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Red noise and pulsations in evolved massive stars

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arxiv 2101.05521 v1 pith:A4JS6OVJ submitted 2021-01-14 astro-ph.SR

Red noise and pulsations in evolved massive stars

classification astro-ph.SR
keywords starssampledetectedevolvedmassivenoisepropertiesvariability
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We examine high-cadence space photometry taken by the Transiting Exoplanet Survey Satellite (TESS) of a sample of evolved massive stars (26 Wolf-Rayet stars and 8 Luminous Blue Variables or candidate LBVs). To avoid confusion problems, only stars without bright Gaia neighbours and without evidence of bound companions are considered. This leads to a clean sample, whose variability properties should truly reflect the properties of the WR and LBV classes. Red noise is detected in all cases and its fitting reveals characteristics very similar to those found for OB-stars. Coherent variability is also detected for 20% of the WR sample. Most detections occur at moderately high frequency (3--14/d), hence are most probably linked to pulsational activity. This work doubles the number of WRs known to exhibit high-frequency signals.

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Cited by 1 Pith paper

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    astro-ph.SR 2025-09 unverdicted

    A curated review of TESS-era results across the major classes of variable stars, with illustrative light curves, but with no new observational or theoretical result.