Evolution of spin and superorbital modulation in 4U 0114+650

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101786

Title:	Evolution of spin and superorbital modulation in 4U 0114+650
Authors:	周翊;Hu, Chin-Ping;Ng, Chi-Yung;Chou, Yi
Contributors:	理學院天文研究所
Keywords:	4U 0114+650;accretion;accretion disks;X-ray binaries;천문학
Date:	2016-01-01
Issue Date:	2026-04-21 14:44:48 (UTC+8)
Publisher:	The Korean Space Science Society;한국우주과학회
Abstract:	摘要： We report on a systematic analysis of the spin and superorbital modulations of the high-mass X-ray binary 4U 0114+650, which consists of the slowest spinning neutron star known. Utilizing dynamic power spectra, we found that the spin period varied dramatically during the RXTE ASM and Swift BAT observations. This variation consists of a long-term spin-up trend, and two ~1,000 day and one ~600 day random walk epochs previously, MJD 51,000, ~MJD 51,400-52,000, and ~MJD 55,100-56,100. We further found that the events appear together with depressions of superorbital modulation amplitude. This provides evidence of the existence of an accretion disk, although the physical mechanism of superorbital modulation remains unclear. Furthermore, the decrease of the superorbital modulation amplitude may be associated with the decrease of mass accretion rate from the disk, and may distribute the accretion torque of the neutron star randomly in time. 出版者： 한국우주과학회 出版日期： 2016-09-01 出處： Journal of Astronomy and Space Sciences, 2016, 33(3), , pp.173-176 資源來源： DOAJ Directory of Open Access Journals 識別號： ISSN: 2093-5587 識別號： ISSN: 2093-1409 識別號： EISSN: 2093-1409 識別號： DOI: 10.5140/JASS.2016.33.3.173
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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