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The distance to 4XMM J182531.5-144036 is estimated to be about 3300 to 23,000 light years, but the exact value is not yet known. It has an orbital period of 250 to 500 days.
Be-stars are very hot stars of spectral class B (white-blue) with an effective temperature of 10,000 to 30,000 kelvin with luminosity of class III to V (i.e., not supergiants), whose spectrum is characterised by at least one emission line of emission – usually a Balmer series of hydrogen.
