Nova 1670 (CK Vulpeculae) was a merger of a red giant with a helium white dwarf

Open Access

Fig. 2.

Schematic illustration of the proposed scenario of a merger between an RGB star with a HeWD, and of its product. The relative sizes of the internal substructures of the stars are not to scale. Pink regions show H-rich matter; dark green represents He-rich gas; light green shows the thin ²⁶Al layer; and blue depicts the He core of the WD.

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