Abstract
An outburst of the transient X-ray pulsar X0115 + 634 was detected with the All Sky Monitor (ASM) on board Ginga on February 5, 1990. Follow-up observations with the large-area proportional counters (LACs) revealed complex changes in the energy spectrum which depend on the phase of the 3.6 s pulsation. Characteristic structures in the spectra above 10 keV can be best interpreted as two dips at about 12 and about 23 keV, although not at all phases. The results strongly suggest that the structures in the spectra are due to cyclotron resonant scattering and the two apparent absorption lines are ascribed to the fundamental and second harmonics. This indicates a magnetic field strength on the neutron star surface of about 1 {times} 10 to the 12th G. Equivalent widths of the second harmonic line are about 2 times larger than those of the first harmonic line, depending on the pulse phase. 25 refs.
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