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Figure 1: Total luminosity ( left panel) and envelope mass ( right panel) versus effective temperature for our white dwarf envelope models: ONe75 (dotted line), ONe50 (short dash), ONe25 (long dash), and CO50 (short dash-dot). Effective temperature is given in eV, Solid lines indicate envelopes without convective regions. Five series of models are plotted for each chemical composition, corresponding to total masses 0.9, 1.0, 1.1, 1.2, and 1.3 . A line indicating the luminosity-effective temperature relation for constant photospheric radius is over-plotted in left panel for comparison.

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In the text

	Figure 2: Envelope mass versus base temperature for CO50 models. Solid lines indicate envelopes without convective regions.
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In the text

Figure 3: Internal structure of ONe50 (dashed line) and CO50 (dotted line) envelopes with core masses 0.9, 1.0, 1.1, 1.2, and 1.3 , all of them with a similar effective temperature,  K (40 eV). Photospheric radii are, for ONe50 models, between  cm for 0.9  and  cm for 1.3 ; and for CO50 models between  cm for 0.9 and  cm for 1.3 . Solid (ONe50) and dash-dotted (CO50) lines indicate convective zones.

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In the text

Figure 4: Internal structure of four envelope models with the same core mass (1.1 ) and similar luminosity ( ), but with different chemical compositions: CO50 with photospheric radius  cm (dash dotted line), ONe25 with  cm (long-dashed line), ONe50 with  cm (short-dashed line), and ONe75 with  cm (dotted line). A solid line indicates convection regions, and the atmosphere is plotted with dotted line for all cases.

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In the text

Figure 5: Internal structure of some ONe white dwarf envelope models with different white dwarf masses and composition and with the same luminosity,  , and effective temperature,  K (45 eV). Three models belong to the high luminosity branch, all three with the same total luminosity: ONe25 with (long dash-dotted line), ONe50 with (short dash-dotted line), and ONe75 with (short dashed line). All of them have photospheric radius,  cm. A fourth model from the low luminosity branch, but with the same effective temperature, is also plotted (ONe50 with , and  cm, long-dashed line). Solid lines indicate convective zones, and atmospheres are plotted with dotted lines.

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In the text

	Figure 6: Plateau luminosity versus core mass ( left) and hydrogen mass fraction ( right). Crosses indicate ONe envelope models results, while open dots correspond to CO50 models. Dashed lines correspond to Eq. (1) for ONe models, and the dotted line in the left panel to Eq. (2) for CO50 models.
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In the text

	Figure 7: Maximum effective temperature versus core mass ( left) and hydrogen mass fraction ( right) for the same models shown in Fig. 6. Lines joining points are for orientation purposes.
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In the text

	Figure 8: Maximum envelope mass versus core mass ( left) and hydrogen mass fraction ( right) for the same models shown in Fig. 6. Equation (3) is shown in dashed lines.
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In the text

	Figure 9: Minimum envelope mass versus total mass ( left) and hydrogen mass fraction ( right) for the same models shown in Fig. 6. The minimum envelope mass only slightly depends on the hydrogen mass fraction, resulting in very similar values for models with different compositions (overplotted points for ONe75, ONe50, and CO50 models in left panel). Dashed lines correspond to Eq. (4).
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In the text

	Figure 10: Luminosity versus effective temperature for the high luminosity branch of CO50 and ONe50 envelopes. Time in days needed for the envelope to evolve between two adjacent ticks is indicated.
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In the text

	Figure 11: Same as Fig. 10 for ONe25 and ONe75 envelope models.
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In the text