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Our search focuses on the study of the spectral energy distribution (SED) of 3,733 white dwarfs with reliable infrared photometry and GBP-GRP colours below 0.8 mag, a sample which seems to be nearly. We require targets to be point sources with clean u, g, and r photometry (following the clean point source selection from the DR7 documentation), and USNO counterparts. We analyse the 100pc Gaia white dwarf volume-limited sample by means of VOSA (Virtual Observatory SED Analyser) with the aim of identifying candidates for displaying infrared excesses.
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Importantly, the BOSS spectral range extends further into the UV, allowing full coverage of the Balmer lines. This BOSS ancillary targeting program relaxes this requirement and imposes color cuts to focus on warm and hot white dwarfs. However, much of SDSS white dwarf targeting required that the objects be unblended, which caused many brighter white dwarfs to be skipped (for a detailed discussion, see Section 5.6 of Eisenstein et al. Special target classes in SDSS produced the world’s largest spectroscopic samples of white dwarfs ( Kleinman et al. SDSS multi-color imaging efficiently distinguishes hot white dwarf and subdwarf stars from the bulk of the stellar and quasar loci in color-color space ( Harris et al. This ancillary target program measured spectra of thousands of white dwarfs that were missed by prior SDSS spectroscopic surveys. However, target selection considerations of the original SDSS meant that white dwarf selection was incomplete. The original SDSS data massively increased the number of known white dwarfs, which had an enormous impact on the science of these stars. White dwarf candidate with a pre-existing SDSS spectrum White dwarf candidate whose spectrum had not been observed previously by the SDSS Note the caveat regarding observations of these targets on some early BOSS plates Program (bit name)
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See SDSS bitmasks to learn how to use these values to identify objects in this ancillary target program. Harvard-Smithsonian Center for of white dwarf candidates in the SDSS Data Release 7 imaging area (7,430 deg 2) Finding TargetsĪn object whose ANCILLARY_TARGET1 value includes one or more of the bitmasks in the following table was targeted for spectroscopy as part of this ancillary target program.