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- W3216949306 abstract "One objective of the Polstar spectropolarimetry mission is to characterize the degree of nonconservative mass transfer that occurs at various stages of binary evolution, from the initial mass reversal to the late Algol phase. The proposed instrument combines spectroscopic and polarimetric capabilities, where the spectroscopy can resolve Doppler shifts in UV resonance lines with 10 km/s precision, and polarimetry can resolve linear polarization with 1e-3 precision or better. The spectroscopy will identify absorption by mass streams seen in projection against the stellar disk as a function of orbital phase, as well as scattering from extended splash structures and a circumbinary disk of material that fails to be transferred conservatively. The polarimetry affects more the light coming from material not seen against the stellar disk, allowing the geometry of the scattering to be tracked, resolving ambiguities left by the spectroscopy and light-curve information. For example, nonconservative mass streams ejected in the polar direction will produce polarization of the opposite sign from conservative transfer accreting in the orbital plane. Also, time domain coverage over a range of phases of the binary orbit are well supported by the Polstar observing strategy. Combining these elements will significantly improve our understanding of the mass transfer process and the amount of mass that can escape from the system, an important channel for changing the final mass, and ultimate supernova, of the large number of massive stars found in binaries at close enough separation to undergo interaction." @default.
- W3216949306 created "2021-12-06" @default.
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- W3216949306 date "2021-11-28" @default.
- W3216949306 modified "2023-09-27" @default.
- W3216949306 title "Ultraviolet Spectropolarimetry with Polstar: Conservative and Nonconservative Mass Transfer in OB Interacting Binaries" @default.
- W3216949306 hasPublicationYear "2021" @default.
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