Magnetic chemically peculiar stars investigated by the Solar
Mass Ejection Imager

J 2021

Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager

PAUNZEN, Ernst, Johana SUPÍKOVÁ, Klaus BERNHARD, Stefan HÜMMERICH, Michal PRIŠEGEN et. al.

Basic information

Original name

Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager

Authors

PAUNZEN, Ernst (40 Austria, guarantor, belonging to the institution), Johana SUPÍKOVÁ (203 Czech Republic, belonging to the institution), Klaus BERNHARD, Stefan HÜMMERICH and Michal PRIŠEGEN (703 Slovakia, belonging to the institution)

Edition

Monthly Notices of the Royal Astronomical Society, Oxford University Press, 2021, 0035-8711

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 5.235

RIV identification code

RIV/00216224:14310/21:00121824

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1093/mnras/stab1100

UT WoS

000656139300042

Keywords in English

stars: chemically peculiar; stars: early-type; Hertzsprung-Russell and colour-magnitude diagrams; stars: variables: general

Abstract

V originále

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.

Links

98507, interní kód MU

Name: European Collaborating Astronomer ProjectS: Espana-Czechia-Slovakia (Acronym: ECAPS:E-C-S)

Investor: European Union, Strategic Partnerships in the field of education, training and youth

Citovat

PAUNZEN, Ernst, Johana SUPÍKOVÁ, Klaus BERNHARD, Stefan HÜMMERICH and Michal PRIŠEGEN. Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager. Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2021, vol. 504, No 3, p. 3758-3772. ISSN 0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stab1100.

@article{1778123,
   author = {Paunzen, Ernst and Supíková, Johana and Bernhard, Klaus and Hümmerich, Stefan and Prišegen, Michal},
   article_number = {3},
   doi = {http://dx.doi.org/10.1093/mnras/stab1100},
   keywords = {stars: chemically peculiar; stars: early-type; Hertzsprung-Russell and colour-magnitude diagrams; stars: variables: general},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager},
   url = {https://doi.org/10.1093/mnras/stab1100},
   volume = {504},
   year = {2021}
}

TY  - JOUR
ID  - 1778123
AU  - Paunzen, Ernst - Supíková, Johana - Bernhard, Klaus - Hümmerich, Stefan - Prišegen, Michal
PY  - 2021
TI  - Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 504
IS  - 3
SP  - 3758-3772
EP  - 3758-3772
PB  - Oxford University Press
SN  - 00358711
KW  - stars: chemically peculiar
KW  - stars: early-type
KW  - Hertzsprung-Russell and colour-magnitude diagrams
KW  - stars: variables: general
UR  - https://doi.org/10.1093/mnras/stab1100
N2  - 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.
ER  -

PAUNZEN, Ernst, Johana SUPÍKOVÁ, Klaus BERNHARD, Stefan HÜMMERICH and Michal PRIŠEGEN. Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford University Press, 2021, vol.~504, No~3, p.~3758-3772. ISSN~0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stab1100.

Detailed Information on Publication Record