ANALYZING THE LOW STATE OF EF ERIDANI WITH HUBBLE SPACE TELESCOPE ULTRAVIOLET SPECTRA

作者：Szkody Paula^*; Mukadam Anjum; Gaensicke Boris T; Campbell Ryan K; Harrison Thomas E; Howell Steve B; Holtzman Jon; Walter Frederick M; Henden Arne; Dillon William; Boberg Owen; Dealaman Shannon; Perone Christian S

来源：Astrophysical Journal, 2010, 716(2): 1531-1540.

DOI：10.1088/0004-637X/716/2/1531

• binaries: close
• novae, cataclysmic variables
• stars: individual (EF Eri)
• ultraviolet: stars

Time-resolved spectra throughout the orbit of EF Eri during its low accretion state were obtained with the solar blind channel on the Advanced Camera for Surveys on board the Hubble Space Telescope. The overall spectral distribution exhibits peaks at 1500 and 1700 angstrom, while the UV light curves display a quasi-sinusoidal modulation over the binary orbit. Models of white dwarfs (WDs) with a hot spot and cyclotron emission were attempted to fit the spectral variations throughout the orbit. A non-magnetic WD with a temperature of similar to 10,000 K and a hot spot with a central temperature of 15,000 K generally match the broad absorptions at 1400 and 1600 angstrom with those expected for the quasi-molecular H features H(2) and H(2)(+). However, the flux in the core of the Ly alpha absorption does not go to zero, implying an additional component, and the flux variations throughout the orbit are not well matched at long wavelengths. Alternatively, a 9500 K WD with a 100 MG cyclotron component can fit the lowest (phase 0.0) fluxes, but the highest fluxes (phase 0.5) require an additional source of magnetic field or temperature. The 100 MG field required for the UV fit is much higher than that which fits the optical/IR wavelengths, which would support previous suggestions of a complex field structure in polars.

• 出版日期2010-6-20