J/AJ/134/252 New nearby white dwarf systems (Subasavage+, 2007)
The solar neighborhood.
XIX. Discovery and characterization of 33 new nearby white dwarf systems.
Subasavage J.P., Henry T.J., Bergeron P., Dufour P., Hambly N.C.,
Beaulieu T.D.
<Astron. J., 134, 252-261 (2007)>
=2007AJ....134..252S 2007AJ....134..252S
ADC_Keywords: Stars, nearby ; Stars, white dwarf ; Photometry, infrared ;
Effective temperatures
Keywords: solar neighborhood - stars: distances - stars: evolution -
stars: statistics - white dwarfs
Abstract:
We present spectra for 33 previously unclassified white dwarf systems
brighter than V=17, primarily in the southern hemisphere. Of these
new systems, 26 are DA, 4 are DC, 2 are DZ, and 1 is DQ. We suspect
that three of these systems are unresolved double degenerates. We
obtained VRI photometry for these 33 objects, as well as for 23 known
white dwarf systems without trigonometric parallaxes, also primarily
in the southern hemisphere. For the 56 objects, we converted the
photometry values to fluxes and fit them to a spectral energy
distribution using the spectroscopy to determine which model to use
(i.e., pure hydrogen, pure helium, or metal-rich helium), resulting in
estimates of Teff and distance.
Description:
Spectroscopic observations were taken on five separate observing runs
in 2003 October and December, 2004 March and September, and 2006 May
at the Cerro Tololo Inter-American Observatory (CTIO) 1.5m telescope
as part of the Small and Moderate Aperture Research Telescope System
(SMARTS) Consortium.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 106 57 Optical and infrared photometry and derived
parameters for new and known white dwarfs
table3.dat 86 57 Astrometry and alternate designations for new
and known white dwarfs
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See also:
J/AJ/129/413 : New high proper motion stars (-90<DE←47) (Subasavage+, 2005)
J/AJ/130/1658 : New high proper motion stars (-47<DE←00) (Subasavage+, 2005)
J/AJ/133/2898 : New proper-motion stars (-90<DE←47) (Finch+, 2007)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1 I1 --- n_WD [1/3] New or nearby WD (G1)
3- 11 A9 --- WD WD Name (HHMM+DDdA)
14- 18 F5.2 mag Vmag Johnson V magnitude
20- 24 F5.2 mag Rcmag Cousins R magnitude
26- 30 F5.2 mag Icmag Cousins I magnitude
32 I1 --- Nobs Number of observations
34- 38 F5.2 mag Jmag J magnitude
40- 43 F4.2 mag e_Jmag rms uncertainty on Jmag
45- 49 F5.2 mag Hmag H magnitude
51- 54 F4.2 mag e_Hmag ? rms uncertainty on Hmag
56- 60 F5.2 mag Ksmag Ks magnitude
62- 65 F4.2 mag e_Ksmag ? rms uncertainty on Ksmag
67- 71 I5 K Teff ? Effective temperature
73- 76 I4 K e_Teff ? rms uncertainty on Teff
78- 85 A8 --- Comp Composition (main chemical elements)
87- 90 F4.1 pc Dist ? Distance
92- 95 F4.1 pc e_Dist ? rms uncertainty on Dist
97-102 A6 --- SpType MK Spectral type
105-106 I2 --- Rem [1/12]? Individual notes (1)
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Note (1): Individual notes as follows:
1 = Distance via SED fit (not listed) is underestimated because the
object is likely an unresolved double degenerate with one
magnetic component (see Sect. 4.2). Instead, we adopt the
trigonometric parallax distance of 17.7±0.7pc derived via CTIOPI.
2 = Distance via SED fit (not listed) is underestimated because the
object is likely a distant (well beyond 25pc) unresolved double
degenerate (see Sect. 4.2).
3 = Distance via SED fit (not listed) is underestimated because the
object is likely a distant (well beyond 25pc) unresolved double
degenerate with components of type DA and DB (see Sect. 4.2).
Temperatures derived from the spectroscopic fit yield
9640±303 and 14170±1228K for DA and DB, respectively.
4 = Object is likely cooler than Teff∼5000K, and the theoretical
models do not provide an accurate treatment at these
temperatures (see Sect. 4.2). Instead, we use the linear
photometric distance relation of Salim et al.
(2004ApJ...601.1075S 2004ApJ...601.1075S) and obtain a distance estimate of
19.3±3.9pc.
5 = This object was observed as part of the EC survey and was
classified as an sdB+ (Kilkenny et al. 1997, Cat. J/MNRAS/287/867).
6 = Distance of 19.1±3.0pc is estimated using VRIJHKS for the
common proper-motion companion M dwarf and the relations of
Henry et al. (2004AJ....128.2460H 2004AJ....128.2460H). System is possibly within
25pc (see Sect. 4.2).
7 = Distance estimate is undetermined. Instead, we adopt the
distance measured via trigonometric parallax of 17.1±0.4pc
(see Sect. 4.2).
8 = Not listed in McCook & Sion (1999ApJS..121....1M 1999ApJS..121....1M, III/210,
III/235) but identified as a DC/DQ WD by Henry et al.
(2002AJ....123.2002H 2002AJ....123.2002H). We obtained blue spectra that show Ca II
H and K absorption and classify this object as DZ.
9 = The SED fit to the photometry is marginal. This object displays
deep swan-band absorption that significantly affects its
measured magnitudes.
10 = Not listed in McCook & Sion (1999ApJS..121....1M 1999ApJS..121....1M, III/210,
III/235) but identified as a WD by Luyten (1949ApJ...109..528L 1949ApJ...109..528L).
Spectral type is derived from our spectra.
11 = As of mid-2004, object has moved onto a background source.
Photometry is probably contaminated, which is consistent with
the poor SED fit for this object.
12 = Spectral type was determined using spectra published by Scholz
et al. (2002ApJ...565..539S 2002ApJ...565..539S).
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 I1 --- n_WD [1/3] New or nearby WD (G1)
3- 11 A9 --- WD WD Name (HHMM+DDdA)
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 23 F5.2 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 35 F4.1 arcsec DEs Declination (J2000)
37- 41 F5.3 arcsec/yr pm Total proper motion
43- 47 F5.1 deg pmPA Proper motion position angle
49 I1 --- r_pm Reference for proper motion (2)
51- 86 A36 --- ONames Alternative name(s)
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Note (2): References as follows:
1 = Luyten 1979, LHS Catalogue (I/87), NLTT Catalogue (I/98)
2 = Subasavage et al., 2005, Cat. J/AJ/129/413, J/AJ/130/1658, this work
3 = Pokorny et al., 2004, Cat. J/A+A/421/763
4 = Lepine et al., 2003AJ....126..921L 2003AJ....126..921L, 2005ApJ...633L.121L 2005ApJ...633L.121L
5 = Oppenheimer et al., 2001, Cat. J/other/Sci/292/698
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Global notes:
Note (G1): Types as follows:
1 = New spectroscopically confirmed WDs
2 = Known WDs without a trigonometric parallax estimated to be within 25pc
3 = Known WDs without a trigonometric parallax estimated to be beyond 25pc
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History:
From electronic version of the journal
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(End) Patricia Vannier [CDS] 25-Aug-2009