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.
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页数：6
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