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Grain formation in post-shocked wind collisions of massive binary systems

Published online by Cambridge University Press:  26 May 2016

Diego Falceta-Gonçalves ,
Vera Jatenco-Pereira  and
Zulema Abraham
Diego Falceta-Gonçalves
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, USP, Rua do Matão 1226, 05508-090 São Paulo, Brasil
Vera Jatenco-Pereira
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, USP, Rua do Matão 1226, 05508-090 São Paulo, Brasil
Zulema Abraham
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, USP, Rua do Matão 1226, 05508-090 São Paulo, Brasil

Abstract

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Massive binary star systems are not uncommon, and neither the supersonic collision of their winds. In the present work we study these shocks and the further consequences on wind structure. The post-shock gas is a warm and high-density environment, which allows dust to form and grow. We show that this growth is fast, of just a few hours. An application to η Car shows that, probably, the decline of X-rays fluxes observed in its light curve is the consequence of its high absorption in periodic dust formation events, at periastron passage.

Type
Part 1. Atmospheres of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 178 - 179
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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