Searching for periodicities in the MACHO light curve of LMC X-2

Alcock, C.; Allsman, R. A.; Alves, D. R.; Axelrod, T. S.; Becker, A. C.; Bennett, D. P.; Charles, P. A.; Cook, K. H.; Drake, A. J.; Freeman, K. C.; Geha, Marla; Griest, K.; Groot, P.; Lehner, M. J.; Marshall, S.; McGowan, K.; Minniti, D.; Nelson, C A; Peterson, Bruce A.; Popowski, Piotr; Pratt, M. R.; Quinn, Peter J.; Sutherland, William J.; Tomaney, A.; Vandehei, T.; Paradijs, J. van

doi:10.1046/j.1365-8711.2000.03511.x

Monthly Notices of the Royal Astronomical Society

2000

DOI: 10.1046/j.1365-8711.2000.03511.x

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Searching for periodicities in the MACHO light curve of LMC X-2

C. Alcock

R. A. Allsman

D. R. Alves

et al.

Abstract: Using the exceptional long-term monitoring capabilities of the MACHO project, we present here the optical history of LMC X-2 for a continuous 6-yr period. These data were used to investigate the previously claimed periodicities for this source of 8.15 h and 12.54 d : we find upper amplitude limits of 0.10 mag and 0.09 mag, respectively.Comment: 4 pages, 4 figures. Minor changes, including title. MNRAS, in pres

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Cited by 4 publications

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“…Even the estimates for the orbital period range from 6.4 h (Motch et al 1985) or 8.2 h (Callanan et al 1990;Smale & Kuulkers 2000) up to 12 d by Crampton et al (1990). To make things even more complicated, no periodic variability was detected in 6 yr of massive compact halo object data (Alcock et al 2000).…”

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confidence: 99%

A signature of the donor star in the extra-galactic X-ray binary LMC X−2

Cornelisse¹,

Steeghs²,

Casares³

et al. 2007

Monthly Notices of the Royal Astronomical Society

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Two nights of phase‐resolved medium‐resolution Very Large Telescope spectroscopy of the extra‐galactic low‐mass X‐ray binary LMC X−2 have revealed a 0.32 ± 0.02 d spectroscopic period in the radial velocity curve of the He iiλ4686 emission line that we interpret as the orbital period. However, similar to previous findings, this radial velocity curve shows a longer term variation that is most likely due to the presence of a precessing accretion disc in LMC X−2. This is strengthened by He iiλ4686 Doppler maps that show a bright spot that is moving from night to night. Furthermore, we detect narrow emission lines in the Bowen region of LMC X−2, with a velocity of Kem= 351 ± 28 km s−1, that we tentatively interpret as coming from the irradiated side of the donor star. Since Kem must be smaller than K2, this leads to the first upper limit on the mass function of LMC X−2 of f(M1) ≥ 0.86 M⊙ (95 per cent confidence), and the first constraints on its system parameters.

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mentioning

confidence: 99%

A signature of the donor star in the extra-galactic X-ray binary LMC X−2

Cornelisse¹,

Steeghs²,

Casares³

et al. 2007

Monthly Notices of the Royal Astronomical Society

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Observational properties of accretion discs: Precessing and warped?

Charles

Clarkson

Cornelisse

et al. 2008

New Astronomy Reviews

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Correlated optical and X-ray variability in LMC X-2

McGowan

Charles

O’Donoghue

et al. 2003

Monthly Notices of the Royal Astronomical Society

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We have obtained high time resolution (seconds) photometry of LMC X‐2 in 1997 December, simultaneously with the Rossi X‐ray Timing Explorer (RXTE), in order to search for correlated X‐ray and optical variability on time‐scales from seconds to hours. We find that the optical and X‐ray data are correlated only when the source is in a high, active X‐ray state. Our analysis shows evidence for the X‐ray emission leading the optical with a mean delay of <20 s. The time‐scale for the lag can be reconciled with disc reprocessing, driven by the higher‐energy X‐rays, only by considering the lower limit for the delay. The results are compared with a similar analysis of archival data of Sco X‐1.

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Searching for periodicities in the MACHO light curve of LMC X-2

Cited by 4 publications

References 29 publications

A signature of the donor star in the extra-galactic X-ray binary LMC X−2

A signature of the donor star in the extra-galactic X-ray binary LMC X−2

Observational properties of accretion discs: Precessing and warped?

Correlated optical and X-ray variability in LMC X-2

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