Global properties of the light curves of magnetic, chemically
peculiar stars as a testbed for the existence of dipole-like
symmetry in surface structures

J 2019

Global properties of the light curves of magnetic, chemically peculiar stars as a testbed for the existence of dipole-like symmetry in surface structures

JAGELKA, Miroslav, Zdeněk MIKULÁŠEK, Stefan HÜMMERICH a Ernst PAUNZEN

Základní údaje

Originální název

Global properties of the light curves of magnetic, chemically peculiar stars as a testbed for the existence of dipole-like symmetry in surface structures

Autoři

JAGELKA, Miroslav (703 Slovensko, garant, domácí), Zdeněk MIKULÁŠEK (203 Česká republika, domácí), Stefan HÜMMERICH a Ernst PAUNZEN (40 Rakousko, domácí)

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2019, 1432-0746

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

arXiv

Impakt faktor

Impact factor: 5.636

Kód RIV

RIV/00216224:14310/19:00107324

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/201833482

UT WoS

000459092400001

Klíčová slova anglicky

stars: variables: general; stars: atmospheres; stars: chemically peculiar

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 17. 3. 2020 12:13, Mgr. Marie Šípková, DiS.

Anotace

V originále

Context. Magnetic, chemically peculiar stars are known for exhibiting surface abundance inhomogeneities (chemical spots) that lead to photometric and spectroscopic variability with the rotation period. It is commonly assumed that the surface structures are causally connected with the global magnetic field that dominates the photospheric and subphotospheric layers of these stars. As a rule, the observed magnetic fields show a simple dipole-like geometry, with the magnetic axis being noncollinear to the rotational one. Aims. The present study aims at detecting underlying patterns in the distribution of photometric spots in a sample of 650 magnetic, chemically peculiar stars and examines their link to the magnetic field topology. Methods. Photometric time-series observations from the ASAS-3 archive were employed to inspect the light-curve morphology of our sample stars and divide them into representative classes described using a principal component analysis. Theoretical light curves were derived from numerous simulations assuming different spot parameters and following the symmetry of a simple dipole magnetic field. These were subsequently compared with the observed light curves. Results. The results from our simulations are in contradiction with the observations and predict a much higher percentage of double-wave light curves than is actually observed. We thereby conclude that the distribution of the chemical spots does not follow the magnetic field topology, which indicates that the role of the magnetic field in the creation and maintenance of the surface structures may be more subsidiary than what is predicted by theoretical studies.

Návaznosti

GA16-01116S, projekt VaV

Název: Atmosféry a okolohvězdné prostředí magnetických horkých hvězd

Investor: Grantová agentura ČR, Atmosféry a okolohvězdné prostředí magnetických horkých hvězd

Citovat

JAGELKA, Miroslav, Zdeněk MIKULÁŠEK, Stefan HÜMMERICH a Ernst PAUNZEN. Global properties of the light curves of magnetic, chemically peculiar stars as a testbed for the existence of dipole-like symmetry in surface structures. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2019, roč. 622, February, s. "A199"-"A205", 7 s. ISSN 1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201833482.

@article{1509638,
   author = {Jagelka, Miroslav and Mikulášek, Zdeněk and Hümmerich, Stefan and Paunzen, Ernst},
   article_location = {LES ULIS CEDEX A},
   article_number = {February},
   doi = {http://dx.doi.org/10.1051/0004-6361/201833482},
   keywords = {stars: variables: general; stars: atmospheres; stars: chemically peculiar},
   language = {eng},
   issn = {1432-0746},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {Global properties of the light curves of magnetic, chemically peculiar stars as a testbed for the existence of dipole-like symmetry in surface structures},
   url = {http://arxiv.org/abs/1902.00326},
   volume = {622},
   year = {2019}
}

TY  - JOUR
ID  - 1509638
AU  - Jagelka, Miroslav - Mikulášek, Zdeněk - Hümmerich, Stefan - Paunzen, Ernst
PY  - 2019
TI  - Global properties of the light curves of magnetic, chemically peculiar stars as a testbed for the existence of dipole-like symmetry in surface structures
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 622
IS  - February
SP  - "A199"-"A205"
EP  - "A199"-"A205"
PB  - EDP SCIENCES S A
SN  - 14320746
KW  - stars: variables: general
KW  - stars: atmospheres
KW  - stars: chemically peculiar
UR  - http://arxiv.org/abs/1902.00326
L2  - http://arxiv.org/abs/1902.00326
N2  - Context. Magnetic, chemically peculiar stars are known for exhibiting surface abundance inhomogeneities (chemical spots) that lead to photometric and spectroscopic variability with the rotation period. It is commonly assumed that the surface structures are causally connected with the global magnetic field that dominates the photospheric and subphotospheric layers of these stars. As a rule, the observed magnetic fields show a simple dipole-like geometry, with the magnetic axis being noncollinear to the rotational one. Aims. The present study aims at detecting underlying patterns in the distribution of photometric spots in a sample of 650 magnetic, chemically peculiar stars and examines their link to the magnetic field topology. Methods. Photometric time-series observations from the ASAS-3 archive were employed to inspect the light-curve morphology of our sample stars and divide them into representative classes described using a principal component analysis. Theoretical light curves were derived from numerous simulations assuming different spot parameters and following the symmetry of a simple dipole magnetic field. These were subsequently compared with the observed light curves. Results. The results from our simulations are in contradiction with the observations and predict a much higher percentage of double-wave light curves than is actually observed. We thereby conclude that the distribution of the chemical spots does not follow the magnetic field topology, which indicates that the role of the magnetic field in the creation and maintenance of the surface structures may be more subsidiary than what is predicted by theoretical studies.
ER  -

JAGELKA, Miroslav, Zdeněk MIKULÁŠEK, Stefan HÜMMERICH a Ernst PAUNZEN. Global properties of the light curves of magnetic, chemically peculiar stars as a testbed for the existence of dipole-like symmetry in surface structures. \textit{ASTRONOMY \&{}amp; ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2019, roč.~622, February, s.~''A199''-''A205'', 7 s. ISSN~1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201833482.

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