J/MNRAS/413/1581 Candidate subdwarfs and white dwarfs (Gontcharov+, 2011)
Candidate subdwarfs and white dwarfs from the 2MASS, Tycho-2, XPM and UCAC3
catalogues.
Gontcharov G.A., Bajkova A.T., Fedorov P.N., Akhmetov V.S.
<Mon. Not. R. Astron. Soc., 413, 1581-1599 (2011)>
=2011MNRAS.413.1581G 2011MNRAS.413.1581G
ADC_Keywords: Surveys ; Stars, white dwarf ; Stars, subdwarf ; Proper motions ;
Photometry ; Stars, distances
Keywords: stars: Population II - subdwarfs - white dwarfs -
Galaxy: stellar content
Abstract:
Photometry from the Two-Micron All-Sky Survey (2MASS), United States
Naval Observatory CCD Astrograph Catalog (UCAC3) and SuperCosmos
catalogues, together with proper motions from the Tycho-2, Kharkiv
Proper Motions (XPM) and UCAC3 catalogues, is used to select all-sky
samples of 28 candidate white dwarfs, 1826 evolved and 7641 unevolved
subdwarfs for R from 9-17mag. The samples are separated from
main-sequence stars with an admixture of less than 10 per cent, owing
to an analysis of the distribution of the stars in colour index versus
reduced proper-motion diagrams for various latitudes using related
Monte Carlo simulations. It is shown that the XPM and UCAC3 catalogues
have the same level of proper-motion accuracy. Most of the selected
stars have at least six-band photometry. This allows us to eliminate
some admixtures and reveal some binaries. Empirical calibrations of
absolute magnitude versus colour index and reduced proper motion for
Hipparcos stars give us distances and a three-dimensional (3D)
distribution for all the selected stars. It is shown that the subdwarf
samples are almost complete for the Tycho-2 stars, i.e. to 11mag or
150pc from the Sun. For fainter stars from the XPM and UCAC3
catalogues, the subdwarf samples are complete only to 20-60 per cent
because of the selection method and incompleteness of the catalogues.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 161 9495 Catalogue of candidate subdwarfs and white
dwarfs from 2MASS, Tycho-2, XPM and UCAC3
--------------------------------------------------------------------------------
See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/315 : UCAC3 Catalogue (Zacharias+ 2009)
I/319 : XPM-1.0 Catalog of positions and proper motions (Fedorov+ 2010)
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- 2MASS 2MASS IAU2000 designation (HHMMSSss+DDMMSSs)
18- 27 A10 --- Tyc2 Tycho-2 designation (TYC1 TYC2)
29- 34 I6 --- HIP ? Hipparcos number
36 I1 --- Cl [1/3] Stellar class among WD, ESD, USD (1)
37- 41 F5.2 mag KsMAG Obtained absolute Ks magnitude
42- 48 F7.1 mas/yr pmGlon Proper motion along galactic longitude
(includes the cos(b) factor)
49- 55 F7.1 mas/yr pmGlat Proper motion along galactic latitude
56- 61 F6.2 mas plx ? Hipparcos parallax
62- 65 F4.1 mas e_plx ? Parallax precision
66- 70 F5.2 mag BTmag ? HIP/BT magnitude from Tycho-2
71- 74 F4.2 mag e_BTmag ? rms uncertainty on BTmag
75- 79 F5.2 mag VTmag ? HIP/VT magnitude from Tycho-2
80- 83 F4.2 mag e_VTmag ? rms uncertainty on VTmag
85- 89 F5.2 mag Jmag 2MASS J magnitude
91- 95 F5.2 mag Ksmag 2MASS Ks magnitude
97-101 F5.2 mag R3mag ? UCAC/R magnitude from UCAC3
103-106 F4.2 mag e_R3mag ? R3mag magnitude precision
108-112 F5.2 mag Bmag ? SuperCosmos B magnitude from SuperCosmos
114-118 F5.2 mag Rmag ? SuperCosmos R magnitude from SuperCosmos
120-124 F5.2 mag Imag ? SuperCosmos I magnitude from SuperCosmos
126 I1 --- q_Bmag [0/2]? B magnitude quality flag (unexplained)
127 I1 --- q_Rmag [0/2]? R magnitude quality flag (unexplained)
128 I1 --- q_Imag [0/2]? I magnitude quality flag (unexplained)
130-133 I4 pc Dist Obtained photometric heliocentric distance
134-138 I5 pc Xdist Obtained X distance (galactic frame)
139-143 I5 pc Ydist Obtained Y distance (galactic frame)
144-148 I5 pc Zdist Obtained Z distance (galactic frame)
149-154 F6.1 km/s RV ? Radial velocity
155-156 I2 km/s e_RV ? Radial velocity precision
158-161 F4.1 [Sun] Fe/H ? Metallicity
--------------------------------------------------------------------------------
Note (1): Stellar class as follows:
1 = white dwarf (WD)
2 = evolved subdwarf (ESD)
3 = unevolved subdwarf (USD)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Nov-2011