A STUDY OF THE PHOTOMETRIC VARIABILITY OF THE PECULIAR MAGNETIC WHITE DWARF WD1953-011

作者：Valyavin G^*; Antonyuk K; Plachinda S; Clark D M; Wade G A; Machado Lester Fox; Alvarez M; Lopez J M; Hiriart D; Han Inwoo; Jeon Young Beom; Bagnulo S; Zharikov S V; Zurita C; Mujica R; Shulyak D; Burlakova T

来源：Astrophysical Journal, 2011, 734(1): 17.

DOI：10.1088/0004-637X/734/1/17

• stars: magnetic field
• white dwarfs

We present and interpret simultaneous new photometric and spectroscopic observations of the peculiar magnetic white dwarf WD 1953-011. The flux in the V-band filter and intensity of the Balmer spectral lines demonstrate variability with the rotation period of about 1.45 days. According to previous studies, this variability can be explained by the presence of a dark spot having a magnetic nature, analogous to a sunspot. Motivated by this idea, we examine possible physical relationships between the suggested dark spot and the strong-field magnetic structure (magnetic "spot" or "tube") recently identified on the surface of this star. Comparing the rotationally modulated flux with the variable spectral observables related to the magnetic "spot," we establish their correlation and therefore their physical relationship. Modeling the variable photometric flux assuming that it is associated with temperature variations in the stellar photosphere, we argue that the strong-field area and dark, low-temperature spot are comparable in size and located at the same latitudes, essentially overlapping each other with a possible slight longitudinal shift. In this paper, we also present a new, improved value of the star's rotational period and constrain the characteristics of the thermal inhomogeneity over the degenerate's surface.

• 出版日期2011-6-10