Return of 4U 1730–22 after 49 yr Silence: The Peculiar Burst Properties of the 2021/2022 Outbursts Observed by Insight-HXMT

• Published in: The Astrophysical journal Vol. 942; no. 2; pp. 97 - 110
• Main Authors: Chen, Yu-Peng, Zhang, Shu, Ji, Long, Zhang, Shuang-Nan, Wang, Peng-Ju, Kong, Ling-Da, Chang, Zhi, Peng, Jing-Qiang, Shui, Qing-Cang, Li, Jian, Li, Zhao-Sheng, Tao, Lian, Ge, Ming-Yu, Qu, Jin-Lu
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 01.01.2023; IOP Publishing
• Subjects: Astrophysics; Bursts; Corona; Deposition; Evaporation; Luminosity; Neutron stars; Neutrons; Occlusion; Outbursts; Photosphere; Spectroscopy; X-ray bursters; X-ray bursts; X-rays

Staying in quiescence for 49 yr, 4U 1730–22 became active and had two outbursts in 2021 and 2022; 10 thermonuclear X-ray bursts were detected with Insight-HXMT. Among them, the faintest burst showed a double-peaked profile, placing the source as the seventh accreting neutron star (NS) exhibiting dou...