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Examen des stratégies doptions binaires,

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    There are several progenitor models for SNe Ia proposed in the past years. According to these calculations, we mapped out the initial and final parameters for SNe Ia in the orbital period-secondary mass log P i - M i 2 plane for various WD masses for this channel.

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    We discussed the influence of the variation of the duty cycle value on the regions for producing SNe Ia. Similar to previous studies, this work also indicates that the long-period dwarf novae offer possible ways for producing SNe Ia.

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    Meanwhile, we find that the surviving companion stars from this channel have a low mass after the SN explosion, which may provide a means for the formation of the population of single low-mass WDs o-dot. We adapt a standard method of stellar typing to our measurement of the shape of the Balmer ϵ absorption line to demonstrate that USNO-A is a blue Examen des stratégies doptions binaires branch star, residing in the lower stellar halo at a distance of 4.

    We measure the H and K lines of singly ionized calcium and find two isolated velocity components, one originating in the disk, and one associated with the high-velocity cloud complex WD. We find that complex WD is not in corotation with the Galactic disk, which has been assumed for decades.

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    We examine a number of scenarios and find that the most likely scenario is that complex WD was ejected from the solar neighborhood and is only a few kiloparsecs from the Sun.