| KOCHUKHOV, O., V. KHALACK, O. KOBZAR, C. NEINER, Ernst PAUNZEN, J. LABADIE-BARTZ a A. DAVID-URAZ. TESS survey of rotational and pulsational variability of mercury-manganese stars. Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2021, roč. 506, č. 4, s. 5328-5344. ISSN 0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stab2107. |
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@article{1803569,
author = {Kochukhov, O. and Khalack, V. and Kobzar, O. and Neiner, C. and Paunzen, Ernst and LabadieandBartz, J. and DavidandUraz, A.},
article_number = {4},
doi = {http://dx.doi.org/10.1093/mnras/stab2107},
keywords = {binaries: close; stars: chemically peculiar; stars: early-type; stars: oscillations; stars: rotation; starspots},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {TESS survey of rotational and pulsational variability of mercury-manganese stars},
url = {https://academic.oup.com/mnras/article/506/4/5328/6325560},
volume = {506},
year = {2021}
}
TY - JOUR
ID - 1803569
AU - Kochukhov, O. - Khalack, V. - Kobzar, O. - Neiner, C. - Paunzen, Ernst - Labadie-Bartz, J. - David-Uraz, A.
PY - 2021
TI - TESS survey of rotational and pulsational variability of mercury-manganese stars
JF - Monthly Notices of the Royal Astronomical Society
VL - 506
IS - 4
SP - 5328-5344
EP - 5328-5344
PB - Oxford University Press
SN - 00358711
KW - binaries: close
KW - stars: chemically peculiar
KW - stars: early-type
KW - stars: oscillations
KW - stars: rotation
KW - starspots
UR - https://academic.oup.com/mnras/article/506/4/5328/6325560
N2 - 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.
ER -
KOCHUKHOV, O., V. KHALACK, O. KOBZAR, C. NEINER, Ernst PAUNZEN, J. LABADIE-BARTZ a A. DAVID-URAZ. TESS survey of rotational and pulsational variability of mercury-manganese stars. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford University Press, 2021, roč.~506, č.~4, s.~5328-5344. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stab2107.
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