Analysis of eight magnetic chemically peculiar stars with rotational modulation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F22%3A00128187" target="_blank" >RIV/00216224:14310/22:00128187 - isvavai.cz</a>

Result on the web

<a href="https://arxiv.org/pdf/2208.03301.pdf" target="_blank" >https://arxiv.org/pdf/2208.03301.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stac2799" target="_blank" >10.1093/mnras/stac2799</a>

Result language

angličtina

Original language name

Analysis of eight magnetic chemically peculiar stars with rotational modulation

Original language description

Since 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 &lt; B-z &gt;. In most cases, the phased light curve and &lt; B-z &gt; measurements show consistent variability. Using our rotation periods, and global stellar parameters derived from fitting Balmer line profiles, and from Geneva and Stromgren-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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Volume of the periodical

517

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

18

Pages from-to

5340-5357

UT code for WoS article

000881809100005

EID of the result in the Scopus database

2-s2.0-85145354588