J/AJ/125/2621 SDSS WD-M binary parameters (Raymond+, 2003)
A first look at white dwarf-M dwarf pairs in the Sloan Digital Sky Survey.
Raymond S.N., Szkody P., Hawley S.L., Anderson S.F., Brinkmann J.,
Covey K.R., Mcgehee P.M., Schneider D.P., West A.A., York D.G.
<Astron. J., 125, 2621-2629 (2003)>
=2003AJ....125.2621R 2003AJ....125.2621R (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Photometry, SDSS
Keywords: stars: binaries: spectroscopic - stars: activity - stars: late-type -
stars: white dwarfs
Abstract:
We have identified 109 white dwarf (WD)-M dwarf pairs in the Sloan
Digital Sky Survey (SDSS) with g<20th magnitude. For each system we
determined the temperature of the WD primary and the spectral type of
the M dwarf secondary. Using Hα emission as a proxy for the
chromospheric activity level of the M dwarf, we investigated
correlations between the activity level and properties of the system.
Compared with field M dwarfs previously observed in the Palomar/MSU
Survey, we see a slightly higher active fraction of early-type stars,
with activity levels similar to the field. We have conducted follow-up
observations at the ARC 3.5m telescope to obtain radial velocity
information and to search for short-period binaries that may be on the
verge of interacting. We report on one system with a 4.1hr period and
several additional systems with significant velocity variations.
Description:
We have compiled a sample of 109 WD-M binaries from the first year of
the Sloan Digital Sky Survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 77 109 WD-M binary parameters
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- SDSS Sloan Digital Sky Survey designation
(JHHMMSS.ss+DDMMSS.s)
26- 28 A3 --- f_SDSS Flag on SDSS (1)
30- 34 F5.2 mag gmag The SDSS g-band magnitude
36- 40 F5.2 mag u-g The SDSS (u-g) color index
42- 46 F5.2 mag g-r The SDSS (g-r) color index
48- 52 F5.2 mag r-i The SDSS (r-i) color index
54- 57 F4.2 mag i-z The SDSS (i-z) color index
59- 63 I5 K Teff White dwarf primary effective temperature (2)
65- 67 F3.1 --- MType Secondary M spectral type (3)
69- 71 I3 pc Dist Distance (4)
73- 77 F5.1 0.1nm EWHa Hα equivalent width in Angstroems
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Note (1): Flags as follows:
d = These objects have been observed twice by SDSS
e = This object has been observed three times by SDSS
f = These objects have follow-up APO observations (see Table 3)
g = These objects are in the SDSS Early Data Release (EDR; see
Stoughton et al, 2002AJ....123..485S 2002AJ....123..485S)
h = This object is a CV discovered by our photometric search pipeline.
Note (2): Errors are +2000K for Teff≤20000K, ±4000K for Teff>20000K.
Note (3): Errors are ±1-2 subclasses.
Note (4): Errors are ±20%.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Nov-2016