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TESS survey of rota...
TESS survey of rotational and pulsational variability of mercury-manganese stars
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Observationell astrofysik
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- Khalack, V (författare)
- Univ Moncton, Dept Phys & Astron, Moncton, NB E1A 3E9, Canada.
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- Kobzar, O. (författare)
- Univ Moncton, Dept Phys & Astron, Moncton, NB E1A 3E9, Canada.
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- Neiner, C. (författare)
- Univ Paris, Sorbonne Univ, LESIA, Paris Observ,PSL Univ,CNRS, 5 Pl Jules Janssen, F-92195 Meudon, France.
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- Paunzen, E. (författare)
- Masaryk Univ, Dept Theoret Phys & Astrophys, Kotlarska 2, CZ-61137 Brno, Czech Republic.
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- Labadie-Bartz, J. (författare)
- Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226,Cidade Univ, BR-05508900 Sao Paulo, SP, Brazil.
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- David-Uraz, A. (författare)
- Howard Univ, Dept Phys & Astron, Washington, DC 20059 USA.;NASA GSFC, Ctr Res & Explorat Space Sci & Technol, Greenbelt, MD 20771 USA.;NASA GSFC, Xray Astrophys Lab, Greenbelt, MD 20771 USA.
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(creator_code:org_t)
- 2021-07-22
- 2021
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 506:4, s. 5328-5344
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Mercury-manganese (HgMn) stars are late-B upper main sequence chemically peculiar stars distinguished by large overabundances of heavy elements, slow rotation, and frequent membership in close binary systems. These stars lack strong magnetic fields typical of magnetic Bp stars but occasionally exhibit non-uniform surface distributions of chemical elements. The physical origin and the extent of this spot formation phenomenon remain unknown. Here, we use 2-min cadence light curves of 64 HgMn stars observed by the Transiting Exoplanet Survey Satellite (TESS) during the first 2 yr of its operation to investigate the incidence of rotational modulation and pulsations among HgMn stars. We found rotational variability with amplitudes of 0.1-3 mmag in 84 percent of the targets, indicating ubiquitous presence of star-spots on HgMn-star surfaces. Rotational period measurements reveal six fast-rotating stars with periods below 1.2 d, including one ultra-fast rotator (HD14228) with a 0.34-d period. We also identify several HgMn stars showing multiperiodic g-mode pulsations, tidally induced variation and eclipses in binary systems.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- binaries: close
- stars: chemically peculiar
- stars: early-type
- stars: oscillations
- stars: rotation
- starspots
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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