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X-ray Transients
A large fraction of the MXRBs (massive X-ray binaries) which are seen to
be transients have a Be star as the normal companion. Be stars were
intensively studied in the 1930s by Otto Struve. The "e" stands for
emission lines, which are seen to be present in their spectra with
variable intensity over a wide range of timescales (hours to
years).
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