J/A+A/677/A159 Classification of the 100-500pc WDs (Torres+, 2023)
White dwarf spectral type-temperature distribution from Gaia-DR3 and
the Virtual Observatory.
Torres S., Cruz P., Murillo-Ojeda R., Jimenez-Esteban F.M.,
Rebassa-Mansergas A., Solano E., Camisassa M.E., Raddi R.,
Doliguez Le Lourec J.
<Astron. Astrophys. 677, A159 (2023)>
=2023A&A...677A.159T 2023A&A...677A.159T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, white dwarf; Stars, distances; Effective temperatures;
Stars, masses; Spectral types; Photometry; Optical
Keywords: white dwarfs - stars: atmospheres - virtual observatory tools -
catalogs
Abstract:
The characterization of white dwarf atmospheres is crucial for
accurately deriving stellar parameters such as effective temperature,
mass, and age. We aim to classify the population of white dwarfs up to
500 pc into hydrogen-rich or hydrogen-deficient atmospheres based on
Gaia spectra and to derive an accurate spectral type-temperature
distribution of white dwarfs as a function of the effective
temperature for the largest observed unbiased sample of these objects.
We took advantage of the recent Gaia low-resolution spectra available
for 76657 white dwarfs up to 500pc. We calculated synthetic J-PAS
narrow-band photometry and fitted the spectral energy distribution of
each object with up-to-date models for hydrogen-rich and helium-rich
white dwarf atmospheres. We estimated the probability for a white
dwarf to have a hydrogen-rich atmosphere and validated the results
using the Montreal White Dwarf Database. Finally, precise effective
temperature values were derived for each object using La Plata
evolutionary models. We have successfully classified a total of 65310
white into DAs and non-DAs with an accuracy of 94%. An unbiased
subsample of nearly 34000 objects was built, from which we computed a
precise spectral distribution spanning an effective temperature range
from 5,500 to 40,000 K, while accounting for potential selection
effects. Some characteristic features of the spectral evolution, such
as the deficit of helium-rich stars at Teff∼35000-40000K and in the
range 22000<Teff<25000K, as well as a gradual increase from 18000K to
Teff∼7000K, where the non-DA stars percentage reaches its maximum of
41%, followed by a decrease for cooler temperatures, are statistically
significant. These findings will provide precise constraints for the
proposed models of spectral evolution.
Description:
DA and non-DA spectral classification of the 100-500pc population of
white dwarfs from the low-resolution Gaia-DR3 spectra and the Virtual
Observatory (VO). Gaia information were collected for the whole
catalogue of 76657 white dwarfs within 500pc from the Sun. Spectral
classification, effective temperatures, masses, and gravities were
obtained for 57148 white dwarfs with temperatures higher than 5500K in
the range between 100 and 500pc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 287 57148 White dwarf 500 pc catalogue
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/MNRAS/518/5106 : Spectral classification of the 100pc WDs
(Jimenez-Esteban+, 2023)
http://www.montrealwhitedwarfdatabase.org/ : Montreal WD Database (MWDD)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- --- [Gaia DR3]
10- 28 I19 --- GaiaDR3 Object Gaia DR3 designation
30- 39 I10 --- Index Object random index
41- 53 F13.9 deg RAdeg Gaia-DR3 right ascension (ICRS) at Ep=2016.0
55- 65 F11.9 mas e_RAdeg Right ascension error
67- 79 F13.9 deg DEdeg Gaia-DR3 declination (ICRS) at Ep=2016.0
81- 91 F11.9 mas e_DEdeg Declination error
93-104 F12.9 mas Plx Gaia-DR3 parallax
106-116 F11.9 mas e_Plx Parallax error
118-129 F12.9 mag GMAG Gaia-DR3 absolute unredened G magnitude
131-142 F12.9 mag BP-RPc Corrected colour BP-RP
144-155 F12.9 --- Chi2-1 Reduced chi2 value, chi2DA
157-168 F12.9 --- Vgfb-1 Modified reduced chi2 value VgfbDA
170-181 F12.9 --- Chi2-2 Reduced chi2 value, chi2non-DA
183-194 F12.9 --- Vgfb-2 Modified reduced chi2 value Vgfbnon-DA
196-206 F11.9 --- PGJP [0/1] Probability of being DA according
to estimator GJP
208-226 F19.17 Msun Mass ?=0 White dwarf mass (1)
228-248 F21.19 Gyr Tcool ?=0 White dwarf cooling time (1)
250-268 F19.13 K Temp ?=0 White dwarf temperature (1)
270-287 F18.16 [cm/s2] logg ?=0 White dwarf surface gravity (1)
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Note (1): Photometric interpolation from evolutionary sequences of
La Plata models.
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Acknowledgements:
Santiago Torres, santiago.torres(at)upc.edu
(End) Patricia Vannier [CDS] 15-Sep-2023