tjmaccarone on 08-Jul-2026 18:15:02 GMT about 1A 0620-00
It has not been classified as an HXB in that paper. High mass X-ray binaries have high mass donor stars, not high mass accretors. The paper you link states that the donor in this system is a K dwarf, which makes the system a low mass X-ray binary.
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View annotation on 1A 0620-00 object