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Anna N. Żytkow
Anna N. Żytkow is a Polish astrophysicist working at the Institute of Astronomy of the University of Cambridge.
==Thorne-Żytkow objects==
Working together with Kip Thorne in 1976, Żytkow developed a theoretical model for a new star type, the Thorne–Żytkow object (TŻO), which contains either a neutron star or a black hole core at the center of a stellar envelope. The evolution of such a star occurs rarely and only two processes exist that define the structure and evolution of a TŻO. In the first process a collision between a neutron star and a normal star, either dwarf or giant, must occur in order to merge the two into a single object.〔 This occurrence is rare since stars do not usually collide with each other. This could only happen in a dense cluster of stars. The second possible evolution of a larger TŻO can occur when a star expands into a red supergiant a and engulfs its companion neutron star.〔
A team led by Emily Levesque (University of Colorado at Boulder) and including Anna Żytkow found the first viable TŻO candidate using the 6.5-meter Magellan Clay Telescope at Las Campanas Observatory in 2014, possibly succeeding in a search for these bizarre stars, one that had already spanned some 40 years worth of effort.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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