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HD 143 418 - an interacting binary with the subsynchronously rotating primary

Basic information
Original title:HD 143 418 - an interacting binary with the subsynchronously rotating primary
Authors:Zdeněk Mikulášek, Juraj Zverko, Jozef Žižnovský, Jiří Krtička, Ilian Kh. Iliev, Dmitry O. Kudryavtsev, Tomáš Gráf, Miloslav Zejda
Further information
Citation:MIKULÁŠEK, Zdeněk, Juraj ZVERKO, Jozef ŽIŽNOVSKÝ, Jiří KRTIČKA, Ilian Kh. ILIEV, Dmitry O. KUDRYAVTSEV, Tomáš GRÁF and Miloslav ZEJDA. HD 143 418 - an interacting binary with the subsynchronously rotating primary. In Mezinárodní konference: Binary stars - key to comprension of the Universe, Brno, 8.-12.6.2009. 2009.Export BibTeX
@misc{864212,
author = {Mikulášek, Zdeněk and Zverko, Juraj and Žižnovský, Jozef and Krtička, Jiří and Iliev, Ilian Kh. and Kudryavtsev, Dmitry O. and Gráf, Tomáš and Zejda, Miloslav},
booktitle = {Mezinárodní konference: Binary stars - key to comprension of the Universe, Brno, 8.-12.6.2009},
keywords = {HD 143 418},
language = {eng},
title = {HD 143 418 - an interacting binary with the subsynchronously rotating primary},
year = {2009}
}
Original language:English
Field:Astronomy and astrophysics
Type:Vyžádané přednášky
Keywords:HD 143 418

HD 143 418 is a non-eclipsing close binary with orbital period Porb = 2.282520 d. The photometrically and spectroscopically dominant primary component is a normal A5V star in the middle of its stay on the main sequence with extremely slow, subsynchronous rotation (Prot about 12 d!). Its photometric monitoring since 1982 revealed orbitally modulated variations with changing form and amplitude. PCA disentangling extracted a constant part of light curves obviously caused by the ellipticity of the primary. Seasonal components of light curves may be related to the expected incidence of circumstellar matter ejected from tidally spinning up primary component. A possible scenario of the synchronization process is also briefly discussed.

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