Browsing by Author "Kaaret, P."

Now showing items 1-6 of 6

    • Anticorrelated Hard/Soft X-Ray Emission from the X-Ray Burster 4U 0614+091 

      Ford, E.; Kaaret, P.; Tavani, M.; Harmon, B. A.; Zhang, S. N.; Barret, D.; Grindlay, J.; Bloser, P.; Remillard, R. A. (American Astronomical Society, 1996)
      We have detected transient X-ray activity from the X-ray burster 4U 0614+091 simultaneously with BATSE on board the Compton Gamma Ray Observatory (20-100 keV) and the all-sky monitor (ASM) on board the Rossi X-Ray Timing ...

    • Energy Spectra and High-Frequency Oscillations in 4U 0614+091 

      Ford, E. C.; Kaaret, P.; Chen, K.; Tavani, M.; Barret, D.; Bloser, P.; Grindlay, J.; Harmon, B. A.; Paciesas, W. S.; Zhang, S. N. (American Astronomical Society, 1997)
      We investigate the behavior of the high-frequency quasi-periodic oscillations (QPOs) in 4U 0614+091, combining timing and spectral analyses of RXTE observations. The energy spectra of the source can be described by a power ...

    • Evidence from Quasi-periodic Oscillations for a Millisecond Pulsar in the Low-Mass X-Ray Binary 4U 0614+091 

      Ford, E.; Kaaret, P.; Tavani, M.; Barret, D.; Bloser, P.; Grindlay, J.; Harmon, B. A.; Paciesas, W. S.; Zhang, S. N. (American Astronomical Society, 1997)
      We have detected quasi-periodic oscillations (QPOs) near 1 kHz from the low-mass X-ray binary 4U 0614+091 in observations with the Rossi X-Ray Timing Explorer. The observations span several months and sample the source ...

    • kHz Quasi-periodic Oscillation in Island State of 4U 1608–52 as Observed with RXTE/PCA 

      Yu, W.; Zhang, S. N.; Harmon, B. A.; Paciesas, W. S.; Robinson, C. R.; Grindlay, J. E.; Bloser, P.; Barret, D.; Ford, E. C.; Tavani, M.; Kaaret, P. (American Astronomical Society, 1997)
      We report RXTE/PCA observations of 4U 1608-52 on March 15, 18, and 22 immediately after the outburst in early 1996. The persistent count rates ranged from 190 to 450 counts s(-1) (1-60 keV). During this period of time, 4U ...

    • RXTE Studies of Long‐Term X‐Ray Spectral Variations in 4U 1820−30 

      Bloser, P. F.; Grindlay, J. E.; Kaaret, P.; Zhang, W.; Smale, A. P.; Barret, D. (American Astronomical Society, 2000)
      We present the results of detailed spectral studies of the ultracompact low mass X-ray binary (LMXB) 4U 1820-30 carried out with the Rossi X-ray Timing Explorer (RXTE) during 1996-1997. 4U 1820-30 is an "atoll" source X-ray ...

    • Strong-Field Gravity and X-Ray Observations of 4U 1820−30 

      Kaaret, P.; Piraino, S.; Bloser, P. F.; Ford, E. C.; Grindlay, J. E.; Santangelo, A.; Smale, A. P.; Zhang, W. (American Astronomical Society, 1999)
      The behavior of quasi-periodic oscillations (QPOs) at frequencies near 1 kHz in the X-ray emission from the neutron star X-ray binary 4U 1820-30 has been interpreted as evidence for the existence of the marginally stable ...