A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
A TESS search for donor-star pulsations in high-mass X-ray binaries
Tekijät: Ramsay Gavin, Hakala Pasi, Charles Philip A.
Kustantaja: OXFORD UNIV PRESS
Julkaisuvuosi: 2022
Journal: Monthly Notices of the Royal Astronomical Society
Tietokannassa oleva lehden nimi: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Lehden akronyymi: MON NOT R ASTRON SOC
Vuosikerta: 516
Numero: 1
Aloitussivu: 1219
Lopetussivu: 1236
Sivujen määrä: 18
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stac2223
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/176525505
Ground-based optical photometry of the counterparts of high-mass X-ray binaries (HMXBs) has revealed the presence of periodic modulations on time-scales of similar to 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 similar to 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 an HMXB), we find evidence for an outburst, the former being simultaneous 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.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
