SDSSDR10WD - Sloan Digital Sky Survey DR10 New White Dwarf Catalog

Overview

The authors report the discovery of 9,088 new spectroscopically confirmed white dwarfs and subdwarfs in the Sloan Digital Sky Survey (SDSS) Data Release 10 (DR10). They obtain T_eff, log g and masses for hydrogen-atmosphere white dwarf stars (DAs) and helium-atmosphere white dwarf stars (DBs), and estimate the calcium/helium abundances for the white dwarf stars with metallic lines (DZs) and carbon/helium for carbon-dominated spectra (DQs). They found 1 central star of a planetary nebula, 2 new oxygen spectra on helium-atmosphere white dwarfs, 71 DQs, 42 hot DO/PG1159s, 171 white dwarf+main-sequence star binaries, 206 magnetic DAHs, 327 continuum-dominated DCs, 397 metal-polluted white dwarfs, 450 helium-dominated white dwarfs, 647 subdwarfs and 6887 new hydrogen-dominated white dwarf stars.

The targeted white dwarfs were required to be point sources with clean photometry, and to have USNO-B Catalog counterparts (Monet et al.. 2003, AJ, 125, 984, CDS Cat. I/284). They were also restricted to regions inside the DR7 imaging footprint and required to have colors within the ranges g < 19.2, (u-r) < 0.4, -1 < (u-g) < 0.3, -1 < (g-r) < 0.5 and to have low Galactic extinction A_r < 0.5 mag. Additionally, targets that did not have (u-r) < -0.1 and (g-r) < -0.1 were required to have USNO proper motions larger than 2 arcseconds per century (20 milliarcseconds per year). Objects satisfying the selection criteria that had not been observed previously by the SDSS were denoted by the WHITEDWARF_NEW target flag, while those with prior SDSS spectra are assigned the WHITEDWARF_SDSS flag. Some of the latter were re-observed with BOSS in order to obtain the extended wavelength coverage that the BOSS spectrograph offers.

The color selection used includes DA stars with temperatures above ~14,000 K, helium-atmosphere white dwarfs above ~8000 K, as well as many rarer classes of white dwarfs. Hot subdwarfs (sdB and sdO) were targeted as well. Note that this catalog does not include stars from the earlier SDSS white dwarf catalogs, e.g., Eisenstein et al. (2006, ApJS, 167, 40, available in the HEASARC database as the SDSSDWDSD table), Kleinman et al. (2013, ApJS, 205, 5, available in the HEASARC database as the SDSSDR7WD table)..

Catalog Bibcode

2015MNRAS.446.4078K

References

.New white dwarf stars in the Sloan Digital Sky Survey Data Release 10.
    Kepler S.O., Pelisoli I., Koester D., Ourique G., Kleinman S.J.,
    Romero A.D., Nitta A., Eisenstein D.J., Costa J.E.S., Kulebi B., Jordan S.,
    Dufour P., Giommi P., Rebassa-mansergas A.
   <Mon. Not. R. Astron. Soc., 446, 4078-4087 (2015)>
   =2015MNRAS.446.4078K    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in October 2017 based on an electronic version of Table 6 from the reference paper which was obtained from the CDS as their catalog J/MNRAS/446/4078 file table6.dat.

Parameters

Name
The standard SDSS source name, being a J2000.0 position-based source designation registered with the CDS Dictionary of Nomenclature of Celestial Objects, viz., 'SDSS JHHMMSS.ss+DDMMSS.ss'.

Plate_Number
The SDSS spectroscopic plate number.

Spectrum_Date
The date of the SDSS spectroscopic observation for the white dwarf.

Fiber_Number
The fiber number of the SDSS spectroscopic observation for the white dwarf.

RA
The Right Ascension of the white dwarf in the selected equinox. This was not given explicitly in the original table, but was constructed by the HEASARC from the position-based source name in which the J2000.0 RA is specified to a precision of 0.01 seconds of time.

Dec
The Declination of the white dwarf in the selected equinox. This was not given explicitly in the original table, but was constructed by the HEASARC from the position-based source name in which the J2000.0 Dec is specified to a precision of 0.01 arcseconds.

LII
The Galactic Longitude of the white dwarf.

BII
The Galactic Latitude of the white dwarf.

Gmag_SNR
The SDSS g-band signal-to-noise ratio of the white dwarf.

Umag
The SDSS u-band PSF magnitude of the white dwarf.

Umag_Error
The RMS uncertainty in the SDSS u-band PSF magnitude of the white dwarf.

Gmag
The SDSS g-band PSF magnitude of the white dwarf.

Gmag_Error
The RMS uncertainty in the SDSS g-band PSF magnitude of the white dwarf.

Rmag
The SDSS r-band PSF magnitude of the white dwarf.

Rmag_Error
The RMS uncertainty in the SDSS r-band PSF magnitude of the white dwarf.

Imag
The SDSS i-band PSF magnitude of the white dwarf.

Imag_Error
The RMS uncertainty in the SDSS i-band PSF magnitude of the white dwarf.

Zmag
The SDSS z-band PSF magnitude of the white dwarf.

Zmag_Error
The RMS uncertainty in the SDSS z-band PSF magnitude of the white dwarf.

PM_Tot
The SDSS proper motion of the white dwarf, in mas/year. This was converted by the HEASARC from the units of arcsec/century (0.01 arcsec/yr) used in the original version.

T_Eff
The autofit effective temperature of the white dwarf, T_eff, in Kelvin.

T_Eff_Error
The RMS uncertainty in the autofit effective temperature of the white dwarf, T_eff, in Kelvin.

Log_G
The autofit logarithm of the surface gravity of the white dwarf, log g, in cm s^-2.

Log_G_Error
The RMS uncertainty in the autofit logarithm of the surface gravity of the white dwarf, log g, in cm s^-2. When the value of this field is 0.000, the authors have assumed log g = 8.0, and did not fit the surface gravity.

Spect_Type
The 'human' classification of the source spectral type.

T_Eff_3D
The temperatures and surface gravities were corrected to the three-dimensional convection models of Tremblay et al. (2013, A&A, 559, A104). For sources with pure DA and DB spectral types, this field contains the 3D-corrected effective temperature of the white dwarf, T_eff, in Kelvin.

T_Eff_3D_Error
The RMS uncertainty in the 3D-corrected effective temperature of the white dwarf, T_eff, in Kelvin.

Log_G_3D
The temperatures and surface gravities were corrected to the three-dimensional convection models of Tremblay et al. (2013, A&A, 559, A104). This field contains the 3D-corrected logarithm of the surface gravity of the white dwarf, log g, in cm s^-2.

Log_G_3D_Error
The RMS uncertainty in the logarithm of the 3D-corrected logarithm of the surface gravity of the white dwarf, log g, in cm s^-2.

Mass
The calculated mass of the white dwarf, in solar masses, given for clean DAs and DBs only. This is calculated as described on Section 4.3 of the reference paper.

Mass_Error
The RMS uncertainty in the calculated mass of the white dwarf, in solar masses.

Comments
Comments about the SDSS source. For sources with DZ spectral type, this field contains the ratio of the Ca-to-He abundances, in the form of -log(Ca/He). For sources with DQ spectral type, this field contains the radio of the C-to-He abundances, in the form of -log(C/He).

Class
The HEASARC Browse object classification, based on the 'human' spectral type classification (the spect_type parameter value).

Contact Person

Questions regarding the SDSSDR10WD database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:34:37 EDT