Open AccessDiscovery of the Millisecond X‐Ray Pulsar HETE J1900.1−2455
Author(s) -
P. Kaaret,
E. Morgan,
R. Vanderspek,
John A. Tomsick
Publication year - 2006
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/498886
Subject(s) - physics , astrophysics , neutron star , millisecond pulsar , pulsar , roche lobe , orbital period , x ray binary , low mass , millisecond , astronomy , flux (metallurgy) , orbit (dynamics) , binary star , stars , materials science , engineering , metallurgy , aerospace engineering
We report the discovery of millisecond pulsations from the low-mass X-raybinary HETE J1900.1-2455 which was discovered by the detection of a type IX-ray burst by the High Energy Transient Explorer 2 (HETE-2). The neutron staremits coherent pulsations at 377.3 Hz and is in an 83.3 minute circular orbitwith a companion with a mass greater than 0.016 solar masses and likely lessthan 0.07 solar masses. The companion star's Roche lobe could be filled by abrown dwarf with no need for heating or non-standard evolution. During oneinterval with an unusually high X-ray flux, the source produced quasiperiodicoscillations with a single peak at 883 Hz and on subsequent days, thepulsations were suppressed. We consider the distribution of spin versus orbitalperiod in neutron star low-mass X-ray binaries.Comment: 8 pages, to appear in Ap
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