Optical Modulation in the X-Ray Binary 4U 1543-624 Revisited

被引：2

作者：

Wang, Z. ^{[1
]}

Tziamtzis, A. ^{[1
]}

Kaplan, D. L. ^{[2
]}

Chakrabarty, D. ^{[3
]}

机构：

[1] Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China

[2] Univ Wisconsin Milwaukee, Dept Phys, Milwaukee, WI 53211 USA

[3] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA | 2015年 / 32卷

基金：

中国国家自然科学基金;

关键词：

binaries: close; stars: individual (4U 1543-624); stars: low-mass; stars: neutron; X-rays: binaries; LOW-MASS; PERIODIC MODULATION; SAX J1808.4-3658; ACCRETION DISCS; ORBITAL PERIOD; EVOLUTION; SYSTEMS; 4U-1543-624; ULTRAVIOLET; RADIATION;

D O I：

10.1017/pasa.2015.36

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The X-ray binary 4U 1543-624 has been provisionally identified as an ultra-compact system with an orbital period of similar or equal to 18 min. We have carried out time-resolved optical imaging of the binary to verify the ultra-short orbital period. Using 140 min of high-cadence r '-band photometry, we recover the previously-seen sinusoidal modulation and determine a period P = 18.20 +/- 0.09 min. In addition, we also see a 7.0x10(-4) mag min(-1) linear decay, likely related to variations in the source's accretion activity. Assuming that the sinusoidal modulation arises from X-ray heating of the inner face of the companion star, we estimate a distance of 6.0-6.7 kpc and an inclination angle of 34 degrees-61 degrees (90% confidence) for the binary. Given the stability of the modulation, we can confirm that the modulation is orbital in origin and 4U 1543-624 is an ultra-compact X-ray binary.

引用

页数：6

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