J/A+A/378/556 UVES/VLT spectra of white dwarfs (Koester+, 2001)
High-resolution UVES/VLT spectra of white dwarfs for the ESO SN Ia progenitor
survey (SPY). I.
Koester D., Napiwotzki R., Christlieb N., Drechsel H., Hagen H.J., Heber U.,
Homeier D., Karl C., Leibundgut B., Moehler S., Nelemans G., Reimers D.,
Reinecke E-M., Renzini A., Yungelson L.
<Astron. Astrophys. 378, 556 (2001)>
=2001A&A...378..556K 2001A&A...378..556K
ADC_Keywords: Stars, white dwarf ; Magnitudes ; Effective temperatures ;
Stars, masses
Keywords: stars: white dwarfs - stars: supernovae: general
Abstract:
We have started a large survey for radial velocity variations in white
dwarfs (PI R. Napiwotzki) with the aim of finding close double
degenerates, which could be precursor systems for SNe Ia. The UVES
spectrograph at the ESO VLT is used to obtain high resolution spectra
with good S/N. During this project 1500 white dwarfs will be observed.
This unique data set will also allow to derive atmospheric parameters
and masses for the largest sample of white dwarfs ever analyzed in a
homogeneous way. In this paper we present a catalog of objects and
report results for the first sample of about 200 white dwarfs, many of
which are spectroscopic confirmations of candidates from the Hamburg
ESO Quasar Survey (HE, Cat. J/A+AS/115/235),
Montreal-Cambridge-Tololo Survey (MCT), and Edinburgh-Cape Survey (EC,
Cat. J/MNRAS/287/867) surveys. Among the peculiar spectra we
identify two new magnetic DA, one previously known magnetic DA,
several DA with emission cores, in some cases due to a late-type
companion, and two new DBA.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 79 261 Observed DA and parameters from spectral fitting
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See also:
J/A+AS/115/235 : The Hamburg/ESO survey for bright QSOs. II. (Reimers+, 1996)
J/MNRAS/287/867 : Edinburgh-Cape Blue Object Survey. Zone 1. (Kilkenny+ 1997)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Object name, based on B1950 coordinates (1)
13 A1 --- n_Name [j] j: Name based on J2000 coordinates
15- 16 I2 h RAh Right ascension (J2000)
17 A1 --- --- [:]
18- 19 I2 min RAm Right ascension (J2000)
20 A1 --- --- [:]
21- 24 F4.1 s RAs Right ascension (J2000)
26 A1 --- DE- Declination sign (J2000)
27- 28 I2 deg DEd Declination (J2000)
29 A1 --- --- [:]
30- 31 I2 arcmin DEm Declination (J2000)
32 A1 --- --- [:]
33- 34 I2 arcsec DEs Declination (J2000)
36- 40 F5.2 mag Vmag V magnitude (or B or v, see n_Vmag)
41 A1 --- n_Vmag [Bv] B: photographic B magnitude in Vmag
v: multichannel v magnitude in vmag
44- 48 I5 K Teff Effective temperature
50- 53 I4 K e_Teff rms uncertainty on Teff
55- 58 F4.2 [cm/s2] logg Surface gravity
61- 64 F4.2 [cm/s2] e_logg rms uncertainty on logg
66- 70 F5.2 --- chi2 χ2 of the best fit
72- 75 F4.2 solMass Mass Mass
77- 79 A3 --- Rem Remark (2)
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Note (1): Object names:
WDHHMM+DDd: White Dwarf (Cat. III/129, III/210)
MCTHHMM+DDMM: Montreal-Cambridge-Tololo survey
ECHHMMm-DDMM: Edinburgh-Cape survey
HEHHMM+DDMM : Hamburg-ESO Survey
Note (2): Remarks:
1: no good fit to Balmer line cores
2: no good fit possible; although the fitting routine gives a solution
with reasonable χ2, which we have kept in the table, visual
inspection shows that the fit does not reproduce a correct Balmer
decrement. The mass value is not included in the table and in the
calculation of the mass distribution. The core of Hα may be
different between the two spectra
3: known double-degenerate G271-115 = EG11 = GJ 64 (Bergeron et al.,
1989ApJ...345L..91B 1989ApJ...345L..91B)
4: Hα and Hβ with core filled-in (emission core?)
5: Hα emission core
6: known DAB (Jordan et al., 1993A&A...273L..27J 1993A&A...273L..27J) fit is with pure
hydrogen models
7: double core in Hα variable between the two spectra
8: interstellar CaII
9: narrow CaII; possibly interstellar, but velocity difference to
Balmer lines <10km/s
10: strong CaII K; Hα with emission core
11: change in line profiles between two spectra; core filled in?
12: CaII, Hα and Hβ with emission cores
13: possibly weak broad CaII
N: parameters from fit with NLTE atmosphere grid.
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Acknowledgements: Detlev Koester
(End) Patricia Bauer [CDS] 27-Sep-2001