Open AccessDiscovery of a New X-Ray Burst/Millisecond Accreting Pulsar, HETE J1900.1-2455
Author(s) -
Motoko Suzuki,
Nobuyuki Kawai,
Toru Tamagawa,
Atsumasa Yoshida,
Y. E. Nakagawa,
Kaoru Tanaka,
Y. Shirasaki,
Masaru Matsuoka,
G. Ricker,
Roland Vanderspek,
N. Butler,
Donald Q. Lamb,
C. Graziani,
G. Pizzichini,
Rie Sato,
M. Arimoto,
J. Kotoku,
M. Maetou,
M. Yamauchi
Publication year - 2007
Publication title -
publications of the astronomical society of japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.99
H-Index - 110
eISSN - 2053-051X
pISSN - 0004-6264
DOI - 10.1093/pasj/59.1.263
Subject(s) - physics , astrophysics , millisecond pulsar , neutron star , pulsar , black body radiation , astronomy , radius , flux (metallurgy) , x ray binary , x ray pulsar , eddington luminosity , luminosity , radiation , nuclear physics , materials science , computer security , computer science , metallurgy , galaxy
A class of low-mass X-ray binary sources are known to be both X-ray burstsources and millisecond pulsars at the same time. A new source of this classwas discovered by High Energy Transient Explorer 2 (HETE-2) on 14 June 2005 asa source of type-I X-ray bursts, which was named HETE J1900.1-2455. Five X-raybursts from HETE J1900.1-2455 were observed during the summer of 2005. The timeresolved spectral analysis of these bursts have revealed that their spectra areconsistent with the blackbody radiation throughout the bursts. The bursts showthe indication of radius expansion. The bolometric flux remains almost constantduring the photospheric radius expansion while blackbody temperature droppedduring the same period. Assuming that the flux reached to the Eddington limiton a standard 1.4 solar mass neutron star with a helium atmosphere, we estimatethe distance to the source to be $\sim$ 4 kpc.Comment: 7 pages, 4 figure
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