Spectrophotometric variability of the magnetic CP star 56 Arietis in spectral region from 1950 to 3200 A - Astrophysics > Solar and Stellar AstrophysicsReportar como inadecuado




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Abstract: The spectrophotometric variability of the magnetic CP star 56 Arietis 56Ari in the ultraviolet spectral region from 1950 to 3200 A is investigated.This study is based on the archival International Ultraviolet Explorer dataobtained at different phases of the rotational cycle. The brightness of 56 Ariis not constant in the investigated wavelengths over the whole rotationalperiod. The monochromatic light curves continuously change their shape withwavelength. This indicates that we do not observe a truly -null wavelengthregion- where the monochromatic light curve has a zero amplitude. Probably, anuneven surface distribution of silicon and iron mainly influences the fluxredistribution from the far-UV to near-UV spectral regions, although additionalsources of opacity may be involved. The redistribution of the flux at phase0.25 is connected with the nonuniform distribution of silicon on the stellarsurface of 56 Ari. On the other hand, the redistribution of the flux at phase0.65 is quite complex, because there are additional blocking and redistributionof the flux by iron lines in the near-UV spectral region.



Autor: Nikolay A. Sokolov

Fuente: https://arxiv.org/







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