000006245 001__ 6245
000006245 005__ 20230127145310.0
000006245 0247_ $$2DOI$$a10.1093/mnras/stac279
000006245 037__ $$aSCART-2023-0100
000006245 100__ $$aKobzar, O.
000006245 245__ $$aAnalysis of eight magnetic chemically peculiar stars with rotational modulation
000006245 260__ $$c2022
000006245 500__ $$aeprint: arXiv:2208.03301
000006245 520__ $$aSince the end of 2018, the Transiting Exoplanet Survey Satellite (TESS) has provided stellar photometry to the astronomical community. We have used TESS data to study rotational modulation in the light curves of a sample of chemically peculiar stars with measured large-scale magnetic fields (mCP stars). In general, mCP stars show inhomogeneous distributions of elements in their atmospheres that lead to spectroscopic (line profile) and photometric (light curve) variations commensurate with the rotational period. We analyzed the available TESS data from 50 sectors for eight targets after post-processing them in order to minimize systematic instrumental trends. Analysis of the light curves allowed us to determine rotational periods for all eight of our targets. For each star, we provide a phase diagram calculated using the derived period from the light curves and from the available measurements of the disc-averaged longitudinal magnetic field. In most cases, the phased light curve and z measurements show consistent variability. Using our rotation periods, and global stellar parameters derived from fitting Balmer line profiles, and from Geneva and Stroemgren-Crawford photometry, we determined the equatorial rotational velocities and calculated the respective critical rotational fractions v_eq/v_crit. We have shown from our sample that the critical rotational fraction decreases with stellar age, at a rate consistent with the magnetic braking observed in the larger population of mCP stars.
000006245 594__ $$aNO
000006245 6531_ $$aStars: chemically peculiar
000006245 6531_ $$astars: fundamental parameters
000006245 6531_ $$astars: individual: HD 10840; HD 22920; HD 24712; HD 38170; HD 63401; HD 74521; HD 77314; HD 86592
000006245 6531_ $$astars: magnetic field
000006245 6531_ $$astars: rotation
000006245 6531_ $$aAstrophysics - Solar and Stellar Astrophysics
000006245 700__ $$aKhalack, V.
000006245 700__ $$aBohlender, D.
000006245 700__ $$aMathys, G. 
000006245 700__ $$aShultz, M. E.
000006245 700__ $$aBowman, D. M.
000006245 700__ $$aPaunzen, E.
000006245 700__ $$aLovekin, C.
000006245 700__ $$aDavid-Uraz, A.
000006245 700__ $$aSikora, J.
000006245 700__ $$aLampens, P.
000006245 700__ $$aRichard, O.
000006245 773__ $$c5340 - 5357$$pMonthly Notices of the Royal Astronomical Society$$v517$$y2022
000006245 8560_ $$fpatricia.lampens@observatoire.be
000006245 85642 $$ahttps://ui.adsabs.harvard.edu/abs/2022MNRAS.517.5340K
000006245 905__ $$apublished in
000006245 980__ $$aREFERD