The observations found that J085039 is a HMXB consisting of a neutron star and a red supergiant companion of spectral type M2 ...

Based on the mass of the companion star, astronomers divide them into low-mass X-ray binaries (LMXB) and high-mass X-ray binaries (HMXB). Be/X-ray binaries (BeXRBs) are the largest subgroup of HMXBs.

An X-Ray binary with a Neutron Star as the compact object can be classified either as a High-mass X-Ray binary (HMXB) (M >10M☉) or a Low-mass X-Ray binary (LMXB) (M < 2M☉), depending on the mass of ...