Yuh-Shan Chou

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We present timing analysis results for Rossi x-ray Timing Explorer (RXTE) observations of x-ray binary source 4U 1820−30 located in the globular cluster NGC 6624. The light curves of observations made between October 1996 and September 1997 show that the maximum of the 685s binary period modulation folded by the linear ephemeris from previous observations(More)
We report the EXITE2 hard X-ray imaging of the sky around 3C273. A 2h observation on May 8, 1997, shows a ∼260 mCrab source detected at ∼4σ in each of two bands (50-70 and 70-93 keV) and located ∼30’ from 3C273 and consistent in position with the SIGMA source GRS1227+025. The EXITE2 spectrum is consistent with a power law with photon index 3 and large low(More)
Liriodendron is a genus of two species of characteristically large deciduous trees in the magnolia family (Magnoliaceae). Two species of Liriodendron are known to exist. Liriodendron tulipifera is native to eastern North America, while L. chinense is native to China and Vietnam. Both species often grow to great size, sometimes exceeding 32 m or 100 feet in(More)
This study reports pulse variation analysis results for the forth discovered accretion-powered millisecond pulsar XTE J1807-294 during its 2003 outburst observed by Rossi X-ray Timing Explorer. The pulsation is significantly detected only in the first ∼90d out of ∼150d observations. The pulse phase variation is too complex to be described as an orbital(More)
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