Discovery of the Orbit of the X-ray pulsar OAO 1657-415
نویسندگان
چکیده
منابع مشابه
ASCA Observations of OAO 1657−415 and its Dust-Scattered X-Ray Halo
We report on two ASCA observations of the high-mass X-ray binary pulsar OAO 1657−415. A short observation near mid-eclipse caught the source in a lowintensity state, with a weak continuum and iron emission dominated by the 6.4-keV fluorescent line. A later, longer observation found the source in a high-intensity state and covered the uneclipsed through mid-eclipse phases. In the high-intensity ...
متن کاملOAO 1657 – 415 : A ‘ Missing Link ’ in High Mass X - ray Binaries ?
OAO1657–415 is only the seventh eclipsing X-ray pulsar known and therefore has the potential to yield only the seventh mass of a neutron star in an X-ray binary. Here we report photometric and spectroscopic observations of candidates for the optical counterpart to the system and identify a B5III or B6V star as a possible companion to the neutron star. We measure the observational parameters of ...
متن کاملSpectral classification of the mass donors in the high - mass X - ray binaries EXO 1722 - 363 and OAO 1657 - 415 . ⋆
Aims. We report near-infrared (NIR) observations of the mass donors of the eclipsing high-mass X-ray binary (HMXB) systems EXO 1722-363 and OAO 1657-415 in order to derive their accurate spectral classifications. Methods. ESO/VLT observations of the targets with the NIR spectrometer ISAAC were compared with several published NIR spectral atlases of O and B supergiants, an identification of each...
متن کاملINTEGRAL observations of OAO 1657−415: gamma-ray tomography of a B supergiant
OAO 1657−415 is an accreting pulsar in an eclipsing binary system. We analyzed the INTEGRAL core program observations of this object and obtained the eclipse light curve in the soft gamma-ray band between 15 and 40 keV. We note that the gamma rays from the pulsar allow to probe the density profile of the outer layers of the B supergiant companion. We find that the density profile of the outer l...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1993
ISSN: 0004-637X,1538-4357
DOI: 10.1086/186715