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J/AJ/128/1825    Photometry identification of cool white dwarfs   (Kilic+, 2004)

Photometric identification of cool white dwarfs. Kilic M., Winget D.E., von Hippel T., Claver C.F. <Astron. J., 128, 1825-1833 (2004)> =2004AJ....128.1825K
ADC_Keywords: Photometry, ugriz ; Stars, white dwarf Keywords: stars: evolution - white dwarfs Abstract: We investigate the use of a narrowband DDO51 filter for photometric identification of cool white dwarfs. We report photometric observations of 30 known cool white dwarfs with temperatures ranging from 10,000K down to very cool temperatures (≤3500K). Follow-up spectroscopic observations of a sample of objects selected using this filter and our photometric observations show that DDO51 filter photometry can help select cool white dwarf candidates for follow-up multiobject spectroscopy by rejecting 65% of main-sequence stars with the same broadband colors as the cool white dwarfs. This technique is not selective enough to efficiently feed single-object spectrographs. We present the white dwarf cooling sequence using this filter. Our observations show that very cool white dwarfs form a sequence in the r-DDO versus r-z color-color diagram and demonstrate that significant improvements are needed in white dwarf model atmospheres. Description: Follow-up spectroscopy of nine white dwarf candidates in the Spaghetti Survey field was obtained in 2002 April and May using the HET (Hobby-Eberly Telescope) and in 2003 February using the McDonald 2.7m Harlan-Smith Telescope. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 125 40 Objects with SDSS Spectroscopy table2.dat 105 9 Objects with HET+McDonald 2.7Meter Spectroscopy table3.dat 67 30 DDO51 Photometry for Previously Identified White Dwarfs
See also: III/70 : Luyten's White Dwarf Catalogues (Luyten, 1970-77) III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2003) J/AJ/126/1023 : White Dwarfs in the SDSS (Harris+, 2003) J/ApJ/607/426 : Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004) J/ApJS/133/413 : BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 6- 24 A19 --- SDSS SDSS designation (JHHMMSS.ss+DDMMSS.s) 27- 29 I3 --- Plate Plate 31- 37 I7 d Date Julian date of observation 39- 41 I3 --- Fiber Fiber 44- 48 F5.2 mag DDOmag Magnesium absorption line centered filter DDO51 51- 55 F5.2 mag umag u SDSS magnitude 58- 62 F5.2 mag gmag g SDSS magnitude 65- 69 F5.2 mag rmag r SDSS magnitude 72- 76 F5.2 mag imag i SDSS magnitude 79- 83 F5.2 mag zmag z SDSS magnitude 86- 89 F4.2 mag e_DDOmag Error in DDOmag 92- 95 F4.2 mag e_umag Error in umag 98-101 F4.2 mag e_gmag Error in gmag 104-107 F4.2 mag e_rmag Error in rmag 110-113 F4.2 mag e_imag Error in imag 116-119 F4.2 mag e_zmag Error in zmag 122-125 A4 --- Type Object type
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1 I1 --- Seq Sequential number 4- 7 A4 --- --- [SDSS] 9- 27 A19 --- SDSS SDSS designation (JHHMMSS.ss+DDMMSS.s) 30- 34 F5.2 mag DDOmag Magnesium absorption line centered filter DDO51 37- 41 F5.2 mag umag u SDSS magnitude 44- 48 F5.2 mag gmag g SDSS magnitude 51- 55 F5.2 mag rmag r SDSS magnitude 58- 62 F5.2 mag imag i SDSS magnitude 65- 69 F5.2 mag zmag z SDSS magnitude 72- 75 F4.2 mag e_DDOmag Error in DDOmag 78- 81 F4.2 mag e_umag Error in umag 84- 87 F4.2 mag e_gmag Error in gmag 90- 93 F4.2 mag e_rmag Error in rmag 96- 99 F4.2 mag e_imag Error in imag 102-105 F4.2 mag e_zmag Error in zmag
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 24 A24 --- Name Object name 27- 31 F5.2 mag Rmag Cousins R magnitude 34- 38 F5.2 mag r-z SDSS r-z colour index 41- 44 F4.2 mag e_r-z Error in r-z 47- 51 F5.2 mag r-DDO r-DDO51 colour index 54- 57 F4.2 mag e_r-DDO Error in r-DDO 60- 64 I5 K Teff ? Effective temperature 65 A1 --- f_Teff [:] Flag on Teff 67 I1 --- Note Individual Note (1)
Note (1): Note is defined as follows: 1 = R magnitude and Teff from Bergeron et al. (1997ApJS..108..339B) 2 = Spectral type DBQA5 (Wesemeal et al. 1993PASP..105..761W) 3 = R magnitude and Teff from Ruiz & Bergeron (2001ApJ...558..761R) 4 = R magnitude and Teff from Bergeron et al. 2001, Cat. J/ApJS/133/413 5 = R59F magnitude and/or Teff from Oppenheimer et al. (2001Sci...292..698O) 6 = SDSS (Cat.J/AJ/126/2579) r magnitude
History: From electronic version of the journal
(End) Marianne Brouty [CDS] 13-Apr-2005
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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