A TESS search for donor-star pulsations in high-mass X-ray binaries
A TESS search for donor-star pulsations in high-mass X-ray binaries
Ground-based optical photometry of the counterparts of High-Mass X-ray Binaries (HMXBs) has revealed the presence of periodic modulations on timescales of ∼0.3-0.5 d. More recent space-based observations (Corot and TESS) of OB and Be stars have shown that pulsations caused by p and g modes are common in early type stars. We have therefore undertaken a systematic search for variability in the optical counterparts of 23 HMXBs (mostly neutron star systems, but including one black hole, Cyg X-1) using TESS data primarily in 2 min cadence mode. After removing the orbital period modulation in four systems, we find that all 23 sources show evidence for quasi-periodic variability on periods shorter than ∼1 d. We compare their power spectra with those from observations of other OB and Be type stars. In two systems, V725 Tau and HD 249179 (which may not be a HMXB), we find evidence for an outburst, the former being simultanous with an X-ray flare. We search for changes in the power spectra over the outburst duration, and compare them with outbursts seen in other Be systems.
X-rays: binaries, circumstellar matter, stars: early-type, stars: emission-line, Be-stars: oscillations
1219 - 1236
Ramsay, Gavin
fc8ef5f2-3d11-479b-aea4-c40b519b3c01
Hakala, Pasi
bb43c802-ef31-4bb6-b702-1d93b507767c
Charles, Philip
0429b380-0754-4dc1-8def-885c7fa6a086
2 September 2022
Ramsay, Gavin
fc8ef5f2-3d11-479b-aea4-c40b519b3c01
Hakala, Pasi
bb43c802-ef31-4bb6-b702-1d93b507767c
Charles, Philip
0429b380-0754-4dc1-8def-885c7fa6a086
Ramsay, Gavin, Hakala, Pasi and Charles, Philip
(2022)
A TESS search for donor-star pulsations in high-mass X-ray binaries.
Monthly Notices of the Royal Astronomical Society, 516 (1), .
(doi:10.1093/mnras/stac2223).
Abstract
Ground-based optical photometry of the counterparts of High-Mass X-ray Binaries (HMXBs) has revealed the presence of periodic modulations on timescales of ∼0.3-0.5 d. More recent space-based observations (Corot and TESS) of OB and Be stars have shown that pulsations caused by p and g modes are common in early type stars. We have therefore undertaken a systematic search for variability in the optical counterparts of 23 HMXBs (mostly neutron star systems, but including one black hole, Cyg X-1) using TESS data primarily in 2 min cadence mode. After removing the orbital period modulation in four systems, we find that all 23 sources show evidence for quasi-periodic variability on periods shorter than ∼1 d. We compare their power spectra with those from observations of other OB and Be type stars. In two systems, V725 Tau and HD 249179 (which may not be a HMXB), we find evidence for an outburst, the former being simultanous with an X-ray flare. We search for changes in the power spectra over the outburst duration, and compare them with outbursts seen in other Be systems.
Text
2208.02064
- Accepted Manuscript
Text
stac2223
- Version of Record
Available under License Other.
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Accepted/In Press date: 3 August 2022
Published date: 2 September 2022
Additional Information:
arXiv:2208.02064
Keywords:
X-rays: binaries, circumstellar matter, stars: early-type, stars: emission-line, Be-stars: oscillations
Identifiers
Local EPrints ID: 470737
URI: http://eprints.soton.ac.uk/id/eprint/470737
ISSN: 1365-2966
PURE UUID: 5ab89b96-8127-4ebd-bdd1-1ef25c3d7f67
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Date deposited: 19 Oct 2022 16:32
Last modified: 16 Mar 2024 22:23
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Author:
Gavin Ramsay
Author:
Pasi Hakala
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