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Short term pulse frequency fluctuations of OAO 1657-415 from RXTE observations

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Altan Baykal (Middle East Technical University, Physics Department)

Astrophysics · Submitted 21 Apr 2000

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim The marginal correlation between the gradual spin-up (or decrease in spin-down rate) and increase in X-ray luminosity suggests that the OAO 1657-415 is observed during a stable accretion episode where the prograde accretion disk is formed.

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arXiv IDastro-ph/0004316 (version 1)
Pith IDFCKYSSVS, Pith's permanent record of this paper and its review
CitationAltan Baykal (Middle East Technical University, Physics Department). "Short term pulse frequency fluctuations of OAO 1657-415 from RXTE observations." arXiv:astro-ph/0004316 (2000). https://pith.science/paper/FCKYSSVS
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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,151 input tokens.

What the abstract itself states, as probabilities: claims first 0.89 · states limitation 0.18 · human participants 0.01 · controlled comparison 0.06 · randomized assignment 0.01 · states quantitative result 0.71 · compares with prior results 0.94 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

We present new X-ray observations of the high mass X-ray binary (HMXRB) pulsar OAO 1657-415, obtained during one orbital period (10.44 days) with the Rossi X-Ray Timing Explorer (RXTE). Using the binary orbital parameters, obtained from Burst and Transient Source Experiment (BATSE) observations, we resolve the fluctuations in the pulse frequency at time scales on the order of one day for the first time. Recent BATSE results showed that OAO 1657-415 has spin-up/down trends in its pulse frequency time series, without any correlation with the X-luminosity at energies $>$20 keV (Baykal 1997). In the present RXTE observations the source is found to be in an extended phase of spin-down. We also find a gradual increase in the X-ray luminosity which is correlated with a marginal spin-up episode. The marginal correlation between the gradual spin-up (or decrease in spin-down rate) and increase in X-ray luminosity suggests that the OAO 1657-415 is observed during a stable accretion episode where the prograde accretion disk is formed.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 We present new X-ray observations of the high mass X-ray binary (HMXRB) pulsar OAO 1657-415, obtained during one orbital period (10.44 days) with the Rossi X-Ray Timing Explorer (RXTE). contribution 0.61 0.96 0.03 asserted 0.99
s1 Using the binary orbital parameters, obtained from Burst and Transient Source Experiment (BATSE) observations, we resolve the fluctuations in the pulse frequency at time scales on the order of one day for the first time. contribution 0.64 0.93 0.12 asserted 1.00
s2 Recent BATSE results showed that OAO 1657-415 has spin-up/down trends in its pulse frequency time series, without any correlation with the X-luminosity at energies $>$20 keV (Baykal 1997). background 1.00 0.04 0.04 asserted 1.00
s3 In the present RXTE observations the source is found to be in an extended phase of spin-down. result 1.00 0.96 0.12 asserted 1.00
s4 We also find a gradual increase in the X-ray luminosity which is correlated with a marginal spin-up episode. result 1.00 0.97 0.12 asserted 1.00
s5 The marginal correlation between the gradual spin-up (or decrease in spin-down rate) and increase in X-ray luminosity suggests that the OAO 1657-415 is observed during a stable accretion episode where the prograde accretion disk is formed. interpretation 1.00 0.81 0.73 hedged possibility 0.96

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.98.

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Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

We present new X-ray observations of the high mass X-ray binary (HMXRB) pulsar OAO 1657-415, obtained during one orbital period (10.44 days) with the Rossi X-Ray Timing Explorer (RXTE). Using the binary orbital parameters, obtained from Burst and Transient Source Experiment (BATSE) observations, we resolve the fluctuations in the pulse frequency at time scales on the order of one day for the first time. Recent BATSE results showed that OAO 1657-415 has spin-up/down trends in its pulse frequency time series, without any correlation with the X-luminosity at energies $>$20 keV (Baykal 1997). In the present RXTE observations the source is found to be in an extended phase of spin-down. We also find a gradual increase in the X-ray luminosity which is correlated with a marginal spin-up episode. The marginal correlation between the gradual spin-up (or decrease in spin-down rate) and increase in X-ray luminosity suggests that the OAO 1657-415 is observed during a stable accretion episode where the prograde accretion disk is formed.

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