J/AJ/143/103 New white dwarfs (Sayres+, 2012)
A multi-survey approach to white dwarf discovery.
Sayres C., Subasavage J.P., Bergeron P., Dufour P., Davenport J.R.A.,
Alsayyad Y., Tofflemire B.M.
<Astron. J., 143, 103 (2012)>
=2012AJ....143..103S 2012AJ....143..103S
ADC_Keywords: Stars, white dwarf ; Proper motions ; Photometry, SDSS
Keywords: catalogs; proper motions; stars: variables: general; surveys
white dwarfs
Abstract:
By selecting astrometric and photometric data from the Sloan Digital
Sky Survey (SDSS, II/306), the Lepine & Shara Proper Motion North
Catalog (LSPM-North, I/298), the Two Micron All Sky Survey (2MASS,
II/246), and the USNO-B1.0 (I/284) catalog, we use a succession of
methods to isolate white dwarf (WD) candidates for follow-up
spectroscopy. Our methods include reduced proper motion diagram cuts,
color cuts, and atmospheric model adherence. We present spectroscopy
of 26 WDs obtained from the CTIO 4m and APO 3.5m telescopes.
Additionally, we confirm 28 WDs with spectra available in the SDSS-DR7
database but unpublished elsewhere, presenting a total of 54 WDs. We
label one of these as a recovered WD while the remaining 53 are new
discoveries. We determine physical parameters and estimate distances
based on atmospheric model analyses. Three new WDs are modeled to lie
within 25 pc. Two additional WDs are confirmed to be metal-polluted
(DAZ). Follow-up time series photometry confirms another object to be
a pulsating ZZ Ceti WD.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 183 74 Astrometry and Photometry of white dwarfs and
20 subdwarfs
table2.dat 72 54 Atmospheric parameters for new discoveries
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See also:
I/298 : LSPM-North Catalog (Lepine+ 2005)
J/AJ/130/1680 : LSPM-North proper-motion catalog nearby stars (Lepine+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- WD WD name (HHMM+DDd, B1950); "subdwarf" for
spectroscopically confirmed subdwarfs (G1)
10- 33 A24 --- Name Name of the star
36- 37 I2 h RAh Right Ascension J2000, Ep=J2000 (hours)
39- 40 I2 min RAm Right Ascension J2000, Ep=J2000 (minutes)
42- 46 F5.2 s RAs Right Ascension J2000, Ep=J2000 (seconds)
48 A1 --- DE- Declination J2000, Ep=J2000 (sign)
49- 50 I2 deg DEd Declination J2000, Ep=J2000 (degrees)
52- 53 I2 arcmin DEm Declination J2000, Ep=J2000 (minutes)
55- 58 F4.1 arcsec DEs Declination J2000, Ep=J2000 (seconds)
60- 64 F5.3 arcsec/yr pm [0.01/0.44] Total proper motion
66- 70 F5.1 deg pmPA [0/360] Proper motion position angle
72- 74 A3 --- r_pm Reference of proper motion (1)
76- 81 F6.3 mag umag SDSS u-band PSF magnitude from SDSS-DR8
83- 87 F5.3 mag e_umag Mean error on umag
89- 94 F6.3 mag gmag SDSS g-band PSF magnitude from SDSS-DR8
96-100 F5.3 mag e_gmag Mean error on gmag
102-107 F6.3 mag rmag SDSS r-band PSF magnitude from SDSS-DR8
109-113 F5.3 mag e_rmag Mean error on rmag
115-120 F6.3 mag imag SDSS i-band PSF magnitude from SDSS-DR8
122-126 F5.3 mag e_imag Mean error on imag
128-133 F6.3 mag zmag SDSS z-band PSF magnitude from SDSS-DR8
135-139 F5.3 mag e_zmag Mean error on zmag
141-146 F6.3 mag Jmag 2MASS J-band magnitude (or from UKIDSS)
148-152 F5.3 mag e_Jmag Mean error on Jmag
154-159 F6.3 mag Hmag 2MASS H-band magnitude (or from UKIDSS)
161-165 F5.3 mag e_Hmag ?=- Mean error on Hmag
167-172 F6.3 mag Kmag 2MASS Ks-band magnitude (or from UKIDSS)
174-178 F5.3 mag e_Kmag ?=- Mean error on Kmag
180-183 A4 --- Src Source of spectroscopic data (2)
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Note (1): references as follows:
LEP = Lepine & Shara 2005, LSPM-North catalogue, I/298
SDS = Munn et al. 2004AJ....127.3034M 2004AJ....127.3034M
SSS = Supercosmos Sky Survey; see Hambly et al. 2001MNRAS.326.1315H 2001MNRAS.326.1315H
Note (2): sources of spectroscopy:
APO = Apache Point Observatory: Dual Imaging Spectrograph (DIS) on
the ARC 3.5m telescope in 2010-2011
CTIO = 4m Blanco telescope with Ritchey-Chretien Spectrograph in 2010-2011
SDSS = SDSS-DR7 database
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- WD Name of the white dwarf (HHMM+DDd, B1950) (G1)
12- 16 I5 K Te(p) Photometric effective temperature
19- 21 I3 K e_Te(p) Mean error on Te(p)
23- 29 A7 --- Comp Composition (H, He, etc)
31- 35 F5.1 pc Dist Photometric distance
38- 41 F4.1 pc e_Dist Mean error on Dist
43- 47 A5 --- SpT Spectral type
49- 53 I5 K Te(s) ?=- Spectroscopic effective temperature
56- 58 I3 K e_Te(s) ?=- Mean error on Te(s)
60- 63 F4.2 [cm/s2] logg ?=- Surface gravity (log)
66- 69 F4.2 [cm/s2] e_logg ?=- Mean error on logg
72 A1 --- Note [a-j] Individual notes (1)
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Note (1): notes as follows:
a = Teff from the SED fit is unreliable for the hottest WDs.
b = A combination of weak Balmer lines and/or noisy spectra prohibited
a reliable spectral fit.
c = Best-fit model includes log(C/He) = -4.2±0.2.
d = Best-fit model includes log(C/He) = -5.1±0.2.
e = Best-fit model includes log(Ca/H) = -9.0±0.2.
f = Best-fit model includes log(Ca/He) = -9.5±0.2.
g = Best-fit model includes log(Ca/H) = -9.0±0.2.
h = Best-fit model includes log(H/He) = -5.9±0.1
i = Best-fit model includes log(Ca/He) = -10.5±0.2.
j = 2102+233 is a ZZ Cet with a main oscillation period of ∼800s
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Global Notes:
Note (G1): in the published tables, the white dwarf LSPM J1341+0500 is
named WD 1336+052 in table1, but WD 1338+052 in table2. The name
WD 1338+052, compatible with B1950 position, was trained in table1,
History:
* 15-Oct-2014: the name "WD 1336+052" in table1 was fixed into
"WD 1338+052", to be compatible with table2. See also the
Note (G1) above.
(End) Francois Ochsenbein [CDS] 10-Oct-2014