Researchers investigate properties of double whitedwarfs with new masstransfer stability criterion AandA_journal
. The more massive one fills its Roche lobe close to the end of HG. The mass transfer at the beginning is stable since the critical mass ratio of an HG star for both models is very large . However, when about 0.4 material is lost, the donor climbs upward along the giant branch in the later evolutionary phase due to the residue hydrogen-rich envelope. At this moment, the binary encompasses a donor of 3.29 .
Distribution of the initial primary mass and initial binary separation of binaries that produce DWDs. Left and right panels are for Ge’s and polytropic models, respectively. The dotted lines represent the minimum separation for which the primary fills its Roche lobe at a certain evolutionary stage, as indicated in the panels. Abbreviations are the same as in Fig.
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