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Study of Slowly Rotating CP Stars Observed with TESS

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KOBZAR O. KHALACK V. BOHLENDER D. DAVID-URAZ A. KASHKO P. BOWMAN D. M. LOVEKIN C. TVARDOVSKYI D. PERRON-CORMIER M. PAUNZEN Ernst SIKORA J. LAMPENS P. RICHARD O.

Rok publikování 2020
Druh Článek ve sborníku
Konference Proceedings of the Polish Astronomical Society, Vol. 11
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://www.pta.edu.pl/pliki/proc/vol11/v11p214.pdf
Klíčová slova stars: chemically peculiar; stars: individual; stars: oscillations; stars: magnetic fields; stars: variables
Popis Since the end of 2018, the Transiting Exoplanet Survey Satellite (TESS) provides high-quality space data on stellar photometry to the astronomical community. We present the results of an analysis of TESS photometric data for known slowly rotating, magnetic, chemically peculiar (mCP) stars. In general, mCP stars show an inhomogeneous distribution of elements in their stellar atmospheres that leads to spectroscopic (line profile) and photometric (light curve) variations over the rotation period. In the frame of the oblique magnetic rotator (OMR) model, patches of enhanced chemical abundance on the stellar surface reveal the frequency of stellar rotation. Using this approach, we have compiled a list of slowly rotating mCP stars with rotation periods longer than two days from the analysis of the photometric data provided by TESS for the first eight sectors of observations. Slowly rotating mCP stars usually possess a hydrodynamically stable stellar atmosphere where a magnetic field can amplify the process of atomic diffusion and this leads to the horizontal and vertical stratification of chemical abundances.

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