Journal Article

Searching for the orbital period of the ultraluminous X-ray source NGC 1313 X-2

L. Zampieri, D. Impiombato, R. Falomo, F. Grisé and R. Soria

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 2, pages 1331-1337
Published in print January 2012 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19790.x
Searching for the orbital period of the ultraluminous X-ray source NGC 1313 X-2

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We analysed the longest phase-connected photometric data set available for NGC 1313 X-2, looking for the ∼6-day modulation reported by Liu et al.. The folded B-band light curve shows a ∼6-day periodicity with a significance slightly larger than 3σ. The low statistical significance of this modulation, along with the lack of detection in the V band, makes its identification uncertain.

Keywords: techniques: photometric; stars: individual: NGC 1313 X-2; stars: variables: general; galaxies: individual: NGC 1313; X-rays: binaries; X-rays: individual: NGC 1313 X-2

Journal Article.  5431 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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