J/AJ/162/188 Hot degenerates in the MCT survey. III. (Bergeron+, 2021)
Hot degenerates in the MCT survey.
III. A sample of white Dwarf stars in the southern hemisphere.
Bergeron P., Wesemael F., Fontaine G., Lamontagne R., Demers S., Bedard A.,
Gingras M.-J., Blouin S., Irwin M.J., Kepler S.O.
<Astron. J., 162, 188-188 (2021)>
=2021AJ....162..188B 2021AJ....162..188B (SIMBAD/NED BibCode)
ADC_Keywords: Surveys; Stars, white dwarf; Photometry; Spectra, optical;
Effective temperatures; Stars, masses
Keywords: White dwarf stars; Surveys; Fundamental parameters of stars
Abstract:
We present optical spectra of 144 white dwarfs detected in the
Montreal-Cambridge-Tololo colorimetric survey, including 120 DA, 12
DB, 4 DO, 1 DQ, and 7 DC stars. We also perform a model atmosphere
analysis of all objects in our sample using the so-called
spectroscopic technique, or the photometric technique in the case of
DC white dwarfs. The main objective of this paper is to contribute to
the ongoing effort of confirming spectroscopically all white dwarf
candidates in the Gaia survey, in particular in the southern
hemisphere. All our spectra are made available in the Montreal White
Dwarf Database.
Description:
Most of the observations were obtained at the Cerro Tololo
Inter-American Observatory (CTIO) 1.5m and 4m telescopes, with a
variety of instrumental setups. Early runs at the 1.5m made use of the
UV SIT, RCA CCD no.5, and GE CCD EPI no.4, all in conjunction with the
Cassegrain spectrograph. From 1988-1994, however, data has been
gathered with the GEC CCD no.10. For our last run (1995
November-December), the detector was upgraded to a thinned Loral
1200x400 device. The spectral resolution achieved is 6.5-13Å. At
the CTIO 4m telescope, data were gathered with the RC spectrograph,
Air Schmidt or Folded Schmidt camera, and either the GEC no.11 or the
TI no.1 CCD with a resolution of 6-7Å. In addition, two runs were
secured in 1987 and 1989 at the Las Campanas 2.5m telescope, equipped
with a 2D Frutti detector, with a spectral resolution of 3Å.
Finally, a handful of spectra extending into the red were secured
through service observing at the La Palma Observatory with the double
spectrograph.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 144 Photometric and spectroscopic data
table2.dat 96 127 Atmospheric parameters of MCT white dwarfs
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See also:
B/wd : Spectroscopically identified white dwarfs (McCook+, 2014)
II/106 : Kiso Ultraviolet Catalog (KUV) (Noguchi+, 1980-1984)
II/212 : A Finding List of Faint UV-Bright Stars (Lanning+, 1998)
III/210 : Spectroscopically Identified White Dwarfs (McCook+, 1999)
II/231 : A Finding List of Faint UV-Bright Stars (Lanning+, 2000)
II/257 : A Finding List of Faint UV-Bright Stars (Lanning+, 1973-2004)
III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/ApJ/730/128 : Spectroscopy of DA WD from the SDSS-DR4 (Tremblay+, 2011)
J/ApJ/743/138 : Spectroscopic survey of bright white dwarfs (Gianninas+, 2011)
J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diagrams (Gaia Collaboration, 2018)
J/ApJ/878/63 : Cool WDatmosphere models IV. Spectral evolution (Blouin+, 2019)
J/ApJ/885/74 : 1340 Helium rich white dwarfs in the Gaia era (Coutu+, 2019)
J/MNRAS/482/4570 : Gaia DR2 white dwarf candidates (Gentile Fusillo+, 2019)
J/ApJ/898/84 : Spectro. follow-up of 100pc WDs in SDSS & Gaia (Kilic+, 2020)
J/MNRAS/497/130 : Gaia white dwarfs within 40pc. I (Tremblay+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- MCT Montreal-Cambridge-Tololo identifier
11- 12 I2 h RAh [0/23] Hour of Right Ascension (B1950)
14- 15 I2 min RAm Minute of Right Ascension (B1950)
17- 21 F5.2 s RAs Second of Right Ascension (B1950)
23- 23 A1 --- DE- [-] Sign of the Declination (B1950)
24- 25 I2 deg DEd [12/73] Degree of Declination (B1950)
27- 28 I2 arcmin DEm Arcminute of Declination (B1950)
30- 33 F4.1 arcsec DEs Arcsecond of Declination (B1950)
35- 39 F5.2 mag BPmag [13.3/16.9] B band photographic magnitude
41- 45 F5.2 mag U-B [-1.41/-0.48] Photographic (U-B) color
47- 48 I2 d Obs.D Observation date; day
50- 51 I2 "month" Obs.M Observation date; month
53- 54 I2 yr Obs.Y Observation date; year
56- 69 A14 --- Tel Telescope identifier
71- 72 I2 0.1nm R [3/13] Spectral resolution; Angstroms
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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- 9 A9 --- MCT Montreal-Cambridge-Tololo identifier
11- 16 A6 --- Type White Dwarf type
18- 36 I19 --- EDR3 ? Gaia EDR3 identifier
38- 42 I5 K Teff [7780/95040]? Effective temperature
44- 48 I5 K e_Teff [39/13197]? Uncertainty in Teff
50- 53 F4.2 [cm/s2] logg [6.52/8.78]? log surface gravity
55- 58 F4.2 [cm/s2] e_logg [0.01/0.6]? Uncertainty in log(g)
60- 63 F4.2 Msun Mass [0.31/1.08]? Stellar mass
65- 68 F4.2 Msun e_Mass [0/0.3]? Uncertainty in Mass
70- 82 A13 --- Comp Assumed atmospheric composition
84- 86 I3 pc Dist [23/911]? Gaia EDR3 parallactic distance
88- 91 F4.2 [yr] logtau [5.03/9.49]? log White Dwarf cooling time
93- 96 A4 --- Note Additional note(s) (1)
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Note (1): Notes as follows:
1 = Spectroscopically classified as a white dwarf in the MWDD (64 occurrences)
2 = ZZ Ceti variable (4 occurrences)
3 = double degenerate binary candidate (3 occurrences)
4 = physical parameters determined from the Gaia photometry and parallax
(7 occurrences)
5 = no Gaia parallax available (1 occurrence)
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History:
From electronic version of the journal
References:
Demers et al. Paper I : 1990ApJ...351..271D 1990ApJ...351..271D
Wesemael et al. Paper II : 1994ApJ...429..369W 1994ApJ...429..369W
(End) Prepared by [AAS], Coralie Fix [CDS], 20-Dec-2021