Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F21%3A00121824" target="_blank" >RIV/00216224:14310/21:00121824 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1093/mnras/stab1100" target="_blank" >https://doi.org/10.1093/mnras/stab1100</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stab1100" target="_blank" >10.1093/mnras/stab1100</a>

Result language

angličtina

Original language name

Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager

Original language description

Since the discovery of the spectral peculiarities of their prototype α2 Canum Venaticorum in 1897, the so-called ACV variables, which are comprised of several groups of chemically peculiar stars of the upper main sequence, have been the target of numerous photometric and spectroscopic studies. Especially for the brighter ACV variables, continuous observations over about a century are available, which are important to study long-term effects such as period changes or magnetic cycles in these objects. This work presents an analysis of 165 Ap/CP2 and He-weak/CP4 stars using light curves obtained by the Solar Mass Ejection Imager (SMEI) between the years 2003 and 2011. These data fill an important gap in observations for bright ACV variables between the Hipparcos and TESS satellite missions. Using specifically tailored data treatment and period search approaches, we find variability in the accuracy limit of the employed data in 84 objects. The derived periods are in excellent agreement with the literature; for one star, the here presented solution represents the first published period. We discuss the apparently constant stars and the corresponding level of non-variability. From an investigation of our target star sample in the Hertzsprung–Russell diagram, we deduce ages between 100 Myr and 1 Gyr for the majority of our sample stars. Our results support that the variable CP2/4 stars are in a more advanced evolutionary state and that He and Si peculiarities, preferentially found in the hotter, and thus more massive, CP stars, produce larger spots or spots of higher contrast.

Czech name

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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

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2021

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

504

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

3758-3772

UT code for WoS article

000656139300042

EID of the result in the Scopus database

2-s2.0-85107899547