TESS survey of rotational and pulsational variability of mercury-manganese stars
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F21%3A00122850" target="_blank" >RIV/00216224:14310/21:00122850 - isvavai.cz</a>
Result on the web
<a href="https://academic.oup.com/mnras/article/506/4/5328/6325560" target="_blank" >https://academic.oup.com/mnras/article/506/4/5328/6325560</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stab2107" target="_blank" >10.1093/mnras/stab2107</a>
Alternative languages
Result language
angličtina
Original language name
TESS survey of rotational and pulsational variability of mercury-manganese stars
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
1365-2966
Volume of the periodical
506
Issue of the periodical within the volume
4
Country of publishing house
GB - UNITED KINGDOM
Number of pages
17
Pages from-to
5328-5344
UT code for WoS article
000705339100045
EID of the result in the Scopus database
2-s2.0-85118132483