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J/AJ/146/34   Infrared photometry of DA white dwarfs from LAMOST  (Zhang+, 2013)

DA white dwarfs observed in the LAMOST pilot survey. Zhang Y.-Y., Deng L.-C., Liu C., Lepine S., Newberg H.J., Carlin J.L., Carrell K., Yang F., Gao S., Xu Y., Li J., Zhang H.-T., Zhao Y.-H., Luo A.-L., Bai Z.-R., Yuan H.-L., Jin G. <Astron. J., 146, 34 (2013)> =2013AJ....146...34Z
ADC_Keywords: Stars, white dwarf ; Photometry, ugriz ; Photometry, infrared Keywords: atlases - catalogs - surveys - white dwarfs Abstract: A total of ∼640000 objects from the LAMOST pilot survey have been publicly released. In this work, we present a catalog of DA white dwarfs (DAWDs) from the entire pilot survey. We outline a new algorithm for the selection of white dwarfs (WDs) by fitting Sersic profiles to the Balmer Hβ, Hγ, and Hδ lines of the spectra, and calculating the equivalent width of the CaII K line. Two thousand nine hundred sixty-four candidates are selected by constraining the fitting parameters and the equivalent width of the CaII K line. All the spectra of candidates are visually inspected. We identify 230 DAWDs (59 of which are already included in the Villanova and SDSS WD catalogs), 20 of which are DAWDs with non-degenerate companions. In addition, 128 candidates are classified as DAWDs/subdwarfs, which means the classifications are ambiguous. The result is consistent with the expected DAWD number estimated based on the LEGUE target selection algorithm. Description: A total of ∼640000 objects from the LAMOST pilot survey have recently been released (Luo et al., 2012RAA....12.1243L). Here, we report on 230 spectroscopically identified DA white dwarfs from the LAMOST pilot survey. In addition, 128 candidates are classified as DA white dwarfs/subdwarfs. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 121 358 Identified DA white dwarfs and DA white dwarf/subdwarf targets in LAMOST pilot survey
See also: V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) I/322 : UCAC4 Catalogue (Zacharias+, 2012) III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) II/207 : Palomar-Green catalog UV-excess stellar objects (Green+ 1986) J/AJ/145/159 : LAMOST. II. ugriz photometry of 526 new quasars (Huo+, 2013) J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013) J/AJ/142/112 : KIC photometric calibration (Brown+, 2011) J/AJ/135/1239 : Spectral distances to DA white dwarfs (Holberg+, 2008) J/AJ/132/1221 : VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/358] Sequence number in the catalog 5- 23 A19 --- LAMOST LAMOST identifier (JHHMMSS.ss+DDMMSS.s) 25- 29 F5.2 mag umag ? SDSS u band magnitude (1) 31- 35 F5.2 mag gmag ? SDSS g band magnitude (1) 37- 41 F5.2 mag rmag ? SDSS r band magnitude (1) 43- 47 F5.2 mag imag ? SDSS i band magnitude (1) 49- 53 F5.2 mag Jmag ? 2MASS J band magnitude (from cat. II/246) 55- 59 F5.2 mag Hmag ? 2MASS H band magnitude (from cat. II/246) 61- 65 F5.2 mag Kmag ? 2MASS Ks band magnitude (from cat. II/246) 67- 71 F5.2 mag Bmag ? UCAC3 B band magnitude (2) 73- 77 F5.2 mag Rmag ? UCAC3 R band magnitude (2) 79- 83 F5.2 mag Imag ? UCAC3 I band magnitude (2) 85- 89 F5.2 mag Vmag ? Hipparcos V magnitude (from cat. I/239) 90 A1 --- f_Vmag [k] Kp magnitude instead of V magnitude (3) 92- 98 F7.2 km/s RV ? Elodie radial velocity 100-115 A16 --- Class DA white dwarf classification (4) 117 A1 --- f_Class [e] Emission lines shown in a spectrum 119-121 A3 --- n_LAMOST DA white dwarf in other catalogs (v=Villanova, s=SDSS DR7 white dwarf) (5)
Note (1): Come from SDSS photometry or Xuyi survey. Note (2): From the UCAC3 catalog (Zacharias et al., 2009, cat. I/315; obsoleted by Zacharias et al. 2012, cat. I/322). Note (3): k = Kp magnitude from Kepler Input Catalog (Brown et al., 2011, cat. J/AJ/142/112, and V/133) is presented instead of V magnitude. Note (4): According to Sion et al. (1983ApJ...269..253S), the classification consists of two parts, the "DA" type and the subtype index which is a temperature index corresponding to 50,400/T. This temperature index is determined by visually comparing the target spectrum with spectra of different temperature indices in the atlas of Wesemael et al. (1993PASP..105..761W) and the SDSS DR4 WD catalog (Eisenstein et al. 2006, cat. J/ApJS/167/40). A DA white dwarf with a companion is denoted as "DA+companion." If the spectral type of the companion is identifiable, i.e., an M star, the classification is "DA+M." A colon means the identification is uncertain. The DA white dwarf/subdwarf targets are classified as "DA:/SD."Note (5): Other catalogs as follows: Note (5): Other catalogs as follows: v = a DA white dwarf is in Villanova white dwarf catalog (McCook & Sion, 2008, cat. III/235); s = a DA white dwarf is in SDSS DR7 white dwarf catalog (Kleinman et al., 2013, cat. J/ApJS/204/5).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 10-Jun-2014
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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