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Title: ORBITAL DECAY AND EVIDENCE OF DISK FORMATION IN THE X-RAY BINARY PULSAR OAO 1657-415

Abstract

OAO 1657-415 is an eclipsing X-ray binary wind-fed pulsar that has exhibited smooth spin-up/spin-down episodes and has undergone several torque reversals throughout its long history of observation. We present a frequency history spanning nearly 19 years of observations from the Burst and Transient Source Experiment and from the Gamma-Ray Burst Monitor (Fermi/GBM). Our analysis suggests two modes of accretion: one resulting in steady spin-up correlated with flux during which we believe a stable accretion disk is present and one in which the neutron star is spinning down at a lesser rate which is uncorrelated with flux. Orbital elements of the pulsar system are determined at several intervals throughout this history. With these ephemerides, statistically significant orbital decay with a P-dot {sub orb}=(-9.74{+-}0.78) Multiplication-Sign 10{sup -8} is established.

Authors:
 [1];  [2];  [3];  [4]
  1. MSFC/NPP, Huntsville, AL 35812 (United States)
  2. Universities Space Research Association, Huntsville, AL 35806 (United States)
  3. Space Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL 35812 (United States)
  4. Institut de Ciencies de l'Espai (CSIC-IEEC), Campus UAB, Facultat de Ciencies, Torre C5-parell, E-08193, Barcelona (Spain)
Publication Date:
OSTI Identifier:
22086359
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; ASTRONOMY; ASTROPHYSICS; BINARY STARS; COSMIC GAMMA BURSTS; DECAY; NEUTRON STARS; PULSARS; SPIN; STAR ACCRETION; STELLAR WINDS; TORQUE; TRANSIENTS; X RADIATION

Citation Formats

Jenke, P. A., Finger, M. H., Wilson-Hodge, C. A., and Camero-Arranz, A. ORBITAL DECAY AND EVIDENCE OF DISK FORMATION IN THE X-RAY BINARY PULSAR OAO 1657-415. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/2/124.
Jenke, P. A., Finger, M. H., Wilson-Hodge, C. A., & Camero-Arranz, A. ORBITAL DECAY AND EVIDENCE OF DISK FORMATION IN THE X-RAY BINARY PULSAR OAO 1657-415. United States. doi:10.1088/0004-637X/759/2/124.
Jenke, P. A., Finger, M. H., Wilson-Hodge, C. A., and Camero-Arranz, A. Sat . "ORBITAL DECAY AND EVIDENCE OF DISK FORMATION IN THE X-RAY BINARY PULSAR OAO 1657-415". United States. doi:10.1088/0004-637X/759/2/124.
@article{osti_22086359,
title = {ORBITAL DECAY AND EVIDENCE OF DISK FORMATION IN THE X-RAY BINARY PULSAR OAO 1657-415},
author = {Jenke, P. A. and Finger, M. H. and Wilson-Hodge, C. A. and Camero-Arranz, A.},
abstractNote = {OAO 1657-415 is an eclipsing X-ray binary wind-fed pulsar that has exhibited smooth spin-up/spin-down episodes and has undergone several torque reversals throughout its long history of observation. We present a frequency history spanning nearly 19 years of observations from the Burst and Transient Source Experiment and from the Gamma-Ray Burst Monitor (Fermi/GBM). Our analysis suggests two modes of accretion: one resulting in steady spin-up correlated with flux during which we believe a stable accretion disk is present and one in which the neutron star is spinning down at a lesser rate which is uncorrelated with flux. Orbital elements of the pulsar system are determined at several intervals throughout this history. With these ephemerides, statistically significant orbital decay with a P-dot {sub orb}=(-9.74{+-}0.78) Multiplication-Sign 10{sup -8} is established.},
doi = {10.1088/0004-637X/759/2/124},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}