VizieR Online Data Catalog: GALEX absolute calibration based on white dwarfs (Wall+, 2019)

In order to improve calibrations for the GALEX data, we select all spectroscopically confirmed DA white dwarfs from the SDSS data releases 7, 10, and 12 with S/N>=20 spectra (Kleinman et al. 2013ApJS..204....5K, Cat. J/ApJS/204/5; Kepler et al. 2015MNRAS.446.4078K, Cat. J/MNRAS/446/4078, 2016MNRAS.455.3413K, Cat. J/MNRAS/455/3413).

We cross-reference our initial sample of 3733 DA white dwarfs from the SDSS with Panoramic Survey Telescope and Rapid Response System (Pan-STARRS), and we cross-reference our sample once more with Gaia Data Release (DR2) (Gaia Collaboration, 2018A&A...616A...1G, Cat. I/345), selecting all stars with parallax/error>=5. We then cross-reference our sample with the GALEX catalogue of unique UV sources from the AIS (GUVcat) presented in Bianchi, Shiao & Thilker (2017ApJS..230...24B, Cat. II/335). We use a search radius of 2 arcsec and find a total of 1837 stars with GALEX photometry.

We break our initial sample of stars into two groups based on Gaia distance: stars within 100 pc and stars further than 250 pc. There are 339 (627) and 451 (628) stars with FUV and NUV photometry in the 100 (d>250) pc sample, respectively. We leave the examination of stars between 100 and 250 pc for future work.

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