Return of 4U~1730--22 after 49 years silence: the peculiar burst properties of the 2021/2022 outbursts observed by Insight-HXMT

• Published in: arXiv.org
• Main Authors: Yu-Peng, Chen, Zhang, Shu, Long, Ji, Zhang, Shuang-Nan, Ling-Da Kong, Peng-Ju, Wang, Chang, Zhi, Jing-Qiang, Peng, Li, Jian, Jin-Lu, Qu, Zhao-Sheng, Li, Lian Tao, Ming-Yu, Ge
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 22.09.2022
• Subjects: Bursts; Deposition; Luminosity; Neutron stars; Neutrons; Occlusion; Outbursts; Photosphere; Physics - High Energy Astrophysical Phenomena; Physics - High Energy Physics - Phenomenology

After in quiescence for 49 years, 4U~1730--22 became active and had two outbursts in 2021 \& 2022; ten thermonuclear X-ray bursts were detected with Insight-HXMT. Among them, the faintest burst showed a double-peaked profile, placing the source as the 5th accreting neutron star (NS) exhibiting d...