J/A+A/448/579 Sample of confirmed WDs in GSC-II survey (Carollo+, 2006)
The GSC-II-based survey of ancient cool white dwarfs.
I. The sample of spectroscopically confirmed WDs.
Carollo D., Bucciarelli B., Hodgkin S.T., Lattanzi M.G., McLean B.,
Morbidelli R., Smart R.L., Spagna A., Terranegra L.
<Astron. Astrophys. 448, 579 (2006)>
=2006A&A...448..579C 2006A&A...448..579C
ADC_Keywords: Surveys ; Stars, white dwarf ; Proper motions ; Photometry
Keywords: stars: white dwarfs - astrometry - techniques: spectroscopic - surveys
Abstract:
The GSC-II white dwarf survey was designed to identify faint and high
proper motion objects, which we used to define a new and independent
sample of cool white dwarfs. With this survey we aim to derive new
constraints on the halo white dwarf space density. Also, these data
can provide information on the age of thick disk and halo through the
analysis of the luminosity function. On the basis of astrometric and
photometric parameters, we selected candidates with mu>0.28mas/yr
and RF>16 in an area of 1150 square degrees. Then, we separated
white dwarfs from late type dwarfs and subdwarfs by means of the
reduced proper motion diagram. Finally, spectroscopic follow-up
observations were carried out to confirm the white dwarf nature of the
selected candidates. We found 41 white dwarfs of which 24 are new
discoveries. Here we present the full sample and for each object
provide positions, absolute proper motions, photometry, and
spectroscopy.
Description:
The GSC-II white dwarf survey catalogue contains astrometry photometry
and classification for 41 cool white dwarfs.
For each object equatorial coordinates, absolute proper motions,
photographic photometry (BJ, RF), SDSS and 2MASS photometry,
spectroscopic classification, and cross-match with Luyten's catalogue
(LHS, NLTT) are given. Position accuracy is in the range of 0.2"-0.3"
while proper motions have a typical total error between 2 and 6mas/yr.
Magnitudes are between 15.1<RF<19.7 and colors in the range
-0.1<BJ-RF<1.9. Proper motions are in the range (0.2-1.1)mas/yr.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 41 Positions, proper motions and epoch of the
corresponding position
table3.dat 87 41 Photographic photometry, classification, source
telescope, and WD ID in other catalogues
(Villanova and SDSS)
table4.dat 83 41 Cross-match with Luyten's catalogue (LHS and NLTT).
Photometry from SDSS and 2MASS.
pos_2000.dat 48 41 *Positions computed for epoch J2000
pmotions.dat 96 129 *Compilation of proper motions
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Note on pos_2000.dat, pmotions.dat:
These 2 tables are not part of the original data, but were added
at CDS with the help of B. Skiff (Lowell Observatory)
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See also:
J/AJ/128/1825 : Photometry identification of cool white dwarfs (Kilic+, 2004)
J/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 2003)
J/ApJ/586/1356 : JHKs photometry of 2MASS white dwarf (Wachter+, 2003)
J/A+A/363/1040 : DB white dwarfs from the Hamburg/ESO survey (Friedrich+, 2000)
J/ApJS/133/413 : BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [GSC2U]
7- 22 A16 --- GSC2U Object identifier (JHHMMSS.s+DDMMSS)
24- 25 I2 h RAh Right Ascension (J2000, at Epoch)
27- 28 I2 min RAm Right Ascension (J2000, at Epoch)
30- 34 F5.2 s RAs Right ascension (J2000, at Epoch)
36 A1 --- DE- Declination sign (J2000, at Epoch)
37- 38 I2 deg DEd Declination (J2000, at Epoch)
40- 41 I2 arcmin DEm Declination (J2000, at Epoch)
43- 46 F4.1 arcsec DEs Declination (J2000, at Epoch)
48- 54 F7.1 mas/yr pmRA Proper motion in RA(*cos(Dec))
56- 59 F4.1 mas/yr e_pmRA Error on pmRA
61- 66 F6.1 mas/yr pmDE Proper motion in Dec
68- 71 F4.1 mas/yr e_pmDE Error on pmDE
73- 79 F7.2 yr Epoch Epoch of the position
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [GSC2U]
7- 22 A16 --- GSC2U Object identifier (JHHMMSS.s+DDMMSS)
24- 28 F5.2 mag BJmag Magnitude in J photographic band (blue) (1)
30- 34 F5.2 mag RFmag Magnitude in F photographic band (red) (1)
36- 40 F5.2 mag BJ-RF BJ-RF colour index
42- 52 A11 --- SpType Spectral type
55- 61 A7 --- Tel Source Telescope (TNG, INT, WHT)
64- 87 A24 --- Name WD ID in other catalogues
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Note (1): Main characteristic of the blue and red plate material:
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Survey Epoch Emulsion+Filter Band Depth
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POSS-II J 1987-00 IIIaJ+GG385 BJ 22.5
POSS-II F 1987-99 IIIaF+RG610 RF 20.8
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See also
http://www-gsss.stsci.edu/gsc/gsc2/GSC2home.htm : the GSC-II Home Page
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [GSC2U]
7- 22 A16 --- GSC2U Object identifier (JHHMMSS.s+DDMMSS)
24- 34 A11 --- Luyten ? Luyten's Catalogues identifier (LHS, LP)
37- 41 F5.2 mag umag ? SDSS magnitude in u filter (1)
43- 47 F5.2 mag gmag ? SDSS magnitude in g filter (1)
49- 53 F5.2 mag rmag ? SDSS magnitude in r filter (1)
55- 59 F5.2 mag imag ? SDSS magnitude in i filter (1)
61- 65 F5.2 mag zmag ? SDSS magnitude in z filter (1)
67- 71 F5.2 mag Jmag ? 2MASS magnitude in J filter (2)
73- 77 F5.2 mag Hmag ? 2MASS magnitude in H filter (2)
79- 83 F5.2 mag Kmag ? 2MASS magnitude in K filter (2)
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Note (1): The response curves of the SDSS filters (u g r i z) can be found on
the SDSS pages: http://www.sdss.org/dr3/instruments/imager/index.html
Note (2): See also:
http://www.ipac.caltech.edu/2mass/ : 2MASS documentation
VII/233 : The Two Micron All-Sky Survey: Extended sources (Cutri+ 2003)
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Byte-by-byte Description of file: pos_2000.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [GSC2U]
7- 22 A16 --- GSC2U GSC2U name, as is the other tables
24- 25 I2 h RAh Right Ascension J2000, at Ep=2000 (hours)
27- 28 I2 min RAm Right Ascension J2000, at Ep=2000 (minutes)
30- 34 F5.2 s RAs Right Ascension J2000, at Ep=2000 (seconds)
36 A1 --- DE- Declination J2000, at Ep=2000 (sign)
37- 38 I2 deg DEd Declination J2000, at Ep=2000 (degrees)
40- 41 I2 arcmin DEm Declination J2000, at Ep=2000 (minutes)
43- 46 F4.1 arcsec DEs Declination J2000, at Ep=2000 (seconds)
48 A1 --- Ref Origin of the position (1)
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Note (1): the reference uses the following symbols:
b = USNO-B1.0 (2003AJ....125..984M 2003AJ....125..984M, I/284)
c = Carollo et al (2006A&A...448..579C 2006A&A...448..579C, this paper)
L = Lepine LSPM (2005AJ....129.1483L 2005AJ....129.1483L, I/298)
M = 2MASS (2006AJ....131.1163S 2006AJ....131.1163S, II/246)
s = Salim & Gould (2003ApJ...582.1011S 2003ApJ...582.1011S, J/ApJ/582/1011, table2)
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Byte-by-byte Description of file: pmotions.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [GSC2U]
7- 22 A16 --- GSC2U GSC2U name, as is the other tables
24- 30 F7.1 mas/yr pmRA Proper motion in RA, as given in Ref
33- 36 F4.1 mas/yr e_pmRA ? Mean error on pmRA, as given in Ref
38- 44 F7.1 mas/yr pmDE Proper motion in Declination, as given in Ref
47- 50 F4.1 mas/yr e_pmDE ? Mean error on pmDE, as given in Ref
53- 71 A19 --- Ref Reference (bibcode) of the proper motion
73- 96 A24 --- Rem Remarks on the proper motions (by B. Skiff)
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Acknowledgements: D. Carollo, carollo(at)to.astro.it
Acknowledgements:
The GSC-II is a joint project of the Space Telescope Science Institute
and the INAF-Osservatorio Astronomico di Torino. This work is based on
observations made with the Italian Telescopio Nazionale Galileo (TNG)
operated on the island of La Palma by the Centro Galileo Galilei of
the INAF (Istituto Nazionale di Astrofisica) at the Spanish
Observatorio del Roque de los Muchachos of the Instituto de
Astrofisica de Canarias, and also based on observations made with the
William Herschel Telescope (WHT) and the Isaac Newton Telescope (INT)
operated on the island of La Palma by the Isaac Newton Group in the
Spanish Observatorio del Roque de los Muchachos of the Instituto de
Astrofisica de Canarias.
(End) Patricia Vannier [CDS] 25-Nov-2005