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The total mass of the close, double degenerate (DA+DQ) system NLTT~16249
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We revisit the binary and stellar properties of the double-degenerate system NLTT 16249. An analysis of new echelle spectra, supported by a joint study of a DQZ velocity template NLTT 44303, confirms the orbital period and constrains the mass ratio revealing a carbon-polluted DQ white dwarf that is up to ~6 percent more massive than its hydrogen-rich DA companion. Our new model atmosphere analysis of the DA and DQ components, constrained by an accurate Gaia parallax measurement that places the binary at a distance of 57.8 pc, reveals lower mass and temperature than previously estimated for both components, but with higher carbon and nitrogen abundances in the DQ atmosphere. The two components are nearly coeval and could have been generated following a single common envelope event.
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Double White Dwarf Binaries in SDSS-V DR19 : The discovery of a rare DA+DQ white dwarf binary with 31 hour orbital period
SDSS J0906+0223 is a newly discovered DA+DQ double white dwarf binary with a best-fit 31.17 hour period, masses of 0.42 and 0.49 solar masses, and a proposed Algol-type formation history.
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