Discovery of a new X-ray burst/millisecond accreting pulsar, HETE J1900.1-2455

作者：Suzuki Motoko^*; Kawai Nobuyuki; Tamagawa Toru; Yoshida Atsumasa; Nakagawa Yujin E; Tanaka Kaoru; Shirasaki Yuji; Matsuoka Masaru; Ricker George R; Vanderspek Roland; Butler Nat; Lamb Donald Q; Graziani Carlo; Pizzichini Graziella; Sato Rie; Arimoto Makoto; Kotoku Jun'ichi; Maetou Miki; Yamauchi Makoto

来源：Publications of the Astronomical Society of Japan, 2007, 59(1): 263-268.

DOI：10.1093/pasj/59.1.263

• stars : neutron
• stars : pulsars : individual (HETE J1900.1-2455)
• X-rays : bursts

A class of low-mass X-ray binary sources is known to be both X-ray burst sources and millisecond pulsars at the same time. A new source of this class was discovered by High Energy Transient Explorer 2 (HETE-2) on 2005 June 14 as a source of type-I X-ray bursts, which was named HETE J1900.1-2455. Five X-ray bursts from HETE J1900.1-2455 were observed during the summer of 2005. A time-resolved spectral analysis of these bursts has revealed that their spectra are consistent with the blackbody radiation throughout the bursts. The bursts show an indication of radius expansion. The bolometric flux remained almost constant during the photospheric radius expansion, while blackbody temperature dropped during the same period. Assuming that the flux reached the Eddington limit on a standard 1.4 solar-mass neutron star with a helium atmosphere, we estimate the distance to the source to be similar to 4 kpc.

• 出版日期2007
• 单位中国科学院国家天文台