Query : 2013A&A...559A.129J

2013A&A...559A.129J - Astronomy and Astrophysics, volume 559A, 129-129 (2013/11-1)

Prediction of the radio outbursts of LS I + 61°303.


Abstract (from CDS):

In the gamma-ray binary LS I +61°303, radio outbursts occur every 26.70 days and are modulated by a long-term periodicity of 1667 days. Until now the prediction of the periodical radio outbursts has been made using the orbital period P1=26.4960±0.0028-days. This procedure implies timing residuals up to ∼7 days affected by a systematic error with a sawtooth pattern. On the other hand, the direct use of the known periodicity of the radio outbursts, that is of Poutburst= P_average=26.70±0.05d, is prevented because of a time variable phase term. Our aim is to analyze this phase term and determine its exact value at each given epoch. First, we modeled the systematic sawtooth pattern affecting the timing residuals between the observed outbursts and those predicted by P1. Then, we removed this pattern from 6.7yr of 8.3GHz Green Bank Inferferometer radio data to generate noise-limited residuals. Finally, we determined a criterion to determine the phase term based on the number of elapsed cycles of the long-term modulation at a given epoch. The prediction of the outburst with P=Paverage is now straightforward and produces noise-limited timing residuals.

Abstract Copyright:

Journal keyword(s): radio continuum: stars - X-rays: binaries - X-rays: individuals: LS I +61 303 - gamma rays: stars

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 822 2
2 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1825 1

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