Difference Frequency of Kilohertz QPOs Not Equal to Half the Burst Oscillation Frequency in 4U 1636−53 | Zendy

Mariano Méndez | Zendy; M. van der Klis | Zendy; J. van Paradijs | Zendy

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Difference Frequency of Kilohertz QPOs Not Equal to Half the Burst Oscillation Frequency in 4U 1636−53

Author(s) -

Mariano Méndez,

M. van der Klis,

J. van Paradijs

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311650

Subject(s) - physics , oscillation (cell signaling) , astrophysics , beat (acoustics) , binary number , quasi periodic , low frequency , optics , astronomy , mathematics , genetics , arithmetic , biology

We have analyzed data obtained during two observations with the Rossi X-rayTiming Explorer on January 5 and 8, 1997, of the low-mass X-ray binary (LMXB)and atoll source 4U 1636-53. We measure the frequency separation of the twosimultaneous kilohertz quasi-periodic oscillations (kHz QPOs) in this source tobe 253.7 +/- 4.7 and 246.4 +/- 5.4 Hz, respectively. These values areinconsistent with being equal to 0.5 times the frequency of the 581-Hzoscillations that have been detected previously in 4U 1636-53 during type Ibursts. The weighted average discrepancy is 39.5 +/- 3.5 Hz. This result showsthat a simple beat-frequency interpretation of the kHz QPOs, in which thefrequency of the oscillations detected during type I bursts equals theseparation between the two kHz QPOs (or twice that value), is incorrect.Comment: Accepted for publication in The Astrophysical Journal Letters. 4 pages plus 1 postscript figur

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