Intermittent Pulsations in an Accretion-powered Millisecond Pulsar

Autor:	Miriam I. Krauss, Deepto Chakrabarty, Philip Kaaret, Edward H. Morgan, Duncan K. Galloway
Rok vydání:	2006
Předmět:	Physics Millisecond Accretion (meteorology) Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Astrophysics Amplitude Pulsar Space and Planetary Science Millisecond pulsar Astrophysics::Solar and Stellar Astrophysics
Zdroj:	Monash University
ISSN:	1538-4357 0004-637X
DOI:	10.1086/510741
Popis:	We describe observations of the seventh accretion-powered millisecond pulsar, HETE J1900.1-2455 made with the Rossi X-ray Timing Explorer during the year of activity that followed its discovery in 2005 June. We detected intermittent pulsations at a peak fractional amplitude of 3%, but only in the first two months of the outburst. On three occasions during this time we observed an abrupt increase in the pulse amplitude, approximately coincident with the time of a thermonuclear burst, followed by a steady decrease on a timescale of approx. 10 d. HETE J1900.1-2455 has shown the longest active period by far for any transient accretion-powered millisecond pulsar, comparable instead to the outburst cycles for other transient X-ray binaries. Since the last detection of pulsations, HETE J1900.1-2455 has been indistinguishable from a low-accretion rate, non-pulsing LMXB; we hypothesize that other, presently active LMXBs may have also been detectable initially as millisecond X-ray pulsars. Comment: 5 pages, 3 figures, accepted by ApJL following minor revisions suggested by referee
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d51e121dbacc450bab42be96f194d876 https://doi.org/10.1086/510741 Zobrazit plný text záznamu