期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 67, 期 4, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psv039
关键词
pulsars: individual (GX 304-1); stars: neutron; X-rays: binaries
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [24340041, 25400239]
A report is made on the luminosity and pulse period evolution of the Be binary X-ray pulsar GX304-1 during a series of outbursts from 2009 to 2013 observed by MAXI/GSC, RXTE/PCA, and Fermi/GBM. In total, 12 outbursts repeated by similar to 132.2 d were observed, which is consistent with the X-ray periodicity of this object observed in the 1970s. These 12 outbursts, together with those in the 1970s, were all found to recur with a well-defined period of 132.189 +/- 0.02 d, which can be identified with the orbital period. The pulse period of similar to 275 s, obtained from the RXTE/PCA and Fermi/GBM data, apparently exhibited a periodic modulation synchronized with the outburst period, suggesting the pulsar orbital motion, which is superposed on a secular spin-up trend throughout the entire active phase. The observed pulse period changes were successfully represented by a model composed of the binary orbital modulation and pulsar spin up caused by mass accretion through an accretion disk. The orbital elements obtained from the best-fit model, including the projected orbital semi-major axis a(x) sin i similar or equal to 500-600 light-s and an eccentricity e similar or equal to 0.5, are typical of Be binary X-ray pulsars.
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