. | last3=Zdunik | first3=J. L. | date=January 2000 | title=Protoneutron stars and neutron stars | series=ASP Conference Series | journal=Pulsar Astronomy - 2000 and Beyond; Proceedings of the 177th Colloquium of the IAU Held in Bonn, Germany, 30 August – 3 September 1999 | editor1-first=M. | editor1-last=Kramer | editor2-first=N. | editor2-last=Wex | editor3-first=N. | editor3-last=Wielebinski | volume=202 | pages=663–664 | publisher=Cambridge University Press | arxiv=astro-ph/0012543 | bibcode=2000ASPC..202..663G }}</ref>
* [[Exotic star]]
** [[Thorne–Żytkow object]]: currently a hypothetical merger of a neutron star into a red giant star.
** [[Quark star]]: currently a hypothetical type of neutron star composed of [[quark matter]], or [[strange matter]]. As of 2018, there are three candidates.
** [[Electroweak star]]: currently a hypothetical type of extremely heavy neutron star, in which the quarks are converted to leptons through the electroweak force, but the gravitational collapse of the neutron star is prevented by radiation pressure. As of 2018, there is no evidence for their existence.
** [[Preon star]]: currently a hypothetical type of neutron star composed of [[preon matter]]. As of 2018, there is no evidence for the existence of [[preon]]s.