A Large Catalog of DA White Dwarf Characteristics Using SDSS and Gaia Observations

We present a catalog of 8545 and 19,257 unique DA white dwarfs (WDs) observed in Sloan Digital Sky Survey (SDSS) Data Release 19 and previous SDSS data releases, respectively. This is the largest catalog of both spectroscopic and photometric measurements of DA WDs available to date, and we make this catalog and all codes used to create it publicly available. We measure the apparent radial velocity, spectroscopic effective temperature and surface gravity, and photometric effective temperature and radius for all objects in our catalog. We validate our measurements against other published WD catalogs. For apparent radial velocities, surface gravities, and effective temperatures measured from spectra with signal-to-noise ratios >​ ​​​​​​50, our measurements agree with published SDSS WD catalogs to within 7.5 km s−1, 0.060 dex, and 2.4%, respectively. For radii and effective temperatures measured with Gaia photometry, our measurements agree with other published Gaia data sets to within 0.0005 R⊙ and 3%, respectively. We use this catalog to investigate systematic discrepancies between WDs observed in SDSS-V and previous generations of SDSS. For objects observed in both SDSS-V and previous generations, we uncover systematic differences between measured spectroscopic parameters depending on which set of survey data is used. On average, the measured apparent radial velocity of a DA WD is 11.5 km s−1 larger, and the surface gravity is 0.015 dex smaller when a WD’s spectroscopic parameters are measured using SDSS-V data compared to using data from previous generations of SDSS. These differences may be due to changes in the wavelength solution across survey generations.