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Recent timing studies on RXTE observations of 4U 1538-52
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Date
2006-07-01
Author
Baykal, Altan
Beklen, E.
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The high mass X-ray binary pulsar 4U 1538-52 was observed between July 31 and August 7, 2003. Using these observations, we determined new orbital epochs for both circular and elliptical orbit models. The orbital epochs for both orbit solutions agreed with each other and yielded an orbital period derivative. P/P = (0.4 +/- 1.8) x 10(-6) yr(-1). This value is consistent with the earlier measurement P/P = (2.9 +/- 2.1) x 10(-6) yr(-1) at the 1 sigma level and gives only an upper limit to the orbital period decay. Our determination of the pulse frequency showed that the source spun up at an average rate of 2.76 x 10(-1)4 Hz s(-1) between 1991 and 2003.
Subject Keywords
Space and Planetary Science
,
Astronomy and Astrophysics
URI
https://hdl.handle.net/11511/38939
Journal
ASTRONOMY & ASTROPHYSICS
DOI
https://doi.org/10.1051/0004-6361:20054616
Collections
Department of Physics, Article
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A. Baykal and E. Beklen, “Recent timing studies on RXTE observations of 4U 1538-52,”
ASTRONOMY & ASTROPHYSICS
, pp. 1037–1040, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38939.