WFRF:(Henry G.W.)
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- Mikulasek, Z.Masaryk Univ, Dept Theoret Phys & Astrophys, Brno, Czech Republic (author)
Differential rotation in magnetic chemically peculiar stars
- Article/chapterEnglish2018
Publisher, publication year, extent ...
- SLOVAK ACADEMY SCIENCES ASTRONOMICAL INST,2018
- electronicrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:uu-357776
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-357776URI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
Classification
Notes
- 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 On, 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.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- stars: chemically peculiar
- stars: rotation
- stars: individual sigma Ori E
- CU Vir
- V901 Ori
- and BS Cir
- space vehicles: Kepler
Added entries (persons, corporate bodies, meetings, titles ...)
- Krticka, J.Masaryk Univ, Dept Theoret Phys & Astrophys, Brno, Czech Republic (author)
- Paunzen, E.Masaryk Univ, Dept Theoret Phys & Astrophys, Brno, Czech Republic (author)
- Svanda, M.Charles Univ Prague, Astron Inst, Prague, Czech Republic (author)
- Hummerich, S.Bundesdeutsch Arbeitsgemeinschaft Veranderliche S, Berlin, Germany (author)
- Bernhard, K.Bundesdeutsch Arbeitsgemeinschaft Veranderliche S, Berlin, Germany (author)
- Jagelka, M.Masaryk Univ, Dept Theoret Phys & Astrophys, Brno, Czech Republic (author)
- Janik, J.Masaryk Univ, Dept Theoret Phys & Astrophys, Brno, Czech Republic (author)
- Henry, G. W.Tennessee State Univ, Ctr Excellence Informat Syst, Nashville, TN 37203 USA (author)
- Shultz, MatthewUppsala universitet,Observationell astrofysik(Swepub:uu)matsh497 (author)
- Masaryk Univ, Dept Theoret Phys & Astrophys, Brno, Czech RepublicCharles Univ Prague, Astron Inst, Prague, Czech Republic (creator_code:org_t)
Related titles
- In:CONTRIBUTIONS OF THE ASTRONOMICAL OBSERVATORY SKALNATE PLESO: SLOVAK ACADEMY SCIENCES ASTRONOMICAL INST48:1, s. 203-2071335-18421336-0337
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- Jagelka, M.
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