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Global One-armed Oscillations in the Be/X-ray Binary LS I +61° 235/RX J0146.9+6121

Published online by Cambridge University Press:  12 April 2016

P. Reig ,
I. Negueruela ,
M.J. Coe ,
J. Fabregat  and
A.E. Tarasov
P. Reig
Affiliation:
Foundation for Research and Technology-Hellas, Crete, Greece Physics Department, University of Crete, Crete, Greece
I. Negueruela
Affiliation:
SAX SDC, Agenzia Spaziale Italiana, Roma, Italy
M.J. Coe
Affiliation:
Physics & Astronomy Department, Southampton University, UK
J. Fabregat
Affiliation:
Departament d’Astronomia, Universitat de Valéncia, Spain
A.E. Tarasov
Affiliation:
Crimean Astrophysical Observatory, Crimea, Ukraine

Abstract

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We present results of our long-term monitoring of LS I +61° 235 in the optical and infrared bands. This Be/X-ray binary exhibits V/R variability in the Hα line, which can be explained in the framework of the Global One-armed Oscillation model: a high density perturbation moves around inside the circumstellar disc of the Be star. The V>R and V<R peaks occur when the perturbation moves towards and away from the observer, respectively. In this work we show that the perturbation also affects the He I λ6678Å and Paschen lines. We also report on a correlation between the infrared emission and the V/R variability.

Type
7. Interacting Binaries
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 719 - 722
Copyright
Copyright © Astronomical Society of the Pacific 2000

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