Census of blue stars in SDSS DR8

Abstract

We present a census of the 12,060 spectra of blue objects ($(g-r{)}_0<-0.25$) in the Sloan Digital Sky Survey (SDSS) Data Release 8 (DR8). As part of the data release, all of the spectra were cross-correlated with 48 template spectra of stars, galaxies and QSOs to determine the best match. We compared the blue spectra by eye to the templates assigned in SDSS DR8. 10,856 of the objects matched their assigned template, 170 could not be classified due to low signal-to-noise (S/N), and 1034 were given new classifications. We identify 7458 DA white dwarfs, 1145 DB white dwarfs, 273 rarer white dwarfs (including carbon, DZ, DQ, and magnetic), 294 subdwarf O stars, 648 subdwarf B stars, 679 blue horizontal branch stars, 1026 blue stragglers, 13 cataclysmic variables, 129 white dwarf - M dwarf binaries, 36 objects with spectra similar to DO white dwarfs, 179 QSOs, and 10 galaxies. We provide two tables of these objects, sample spectra that match the templates, figures showing all of the spectra that were grouped by eye, and diagnostic plots that show the positions, colors, apparent magnitudes, proper motions, etc. for each classification. Future surveys will be able to use templates similar to stars in each of the classes we identify to classify blue stars, including rare types, automatically.

arXiv comment65 pages, 28 figures; full data tables, online-only figure sets, and data behind the figures are not included in this version; accepted to ApJSuppl

References in corpus (17)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Sloan Digital Sky Survey: Technical Summary
• The Eighth Data Release of the Sloan Digital Sky Survey: First Data from SDSS-III
• SEGUE: A Spectroscopic Survey of 240,000 stars with g=14-20
• The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
• A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• Identification of A-colored Stars and Structure in the Halo of the Milky Way from SDSS Commissioning Data
• The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters
• The Discovery of a Field Methane Dwarf from Sloan Digital Sky Survey Commissioning Data
• On the Spectral Evolution of Cool, Helium-Atmosphere White Dwarfs: Detailed Spectroscopic and Photometric Analysis of DZ Stars
• The SEGUE Stellar Parameter Pipeline. IV. Validation with an Extended Sample of Galactic Globular and Open Clusters
• Color Confirmation of Asteroid Families
• An Initial Survey of White Dwarfs in the Sloan Digital Sky Survey
• Cataclysmic Variables from SDSS. VIII. The Final Year (2007-2008)
• A Spectroscopic and Photometric Survey of Novae in M31
• The Recognition of Unusual Objects in the Sloan Digital Sky Survey Color System
• Spectroscopy of New and Poorly Known Cataclysmic Variables in the Kepler Field

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