Photometric variability of the LAMOST sample of magnetic
chemically peculiar stars as seen by TESS

J 2023

Photometric variability of the LAMOST sample of magnetic chemically peculiar stars as seen by TESS

LABADIE-BARTZ, J., S. HÜMMERICH, K. BERNHARD, Ernst PAUNZEN, M. E. SHULTZ et. al.

Základní údaje

Originální název

Photometric variability of the LAMOST sample of magnetic chemically peculiar stars as seen by TESS

Autoři

LABADIE-BARTZ, J., S. HÜMMERICH, K. BERNHARD, Ernst PAUNZEN (40 Rakousko, domácí) a M. E. SHULTZ

Vydání

Astronomy and Astrophysics, EDP Sciences, 2023, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 6.500 v roce 2022

Kód RIV

RIV/00216224:14310/23:00133046

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/202346657

UT WoS

001048573300007

Klíčová slova anglicky

stars: chemically peculiar; stars: rotation; techniques: photometric; binaries: eclipsing; stars: oscillations

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 16. 1. 2024 12:57, Mgr. Marie Šípková, DiS.

Anotace

V originále

Context. High-quality light curves from space-based missions have opened up a new window on the rotational and pulsational properties of magnetic chemically peculiar (mCP) stars and have fuelled asteroseismic studies. They allow the internal effects of surface magnetic fields to be probed and numerous astrophysical parameters to be derived with great precision.Aims. We present an investigation of the photometric variability of a sample of 1002 mCP stars discovered in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) archival spectra with the aims of measuring their rotational periods and identifying interesting objects for follow-up studies.Methods. Transiting Exoplanet Survey Satellite (TESS) data were available for 782 mCP stars and were analysed using a Fourier two-term frequency fit to determine the stars' rotational periods. The rotational signal was then subtracted from the light curve to identify additional non-rotational variability signals. A careful pixel-level blending analysis was performed to check whether the variability originates in the target star or a nearby blended neighbour. We investigated correlations between the observed rotational periods, fractional age on the main sequence, mass, and several other observables.Results. We present rotational periods and period estimates for 720 mCP stars. In addition, we have identified four eclipsing binary systems that likely host an mCP star, as well as 25 stars with additional signals consistent with pulsation (12 stars with frequencies above 10 day(-1) and 13 stars with frequencies below 10 day(-1)). We find that more evolved stars have longer rotation periods, which is in agreement with the assumption of the conservation of angular momentum during the main-sequence evolution.Conclusions. With our work, we increase the sample size of mCP stars with known rotation periods and identify prime candidates for detailed follow-up studies. This enables two paths towards future investigations: population studies of even larger samples of mCP stars and the detailed characterisation of high-value targets.

Citovat

LABADIE-BARTZ, J., S. HÜMMERICH, K. BERNHARD, Ernst PAUNZEN a M. E. SHULTZ. Photometric variability of the LAMOST sample of magnetic chemically peculiar stars as seen by TESS. Astronomy and Astrophysics. EDP Sciences, 2023, roč. 676, August, s. 1-14. ISSN 0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202346657.

@article{2361601,
   author = {LabadieandBartz, J. and Hümmerich, S. and Bernhard, K. and Paunzen, Ernst and Shultz, M. E.},
   article_number = {August},
   doi = {http://dx.doi.org/10.1051/0004-6361/202346657},
   keywords = {stars: chemically peculiar; stars: rotation; techniques: photometric; binaries: eclipsing; stars: oscillations},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy and Astrophysics},
   title = {Photometric variability of the LAMOST sample of magnetic chemically peculiar stars as seen by TESS},
   url = {https://doi.org/10.1051/0004-6361/202346657},
   volume = {676},
   year = {2023}
}

TY  - JOUR
ID  - 2361601
AU  - Labadie-Bartz, J. - Hümmerich, S. - Bernhard, K. - Paunzen, Ernst - Shultz, M. E.
PY  - 2023
TI  - Photometric variability of the LAMOST sample of magnetic chemically peculiar stars as seen by TESS
JF  - Astronomy and Astrophysics
VL  - 676
IS  - August
SP  - 1-14
EP  - 1-14
PB  - EDP Sciences
SN  - 00046361
KW  - stars: chemically peculiar
KW  - stars: rotation
KW  - techniques: photometric
KW  - binaries: eclipsing
KW  - stars: oscillations
UR  - https://doi.org/10.1051/0004-6361/202346657
N2  - Context. High-quality light curves from space-based missions have opened up a new window on the rotational and pulsational properties of magnetic chemically peculiar (mCP) stars and have fuelled asteroseismic studies. They allow the internal effects of surface magnetic fields to be probed and numerous astrophysical parameters to be derived with great precision.Aims. We present an investigation of the photometric variability of a sample of 1002 mCP stars discovered in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) archival spectra with the aims of measuring their rotational periods and identifying interesting objects for follow-up studies.Methods. Transiting Exoplanet Survey Satellite (TESS) data were available for 782 mCP stars and were analysed using a Fourier two-term frequency fit to determine the stars' rotational periods. The rotational signal was then subtracted from the light curve to identify additional non-rotational variability signals. A careful pixel-level blending analysis was performed to check whether the variability originates in the target star or a nearby blended neighbour. We investigated correlations between the observed rotational periods, fractional age on the main sequence, mass, and several other observables.Results. We present rotational periods and period estimates for 720 mCP stars. In addition, we have identified four eclipsing binary systems that likely host an mCP star, as well as 25 stars with additional signals consistent with pulsation (12 stars with frequencies above 10 day(-1) and 13 stars with frequencies below 10 day(-1)). We find that more evolved stars have longer rotation periods, which is in agreement with the assumption of the conservation of angular momentum during the main-sequence evolution.Conclusions. With our work, we increase the sample size of mCP stars with known rotation periods and identify prime candidates for detailed follow-up studies. This enables two paths towards future investigations: population studies of even larger samples of mCP stars and the detailed characterisation of high-value targets.
ER  -

LABADIE-BARTZ, J., S. HÜMMERICH, K. BERNHARD, Ernst PAUNZEN a M. E. SHULTZ. Photometric variability of the LAMOST sample of magnetic chemically peculiar stars as seen by TESS. \textit{Astronomy and Astrophysics}. EDP Sciences, 2023, roč.~676, August, s.~1-14. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202346657.

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