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Title:
Discovery of Burst Oscillations in the Intermittent Accretion-Powered Millisecond Pulsar HETE J1900.1-2455
Authors:
Watts, Anna L.; Altamirano, Diego; Linares, Manuel; Patruno, Alessandro; Casella, Piergiorgio; Cavecchi, Yuri; Degenaar, Nathalie; Rea, Nanda; Soleri, Paolo; van der Klis, Michiel; Wijnands, Rudy
Affiliation:
AA(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands ), AB(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands), AC(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands), AD(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands), AE(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands), AF(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands), AG(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands), AH(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands), AI(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands), AJ(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands), AK(Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands)
Publication:
The Astrophysical Journal Letters, Volume 698, Issue 2, pp. L174-L177 (2009). (ApJL Homepage)
Publication Date:
06/2009
Origin:
IOP
ApJ Keywords:
binaries: general, stars: individual: HETE J1900.1-2455, stars: neutron, stars: rotation, X-rays: bursts, X-rays: stars
DOI:
10.1088/0004-637X/698/2/L174
Bibliographic Code:
2009ApJ...698L.174W

Abstract

We report the discovery of burst oscillations from the intermittent accretion-powered millisecond pulsar (AMP) HETE J1900.1-2455, with a frequency ~1 Hz below the known spin frequency. The burst oscillation properties are far more similar to those of the non-AMPs and Aql X-1 (an intermittent AMP with a far lower duty cycle), than those of the AMPs SAX J1808.4-3658 and XTE J1814-338. We discuss the implications for models of the burst oscillation and intermittency mechanisms.
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