Spectral and type I X-ray burst studies of 4U 1702-429 using AstroSat observations

被引：2

作者：

Varun, M. ^{[1
]}

Thomas, Neal Titus ^{[1
]}

Gudennavar, S. B. ^{[1
]}

Bubbly, S. G. ^{[1
]}

机构：

[1] CHRIST Univ, Dept Phys & Elect, Bangalore 560029, Karnataka, India

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 529卷 / 03期

关键词：

accretion; accretion discs; stars: neutron; X-rays: binaries; X-rays: bursts; X-rays: individual: 4U 1702-429; NEUTRON-STARS; BLACK-HOLE; MASS; INSTRUMENT;

D O I：

10.1093/mnras/stae636

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

4U 1702-429, an atoll-type neutron star low-mass X-ray binary, was observed twice by the AstroSat/Soft X-ray Telescope (SXT) and Large Area X-ray Proportional Counters (LAXPC-20) on 2018 April 27 and 2019 August 8. Persistent emission spectra of the source were well fitted with the model combination - constant x tbabs (thcomp x diskbb+powerlaw). The parameters obtained from the spectral analysis revealed the source to be in a hard spectral state during the observations. Time-resolved spectral analyses were performed on the three type I X-ray bursts detected from the source. Burst analysis showed that the source underwent a photospheric radius expansion. Consequently, the radius of the neutron star and distance to the source (with isotropic and anisotropic burst emission) were obtained as 12.65(-0.86)(+0.90) km and 6.92(-0.09)(+0.16) and 8.43(-0.10 )(+0.20)kpc, respectively.

引用

页码：2234 / 2241

页数：8

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