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A high-mass X-ray binary (HMXB) is a binary star system that is strong in X rays, and in which the normal stellar component is a massive star: usually an O or B star, a blue supergiant, or in some cases, a red supergiant or a Wolf–Rayet star. The compact, X-ray emitting, component is a neutron star or black hole. [1]
X-ray binary; A. AM Canum Venaticorum star; B. Beta Lyrae variable; C. Cataclysmic variable star; X. X-ray burster This page was last edited on 4 October 2010, at 06: ...
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Her X-1 is the prototype for the massive X-ray binaries although it falls on the borderline, ~2 M ☉, between high- and low-mass X-ray binaries. [2] An intermediate-mass X-ray binary (IMXB) is a binary star system where one of the components is a neutron star or a black hole. The other component is an intermediate mass star. [3]
Vela X-1 is a pulsing, eclipsing high-mass X-ray binary (HMXB) system, associated with the Uhuru source 4U 0900-40 and the supergiant star HD 77581. The X-ray emission of the neutron star is caused by the capture and accretion of matter from the stellar wind of the supergiant companion. Vela X-1 is the prototypical detached HMXB. [4]
Swift J010902.6-723710 is a Be/X-ray binary system detected by the Swift Small Magellanic Cloud (SMC) Survey (S-CUBED). An X-ray outburst, detected on October 10, 2023, had characteristics of Type I and II outbursts. Proposed orbital period is 60.623 days. Companion star of the system is "B0-0.5 star of spectral class Ve".
Holmberg II X-1: This famous ULX resides in a dwarf galaxy. Multiple observations with XMM have revealed the source in both a low/hard and high/soft state, suggesting that this source could be a scaled-up X-ray binary or accreting IMBH. M74: Possibly containing an intermediate-mass black hole, as observed by Chandra in 2005.
The source is one of the ten brightest persistent X-ray sources in the 10-100 keV hard X-ray energy region. Evidence of Compton cooling during an X-ray flare recorded by the Chandra X-ray telescope strongly suggests that the compact object is a neutron star; [ 13 ] if verified it would be among the most massive known , and near the boundary of ...