An Application of Hilbert-Huang Transform on the Non-Stationary Astronomical Time Series: The Superorbital Modulation of SMC X-1

Journal of Astronomy and Space Sciences

Yi Chou¹  Chin-Ping Hu¹  Yi-Hao Su¹  Ting-Chang Yang¹  Ming-Chya Wu² 

[1] Graduate Institute of Astronomy, National Central University, Jhongli 32001, Taiwan;Research Center for Adaptive Data Analysis, National Central University, Jhongli 32001, Taiwan;

关键词: X-ray binaries;    superorbital modulations;    Hilbert-Huang transform;    SMC X-1 1. INTRODUCTION The high-mass X-ray binary SMC X-1 consists of a 1.06 M⊙ neutron star (van der Meer et al. 2007) and a 17.2 M⊙ supergiant (Reynolds et al. 1993). The orbital period of this system is ~3.89 d obtained from the X-ray eclipse. Gruber & Rothschild (1984) found that the SMC X-1 exhibits an X-ray periodicity with a rough time scale of 60 d. This periodicity was then confirmed by Wojdowski et al. (1998) and the cycle lengths were reported to vary with time. The behavior of the period variation was investigated after several timefrequency analysis techniques;    like the dynamic power spectrum (Clarkson et al. 2003) and the slide Lomb-Scargle periodogram (Trowbridge et al. 2007);    were applied on the All-Sky Monitor (ASM) light curve. We present our analysis by;    SMC X-1;   

DOI  :  10.5140/JASS.2013.30.2.079

来源: DOAJ

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