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Exploring accretion theory with X-ray binaries in the SMC

Exploring accretion theory with X-ray binaries in the SMC. M. J. Coe, V. A. McBride & R. H. D. Corbet arXiv:0908.4332v1. Introduction and background. Observations. 24 objects. Observations. SXP59.0. Observations. Pdot=kP 2 Four spin-down systems: SXP8.80,SXP59.0,SXP144& SXP1323 Lx

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Exploring accretion theory with X-ray binaries in the SMC

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  1. Exploring accretion theory with X-ray binaries in the SMC M. J. Coe, V. A. McBride & R. H. D. Corbet arXiv:0908.4332v1

  2. Introduction and background

  3. Observations 24 objects

  4. Observations SXP59.0

  5. Observations • Pdot=kP2 • Four spin-down systems: SXP8.80,SXP59.0,SXP144& SXP1323 • Lx • 1 RXTE count/pcu/s=0.4×1037 erg/s • 60kpc±10kpc to the SMC • Lx=0.4×1037×3R erg/s • R=RXTE counts/pcu/s

  6. Length of each observation:10-15ks Short period:0.5s

  7. SXP2.37 is excluded, Type Ⅱ outburst

  8. Discussion-reverse torques

  9. Spin period evolution Short P: 1-2 months Long P: ~10 years Long Pdot=0.2×short Pdot “kick”

  10. Neutron star masses Average mass: 1.3~1.9M⊙ 1.62±0.29M⊙

  11. Thank you!

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