RX J0720.4-3125

RX J0720.4-3125
	The location of RX J0720.4-3125 (circled in red)
Observation data; Epoch 1996.7 Equinox J2000.0
Constellation	Canis Major
Right ascension	07h 20m 24.961s
Declination	−31° 25′ 50.21″
Apparent magnitude (V)	~26.6
Details
Radius	4.50+0.08; −0.09 – 5.38+0.13; −0.14 km
Other designations
	RX J0720.4−3125, 1ES 0718−31.3
Database references
SIMBAD	data

RX J0720.4−3125 is a neutron star in the constellation Canis Major. It was discovered in 1997 in the ROSAT survey.^[1] It is around 360 parsecs (1,200 light-years) from Earth.^[3] It is a member of the Magnificent Seven, a group of neutron stars that are relatively near to the Solar System. RX J0720.4–3125 has a radius of around 5 km. Its temperature and color has been changing strangely over several years. It is hard to know why these changes are happening, but it could be that there was something happening, like the star absorbing an accretion disc.^[2]

References

↑ ^1.0 ^1.1 Kaplan, D.L.; van Kerkwijk, M.H.; Marshall, H.L.; Jacoby, B.A.; Kulkarni, S. R.; Frail, D.A. (2003). "The Nearby Neutron Star RX J0720.4-3125 from Radio to X-rays". The Astrophysical Journal. 590 (2): 1008–1019. arXiv:astro-ph/0303126. Bibcode:2003ApJ...590.1008K. doi:10.1086/375052. S2CID 17115753.
↑ ^2.0 ^2.1 Hohle, M.M.; Haberl, F.; Vink, J.; de Vries, C.P.; et al. (2012). "The Continued Spectral and Temporal Evolution of RX J0720.4-3125". Monthly Notices of the Royal Astronomical Society. 423 (2): 1194–99. arXiv:1203.3708. Bibcode:2012MNRAS.423.1194H. doi:10.1111/j.1365-2966.2012.20946.x. S2CID 55696761.{{cite journal}}: CS1 maint: unflagged free DOI (link)
↑ Kaplan, D. L.; van Kerkwijk, M. H.; Anderson, J. (2007). "The Distance to the Isolated Neutron Star RX J0720.4-3125". The Astrophysical Journal. 660 (2): 1428–43. arXiv:astro-ph/0703343. Bibcode:2007ApJ...660.1428K. doi:10.1086/513309. S2CID 18223428.

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[Kaplan1-1] 1.0 ^1.1 Kaplan, D.L.; van Kerkwijk, M.H.; Marshall, H.L.; Jacoby, B.A.; Kulkarni, S. R.; Frail, D.A. (2003). "The Nearby Neutron Star RX J0720.4-3125 from Radio to X-rays". The Astrophysical Journal. 590 (2): 1008–1019. arXiv:astro-ph/0303126. Bibcode:2003ApJ...590.1008K. doi:10.1086/375052. S2CID 17115753.

[Hohle-2] 2.0 ^2.1 Hohle, M.M.; Haberl, F.; Vink, J.; de Vries, C.P.; et al. (2012). "The Continued Spectral and Temporal Evolution of RX J0720.4-3125". Monthly Notices of the Royal Astronomical Society. 423 (2): 1194–99. arXiv:1203.3708. Bibcode:2012MNRAS.423.1194H. doi:10.1111/j.1365-2966.2012.20946.x. S2CID 55696761.{{cite journal}}: CS1 maint: unflagged free DOI (link)

[Kaplan2-3] Kaplan, D. L.; van Kerkwijk, M. H.; Anderson, J. (2007). "The Distance to the Isolated Neutron Star RX J0720.4-3125". The Astrophysical Journal. 660 (2): 1428–43. arXiv:astro-ph/0703343. Bibcode:2007ApJ...660.1428K. doi:10.1086/513309. S2CID 18223428.

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