Journal Article

Millihertz quasi-periodic optical oscillations in 4U 0614+091

Y. Zhang, R. I. Hynes and E. L. Robinson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 4, pages 2943-2948
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19935.x
Millihertz quasi-periodic optical oscillations in 4U 0614+091

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We report the discovery of a 1-mHz optical quasi-periodic oscillation (QPO) in the candidate ultra-compact low-mass X-ray binary 4U 0614+091. The ultra-low-frequency QPO has no X-ray counterpart in contemporaneous RXTE/PCA data and is likely a signature of structure in the accretion disc. The QPO can be reasonably fitted with a single sine wave but with a phase jump part way through the observation, indicating that it is not coherent. We also identify a 48-min modulation, approximately consistent with the suggested orbital period of O’Brien and Shahbaz et al. If this is indeed orbital, it supports an identification of 4U 0614+091 as an ultra-compact source.

Keywords: binaries: close; stars: individual: 4U 0614+091; stars: individual: V1055 Ori; X-rays: binaries

Journal Article.  4143 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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