Discovery of a 437.5-s X-ray pulsation from 4U 1907+09.
Abstract
Observation of an X-ray pulsation with a period of 437.5 seconds from the X-ray source 4U 1907 + 09 is reported. The observations were carried out using the gas scintillation proportional counter (GSPC) array of the Tenma X-ray astronomy satellite. Analysis of the pulse-arrival time showed that the 8.38-d periodic X-ray modulation observed by Ariel 5 in 4U 1907 + 09 can be regarded as a binary period. An X-ray mass function f(M) of about 9 solar mass was derived, confirming that the optical counterpart of 4U 1907 + 09 is massive. On the basis of the observational results, it is demonstrated that 4U 1907 + 09 is an X-ray pulsar.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- 1984
- Bibcode:
- 1984PASJ...36..679M
- Keywords:
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- B Stars;
- Pulsars;
- X Ray Binaries;
- Astronomical Satellites;
- Orbital Elements;
- Pulse Rate;
- Radiant Flux Density;
- Stellar Mass;
- Stellar Models;
- Time Series Analysis;
- X Ray Spectra;
- Astronomy;
- X-Ray Binaries:X-Ray Pulsars;
- X-Ray Pulsars:X-Ray Binaries