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

We present the Hilbert-Huang transform (HHT) analysis on the quasi-periodic modulation of SMC X-1. SMC X-1, consisting of a neutron star and a massive companion, exhibits superorbital modulation with a period varying between ~40 d and ~65 d. We applied the HHT on the light curve observed by the Al...

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Bibliographic Details
Main Authors:	Chin-Ping Hu, Yi Chou, Ming-Chya Wu, Ting-Chang Yang, Yi-Hao Su
Format:	Article
Language:	English
Published:	Korean Space Science Society (KSSS) 2013-06-01
Series:	Journal of Astronomy and Space Sciences
Subjects:	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
Online Access:	http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n2/OJOOBS_2013_v30n2_79.pdf

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http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n2/OJOOBS_2013_v30n2_79.pdf

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

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