Detailed Information on Publication Record
2018
Differential rotation in magnetic chemically peculiar stars
MIKULÁŠEK, Zdeněk, Jiří KRTIČKA, Ernst PAUNZEN, Michal ŠVANDA, Stephan HÜMMERICH et. al.Basic information
Original name
Differential rotation in magnetic chemically peculiar stars
Authors
MIKULÁŠEK, Zdeněk (203 Czech Republic, guarantor, belonging to the institution), Jiří KRTIČKA (203 Czech Republic, belonging to the institution), Ernst PAUNZEN (40 Austria, belonging to the institution), Michal ŠVANDA (203 Czech Republic), Stephan HÜMMERICH (276 Germany), Klaus BERNHARD (276 Germany), Miroslav JAGELKA (703 Slovakia, belonging to the institution), Jan JANÍK (203 Czech Republic, belonging to the institution), Greg W. HENRY (840 United States of America) and Matthew E. SHULTZ
Edition
Contributions of the Astronomical Observatory Skalnaté Pleso, 2018, 1335-1842
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
Slovakia
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 0.833
RIV identification code
RIV/00216224:14310/18:00101279
Organization unit
Faculty of Science
UT WoS
000432791300028
Keywords in English
stars: chemically peculiar; stars: rotation; stars: individual: sigma Ori E; CU Vir; V901 Ori; and BS Cir; space vehicles: Kepler
Tags
International impact, Reviewed
Změněno: 23/4/2024 12:36, Mgr. Michal Petr
V originále
Magnetic chemically peculiar (mCP) stars constitute about 10% of upper-main-sequence stars and are characterized by strong magnetic fields and abnormal photospheric abundances of some chemical elements. Most of them exhibit strictly periodic light, magnetic, radio, and spectral variations that can be fully explained by a rigidly rotating main-sequence star with persistent surface structures and a stable global magnetic field. Long-term observations of the phase curves of these variations enable us to investigate possible surface differential rotation with unprecedented accuracy and reliability. The analysis of the phase curves in the best-observed mCP stars indicates that the location and the contrast of photometric and spectroscopic spots as well as the geometry of the magnetic field remain constant for at least many decades. The strict periodicity of mCP variables supports the concept that the outer layers of upper-main-sequence stars do not rotate differentially. However, there is a small, inhomogeneous group consisting of a few mCP stars whose rotation periods vary on timescales of decades. The period oscillations may reflect real changes in the angular velocity of outer layers of the stars which are anchored by their global magnetic fields. In CU Vir, V901 Ori, and perhaps BS Cir, the rotational period variation indicates the presence of vertical differential rotation; however, its exact nature has remained elusive until now. The incidence of mCP stars with variable rotational periods is currently investigated using a sample of fifty newly identified Kepler mCP stars.
In Czech
Magnetic chemically peculiar (mCP) stars constitute about 10% of upper-main-sequence stars and are characterized by strong magnetic fields and abnormal photospheric abundances of some chemical elements. Most of them exhibit strictly periodic light, magnetic, radio, and spectral variations that can be fully explained by a rigidly rotating main-sequence star with persistent surface structures and a stable global magnetic field. Long-term observations of the phase curves of these variations enable us to investigate possible surface differential rotation with unprecedented accuracy and reliability. The analysis of the phase curves in the best-observed mCP stars indicates that the location and the contrast of photometric and spectroscopic spots as well as the geometry of the magnetic field remain constant for at least many decades. The strict periodicity of mCP variables supports the concept that the outer layers of upper-main-sequence stars do not rotate differentially. However, there is a small, inhomogeneous group consisting of a few mCP stars whose rotation periods vary on timescales of decades. The period oscillations may reflect real changes in the angular velocity of outer layers of the stars which are anchored by their global magnetic fields. In CU Vir, V901 Ori, and perhaps BS Cir, the rotational period variation indicates the presence of vertical differential rotation; however, its exact nature has remained elusive until now. The incidence of mCP stars with variable rotational periods is currently investigated using a sample of fifty newly identified Kepler mCP stars.
Links
| GA16-01116S, research and development project |
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