WD1-3 - (WD1) The Status of Magnetic White Dwarfs - (WD3) White Dwarfs in Binaries and the Role of Gravitational Waves |
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Speaker |
Otoniel da Silva, Edson |
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Coauthors |
E. Otoniel; F. Weber; M. Malheiro |
| Talk Title |
Effect of rotation in magnetic White dwarf |
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Abstract |
Recently, it has been suggested that strongly magnetized white dwarfs (SMWDs)with masses greater than the Chandrasekhar mass limit of 1.4 solar masses maybe the progenitors of overluminous type-Ia supernovae [1]. This interpretation requires a detailed understanding of the properties of such objects, which is the subject of this paper. The properties of magnetic white dwarfs are computed for an equation of state which describes white dwarf matter in terms of a regular crystal lattice of atomic nuclei at zero temperature, immersed in a totally magnetized electron gas [2]. The minimum critical densities at which electron capture reactions and possibly pycnonuclear fusion reactions occur inside of rotating white dwarfs are studied for different magnetic fields and stellar rotation rates. Moreover we calculate the mass-radius relationships of magnetic white dwarfs for magnetic fields ranging from zero up to 10 13 Gauss and rotational stellar frequencies between zero and the Kepler frequency, which sets an absolute limit on rapid rotation.. Our results show that the presence of strong magnetic fields in white dwarfs decreases the value of the critical density for the onset of electron capture. We also find that rotating magnetized white dwarfs may be up to one hundred times less dense than ordinary white dwarfs, depending on their rate of rotation. |
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