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VELA X-1 pulse timing. I - Determination of the neutron star orbit

1986; IOP Publishing; Volume: 307; Linguagem: Inglês

10.1086/164443

1538-4357

P. E. Boynton, J. E. Deeter, F. K. Lamb, G. Zylstra,

Astro and Planetary Science

view Abstract Citations (34) References (41) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS VELA X-1 Pulse Timing. I. Determination of the Neutron Star Orbit Boynton, P. E. ; Deeter, J. E. ; Lamb, F. K. ; Zylstra, G. Abstract Analysis and interpretation of observations of the pulsed X-ray emission from Vela X-1 are presented. The interrelated tasks of determining the neutron-star orbit and calculating pulse emission times in the rest frame of the source are considered, with the underlying motivation to utilize this time series for analysis of fluctuations in the pulse emission frequency, which are interpreted as noise in the neutron-star rotation rate. However, the redness and strength of this noise in Vela X-1 pose a nontrivial complication, because the parameters of the neutron-star orbit are estimated by pulse timing and hence are themselves affected by fluctuations in the pulse emission frequency. A second challenge is presented by substantial fluctuations in the Vela X-1 pulse shape that, if ignored, would significantly reduce both the precision of the orbital solution and the ability to study fluctuations in the rotation rate. The report emphasizes the analysis techniques that have been developed to obtain the most precise orbital solution possible in the face of these difficulties. These techniques are general and may be applied to other pulsars that exhibit substantial fluctuations in pulse shape and frequency, such as Her X-1 and Cen X-3. Publication: The Astrophysical Journal Pub Date: August 1986 DOI: 10.1086/164443 Bibcode: 1986ApJ...307..545B Keywords: Neutron Stars; Pulsars; Stellar Motions; X Ray Binaries; Error Analysis; Heao 1; Orbit Calculation; Oso-8; Polynomials; Time Series Analysis; Astrophysics; PULSARS; STARS: INDIVIDUAL CONSTELLATION NAME: VELA X-1; STARS: NEUTRON; X-RAYS: BINARIES full text sources ADS | data products SIMBAD (3) Related Materials (1) Part 2: 1989ApJ...336..376D