The nature of light variations in magnetic hot stars

Krticka, J.Masaryk Univ, Dept Theoret Phys & Astrophys, CZ-61137 Brno, Czech Republic (författare)

Magnetic stars show several types of light variability which is modulated by the stellar rotation. In chemically peculiar stars, the redistribution of the flux in the surface regions with peculiar chemical composition leads to the light variability with a typical amplitude of the order of hundredths of magnitude. The most efficient processes that cause the flux redistribution are bound-bound (line) transitions of iron and bound-free (ionization) transitions of silicon. This type of light variability typically leads to a complex dependence of the amplitude on the wavelength and shows antiphase light curves in the far ultraviolet and visual regions. In hot magnetic stars, the modulation of the stellar wind by the magnetic field and the wind blanketing cause the light variability with a typical amplitude of the order of millimagnitudes. We predict the light variations in selected magnetic hot stars and compare the simulated light curves with light variations derived from observations.

Huang, L.Royal Mil Coll Canada, Dept Phys, POB 17000, Kingston, ON K7K 7B4, Canada (författare)
Jagelka, M.Masaryk Univ, Dept Theoret Phys & Astrophys, CZ-61137 Brno, Czech Republic (författare)
Lüftinger, T.Univ Wien, Inst Astron, A-1180 Vienna, Austria (författare)
Mikulasek, Z.Masaryk Univ, Dept Theoret Phys & Astrophys, CZ-61137 Brno, Czech Republic (författare)
Niemczura, E.Wroclaw Univ, Astron Inst, PL-51622 Wroclaw, Poland (författare)
Prvak, M.Masaryk Univ, Dept Theoret Phys & Astrophys, CZ-61137 Brno, Czech Republic (författare)
Silvester, JamesUppsala universitet,Observationell astrofysik(Swepub:uu)jamsi978 (författare)
Wade, G.Royal Mil Coll Canada, Dept Phys, POB 17000, Kingston, ON K7K 7B4, Canada (författare)
Masaryk Univ, Dept Theoret Phys & Astrophys, CZ-61137 Brno, Czech RepublicRoyal Mil Coll Canada, Dept Phys, POB 17000, Kingston, ON K7K 7B4, Canada (creator_code:org_t)

Ingår i:CONTRIBUTIONS OF THE ASTRONOMICAL OBSERVATORY SKALNATE PLESO: SLOVAK ACADEMY SCIENCES ASTRONOMICAL INST48:1, s. 170-1741335-1842

Av författaren/redakt...: Krticka, J.; Huang, L.; Jagelka, M.; Lüftinger, T.; Mikulasek, Z.; Niemczura, E.; visa fler...; Prvak, M.; Silvester, James; Wade, G.; visa färre...

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