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Keck II spectroscopy of mHz quasi-periodic oscillations in Hercules X-1

Abstract:

We present Keck II spectroscopy of optical mHz quasi-periodic oscillations (QPOs) in the light curve of the X-ray pulsar binary Hercules X-1. In the power spectrum it appears as 'peaked noise', with a coherency ∼2, a central frequency of 35 mHz and a peak-to-peak amplitude of 5 per cent. However, the dynamic power spectrum shows it to be an intermittent QPO, with a lifetime of ∼100 s, as expected if the lifetime of the orbiting material is equal to the thermal time-scale of the inner disc. We...

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Publication status:
Published

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Astrophysics
Boroson, B More by this author
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Journal:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume:
326
Issue:
3
Pages:
1067-1075
Publication date:
2001-09-21
DOI:
EISSN:
1365-2966
ISSN:
0035-8711
URN:
uuid:e3112354-ea4d-4b47-8785-234db92df7b2
Source identifiers:
351631
Local pid:
pubs:351631

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