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J/ApJ/643/402       Cool white dwarfs in the solar neighborhood   (Kawka+, 2006)

Spectroscopic identification of cool white dwarfs in the solar neighborhood. Kawka A., Vennes S. <Astrophys. J., 643, 402-415 (2006)> =2006ApJ...643..402K
ADC_Keywords: Stars, white dwarf ; Stars, nearby ; Photometry ; Space velocities Keywords: solar neighborhood - stars: atmospheres - white dwarfs Abstract: The New Luyten Two-Tenths catalog contains a large number of high proper motion white dwarf candidates that remain to be spectroscopically confirmed. We present new spectroscopic observations, as well as SDSS archival spectra of 49 white dwarf candidates selected from the revised NLTT catalog of Salim & Gould (2003, Cat. J/ApJ/582/1011). Of these, 34 are cool DA white dwarfs with temperatures ranging from approximately 5000 up to 11,690K, and 11 are DC white dwarfs with temperatures ranging from 4300K (NLTT 18555) up to 11000K. Three of the DA white dwarfs also display abundances of heavy elements (NLTT 3915, NLTT 44986, and NLTT 43806), and one is a cool magnetic white dwarf (NLTT 44447) with an estimated magnetic field strength of 1.3MG. We also present a new cool DQ white dwarf (NLTT 31347) with an estimated temperature of 6250K. We supplement our sample with SDSS ugriz photometry for a fraction of the newly identified white dwarfs. A kinematical study of this sample of white dwarfs, characterized by proper motions ranging from 0.136"/yr to 0.611"/yr, suggest that they belong to the thin disk population. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 83 61 NLTT white dwarfs table2.dat 62 25 SDSS Colors of NLTT White Dwarfs table3.dat 93 61 White Dwarf Parameters and Kinematics
See also: I/98 : NLTT Catalogue (Luyten, 1979) J/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 I5 ---- NLTT NLTT number 7- 35 A29 --- OName Other name(s) 37- 41 F5.3 arcsec/yr pm Total proper motion (1) 43- 47 F5.1 deg pmPA Position angle of proper motion (1) 49- 53 F5.2 mag Vmag V magnitude 55- 58 F4.2 mag e_Vmag rms uncertainty on Vmag 59 A1 --- r_Vmag [a-f] Vmag reference (2) 61- 65 F5.2 mag V-J V-J colour index (3) 67- 70 F4.2 mag e_V-J rms uncertainty on V-J 72- 77 F6.3 mag J-H J-H colour index (3) 79- 83 F5.3 mag e_J-H rms uncertainty on J-H
Note (1): From Salim & Gould, Cat. J/ApJ/582/1011 Note (2): References as follows: a = From Salim & Gould (2003, Cat. J/ApJ/582/1011) c = From SPM Catalog 2.0. (1998, Cat. I/277 d = From Kilkenny et al. (1997, Cat. J/MNRAS/287/867) e = From Eggen (1968ApJS...16...97E) f = From Beers et al. (1992, Cat. J/AJ/103/267) Note (3): from 2MASS magnitudes converted to CIT.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- NLTT NLTT number 7- 25 A19 --- SDSS SDSS name (JHHMMSS.ss+DDMMSS.s) 27- 31 F5.3 mag u-g SDSS u-g colour index 33- 37 F5.3 mag e_u-g rms uncertainty on u-g 39- 43 F5.3 mag g-r SDSS g-r colour index 45- 49 F5.3 mag e_g-r rms uncertainty on g-r 51- 56 F6.3 mag r-i SDSS r-i colour index 58- 62 F5.3 mag e_r-i rms uncertainty on r-i
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 I5 ---- NLTT NLTT number 7- 13 A7 --- Obs Observatories 15- 22 A8 --- WD Other name(s) 23- 25 A3 --- n_WD [abe, ] Note (1) 27- 29 A3 --- SpT Spectral type 31 A1 --- l_Teff [~] Limit flag on Teff 32- 36 I5 K Teff Effective temperature 38- 41 I4 K E_Teff ? Error on Teff (upper limit) 43- 46 I4 K e_Teff ? Error on Teff (lower limit) 47 A1 --- n_Teff [c] Note (1) 49- 52 F4.2 [cm/s2] logg ? Surface gravity 54- 57 F4.2 [cm/s2] e_logg ? rms uncertainty on logg 58 A1 --- n_logg [M] M for Magnetic 59 A1 --- u_logg [)] uncertainty flag on logg 61- 64 F4.2 solMass Mass Mass 66- 69 F4.2 solMass e_Mass ? rms uncertainty on Mass 70 A1 --- u_Mass [)] uncertainty flag on Mass 72 A1 --- l_VMAG [~] Limit flag on VMAG 73- 77 F5.2 mag VMAG Absolute V magnitude 78 A1 --- n_VMAG [d] d: see text for new cool DQ white dwarf NLTT 31347 80- 81 I2 pc Dist Heliocentric estimated distance 83- 85 I3 km/s UVel U space velocity 87- 89 I3 km/s VVel V space velocity 91- 93 I3 km/s WVel W space velocity
Note (1): Note as follows: a = Also in Kawka et al. (2004AJ....127.1702K) b = Also in Vennes & Kawka (2003ApJ...586L..95V) c = Possible binary, Teff estimate from V-J,J-H diagram e = Double degenerate system.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Sep-2008
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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