J/AJ/145/136 Astrometry and photometry of nearby white dwarfs (Limoges+, 2013)
Toward a spectroscopic census of white dwarfs within 40 pc of the Sun.
Limoges M.-M., Lepine S., Bergeron P.
<Astron. J., 145, 136 (2013)>
=2013AJ....145..136L 2013AJ....145..136L
ADC_Keywords: Stars, white dwarf ; Stars, distances ; Photometry, SDSS ;
Photometry, infrared ; Proper motions ; Spectral types ;
Stars, masses ; Effective temperatures
Keywords: proper motions - solar neighborhood - stars: distances - surveys -
techniques: spectroscopic - white dwarfs
Abstract:
We present the preliminary results of a survey aimed at significantly
increasing the range and completeness of the local census of
spectroscopically confirmed white dwarfs. The current census of nearby
white dwarfs is reasonably complete only to about 20pc of the Sun, a
volume that includes around 130 white dwarfs, a sample too small for
detailed statistical analyses. This census is largely based on
follow-up investigations of stars with very large proper motions. We
describe here the basis of a method that will lead to a catalog of
white dwarfs within 40pc of the Sun and north of the celestial
equator, thus increasing by a factor of eight the extent of the
northern sky census. White dwarf candidates are identified from the
SUPERBLINK proper motion database, allowing us to investigate stars
down to a proper motion limit µ>40mas/yr, while minimizing the
kinematic bias for nearby objects. The selection criteria and distance
estimates are based on a combination of color-magnitude and reduced
proper motion diagrams. Our follow-up spectroscopic observation
campaign has so far uncovered 193 new white dwarfs, among which we
identify 127 DA (including 9 DA+dM and 4 magnetic), 1 DB, 56 DC, 3 DQ,
and 6 DZ stars. We perform a spectroscopic analysis on a subsample of
84 DAs, and provide their atmospheric parameters. In particular, we
identify 11 new white dwarfs with spectroscopic distances within 25pc
of the Sun, including five candidates to the D<20pc subset.
Description:
Optical spectra have been obtained with the Steward Observatory 2.3m
telescope and the B&C spectrograph on 2009 May, 2009 Nov, 2010 July,
with the NOAO Mayall 4m telescope and the RC spectrograph on 2009 Aug,
2010 Mar, 2010 Oct, and with the NOAO 2.1m and the Goldcam
spectrograph on 2009 Dec, 2010 May. The adopted configurations allow a
spectral coverage of λλ3800-5600 and
λλ3800-6700, at an intermediate resolution of
∼6ÅFWHM. Spectra were first obtained at low signal-to-noise ratio
(S/N ∼25). As a result of our spectroscopic observations, 193 newly
identified white dwarfs from the SUPERBLINK catalog have been
spectroscopically confirmed (Tables 3 and 4).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 84 193 Spectroscopically confirmed white dwarfs from
UPERBLINK-astrometry
table4.dat 101 193 Spectroscopically confirmed white dwarfs from
UPERBLINK-photometry
table5.dat 76 84 Atmospheric parameters of DA white dwarfs from
SUPERBLINK
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See also:
III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
I/298 : LSPM-North Catalog (Lepine+ 2005)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/98 : NLTT Catalogue (Luyten, 1979)
J/ApJS/219/19 : Census of nearby white dwarfs from SUPERBLINK (Limoges+, 2015)
J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013)
J/ApJ/730/128 : Spectroscopy of DA WD from the SDSS-DR4 (Tremblay+, 2011)
J/ApJS/190/77 : Detailed analysis of cool WDs in the SDSS (Kilic+, 2010)
J/AJ/138/1681 : WD within 20pc of the Sun (Sion+, 2009)
J/AJ/135/1225 : Parameters of the local white dwarfs (Holberg+, 2008)
J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)
J/AJ/134/252 : New nearby white dwarf systems (Subasavage+, 2007)
J/ApJS/167/40 : SDSS4 confirmed white dwarfs catalog (Eisenstein+, 2006)
J/ApJ/643/402 : Cool white dwarfs in the solar neighborhood (Kawka+, 2006)
J/AJ/132/1221 : VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006)
J/AJ/131/582 : Cool white dwarfs in the SDSS (Kilic+, 2006)
J/ApJ/631/1100 : Atmospheric parameters of DA white dwarfs (Gianninas+, 2005)
J/ApJS/156/47 : DA white dwarfs from the Palomar Green Survey (Liebert+, 2005)
J/ApJ/607/426 : Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004)
J/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 2003)
J/ApJ/571/512 : Distances of white dwarf stars (Holberg+, 2002)
J/AJ/124/1190 : Northern high proper motion stars in DSS (Lepine+, 2002)
J/ApJS/133/413 : BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001)
http://www.astro.umontreal.ca/~bergeron/CoolingModels : Synthetic colors and
evolutionary sequences of H- and He-atmosphere WD
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name The PM I identifier (HHMMS+DDMMW) (G1)
13 A1 --- n_Name [n] n: Note on PM J02237+2055 (1)
15- 19 I5 --- NLTT ? NLTT catalog (cat. I/98) recno identification
21- 36 A16 --- SDSS The SDSS identifier (JHHMMSS.ss+DDMMs)
38- 39 I2 h RAh Hour of Right Ascension (J2000)
41- 42 I2 min RAm Minute of Right Ascension (J2000)
44- 48 F5.2 s RAs Second of Right Ascension (J2000)
50 A1 --- DE- Sign of the Declination (J2000)
51- 52 I2 deg DEd Degree of Declination (J2000)
54- 55 I2 arcmin DEm Arcminute of Declination (J2000)
57- 60 F4.1 arcsec DEs Arcsecond of Declination (J2000)
62- 66 F5.3 arcsec/yr pm Total proper motion
68- 73 F6.3 arcsec/yr pmRA Proper motion along Right Ascension
75- 80 F6.3 arcsec/yr pmDE Proper motion along Declination
82- 84 A3 --- Note Additional reference(s) (1-5) (2)
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Note (1): The corresponding white dwarf is in fact PM J02238+2055 (see Paper II,
Limoges+, 2015, J/ApJS/219/19) and not PM J02237+2055
(which is too red).
Note (2): Reference as follows:
1 = Also in Vennes et al. (2011MNRAS.410.2095V 2011MNRAS.410.2095V);
2 = Classified using our own data, but SDSS spectrum exists;
3 = Also in Kilic et al. (2010, cat. J/ApJS/190/77);
4 = Also in Sayres et al. (2012AJ....143..103S 2012AJ....143..103S);
5 = Also in Tonry et al. (2012ApJ...745...42T 2012ApJ...745...42T).
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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- 11 A11 --- Name The PM I identifier (HHMMS+DDMMW) (G1)
13- 17 F5.2 mag FUV ? GALEX FUV band magnitude
19- 23 F5.2 mag NUV ? GALEX NUV band magnitude
25- 28 F4.1 mag Bmag ? USNO-B1.0 BF photographic magnitude (2)
30- 33 F4.1 mag Rmag ? USNO-B1.0 RI photographic magnitude (2)
35- 38 F4.1 mag Imag ? USNO-B1.0 IN photographic magnitude (2)
40- 44 F5.2 mag Jmag ? 2MASS J band magnitude (from cat. II/246)
46- 50 F5.2 mag Hmag ? 2MASS H band magnitude (from cat. II/246)
52- 56 F5.2 mag Kmag ? 2MASS Ks band magnitude (from cat. II/246)
58- 62 F5.2 mag umag ? SDSS u band magnitude
64- 68 F5.2 mag gmag ? SDSS g band magnitude
70- 74 F5.2 mag rmag ? SDSS r band magnitude
76- 80 F5.2 mag imag ? SDSS i band magnitude
82- 86 F5.2 mag zmag ? SDSS z band magnitude
88- 92 F5.1 pc Dph Photometric distance
94- 99 A6 --- SpT Adopted spectral type (3)
101 A1 --- n_SpT Note about SpT (1-5) (4)
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Note (2): From SNO-B1.0 catalog (Monet et al., 2003, cat. I/284).
Note (3): DC, DA, DZ, DB, DZ, DA+dM, DAH, DQ, DAZ, DZA.
Note (4): Note as follows:
1 = Spectral range of λλ3200-5300; Hα data will be obtained
to confirm DC status;
2 = DA+DC candidate;
3 = Magnetic candidate;
4 = DA+DA candidate;
5 = Classified using our own data, but SDSS spectrum exists; Hα data will
be obtained to confirm DC status.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name The PM I identifier (HHMMS+DDMMW) (G1)
13- 17 I5 K Teff Effective temperature
19- 21 I3 K e_Teff Uncertainty in Teff
23- 26 F4.2 [cm/s2] logg Log of surface gravity
28- 31 F4.2 [cm/s2] e_logg Uncertainty in logg
33- 36 F4.2 Msun Mass Stellar mass relative to the Sun
38- 41 F4.2 Msun e_Mass Uncertainty in Mass
43- 47 F5.2 mag VMag Absolute visual magnitude
49- 53 F5.2 [Lsun] logL Log of stellar luminosity relative to the Sun
55- 59 F5.2 mag Vmag Estimated visual magnitude
61- 65 F5.1 pc Dsp Spectroscopic distance
67- 69 F3.1 pc e_Dsp Uncertainty in Dsp
71- 74 F4.2 [yr] logt Log of white dwarf cooling time (logτ)
76 I1 --- Note ? Additional note (1)
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Note (1): Note as follows:
1 = Bad GALEX photometry;
2 = Binary but only one set of magnitudes;
3 = Not in our new selection;
4 = DA+dM;
5 = Estimated from USNO photographic magnitudes.
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Global notes:
Note (G1): Our white dwarf candidates ( in Simbad) are
identified from the SUPERBLINK catalog of stars with proper motions
µ>40mas/yr. The current version of the catalog comprises 2283540
objects, all designated by the letters "PM I" followed by 10 characters
based on the right ascension and declination of the object.
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Acknowledgements:
Pierre Bergeron [Montreal university] for the confirmation that
PM J02238+2055 is indeed the white dwarf (see Note (1) in table 3).
History:
10-Jul-2014: From electronic version of the journal
11-Jan-2016: Note added in table 3 for PM J02237+2055
References:
Limoges et al. 2015ApJS..219...19L 2015ApJS..219...19L Cat. J/ApJS/219/19
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 13-Jun-2014