Physical processes in Cygnus X-2
نویسندگان
چکیده
منابع مشابه
Ginga observations of Cygnus X - 2
Wehave analysed all availableX-ray data on the lowmass X-ray binary Cygnus X-2 obtained with the Ginga satellite. A detailed analysis of the spectral and fast timing behaviour of these 4 years of data provides new insights in the behaviour of this Z source. We confirm the previously observed recurrent patterns of behaviour in the X-ray colour-colour and hardnessintensity diagrams consisting of ...
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We consider the unusual evolutionary state of the secondary star in Cygnus X-2. Spectroscopic data give a low mass (M 2 ' 0:5 ? 0:7M) and yet a large radius (R 2 ' 7R) and high luminosity (L 2 ' 150L). We show that this star closely resembles a remnant of early massive Case B evolution, during which the neutron star ejected most of the 3M transferred from the donor (initial mass M 2i 3:6M) on i...
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We consider the unusual evolutionary state of the secondary star in Cygnus X-2. Spectroscopic data give a low mass (M 2 ≃ 0.5 − 0.7M ⊙) and yet a large radius (R 2 ≃ 7R ⊙) and high luminosity (L 2 ≃ 150L ⊙). We show that this star closely resembles a remnant of early massive Case B evolution, during which the neutron star ejected most of the ∼ 3M ⊙ transferred from the donor (initial mass M 2i ...
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We present phase resolved optical spectroscopy and Doppler tomography of V1341 Cygni, the optical counterpart to the neutron star low mass X-ray binary Cygnus X-2. We derive a radial velocity curve for the secondary star, finding a projected radial velocity semi-amplitude ofK2 = 79±3 km s , leading to a mass function of 0.51± 0.06 M⊙, ∼30% lower than the previous estimate. We tentatively attrib...
متن کاملCygnus X-2, super-Eddington accretion, and pulsar binaries
We consider the unusual evolutionary state of the secondary star in Cygnus X-2. Spectroscopic data give a low mass (M2 ≃ 0.5− 0.7M⊙) and yet a large radius (R2 ≃ 7R⊙) and high luminosity (L2 ≃ 150L⊙). We show that this star closely resembles a remnant of early massive Case B evolution, during which the neutron star ejected most of the ∼ 2M⊙ transferred from the donor (initial mass M2i ∼ 3.6M⊙) ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1970
ISSN: 0074-1809
DOI: 10.1017/s0074180900004356