J/ApJS/253/58 Ages of field stars from white dwarf comp. in Gaia (Qiu+, 2021)
Precise ages of field stars from white dwarf companions in Gaia DR2.
Qiu D., Tian H.-J., Wang X.-D., Nie J.-L., von Hippel T., Liu G.-C.,
Fouesneau M., Rix H.-W.
<Astrophys. J. Suppl. Ser., 253, 58 (2021)>
=2021ApJS..253...58Q 2021ApJS..253...58Q
ADC_Keywords: Stars, white dwarf; Stars, double and multiple; Proper motions;
Parallaxes, trigonometric; Photometry, ugriz; Stars, ages;
Stars, masses; Abundances, [Fe/H]
Keywords: Stellar ages ; Wide binary stars ; Field stars ;
Markov chain Monte Carlo ; Bayesian statistics ; Main sequence stars ;
White dwarf stars ; Zero-age main sequence stars ;
Stellar evolutionary tracks ; Initial mass function ; Photometry
Abstract:
We analyze 4050 wide binary star systems involving a white dwarf (WD)
and usually a main-sequence (MS) star, drawn from the large sample
assembled by Tian+ (2020, J/ApJS/246/4). Using the modeling code
BASE-9, we determine the system's ages, the WD progenitors' zero-age
MS masses, the extinction values (AV), and the distance moduli.
Discarding the cases with poor age convergences, we obtain ages for
3551 WDs, with a median age precision of στ/τ=20%, and
system ages typically in the range of 1-6Gyr. We validated these ages
against the very few known clusters and through cross validation of
236 WD-WD binaries. Under the assumption that the components are
coeval in a binary system, this provides precise age constraints on
the usually low-mass MS companions, mostly inaccessible by any other
means.
Description:
In this work, we select 9589 MS-WD and 307 WD-WD candidate binaries
from the catalog released by Tian+ (2020, J/ApJS/246/4), which is a
catalog of 807611 binaries, by searching from Gaia DR2 in a range of
distance <4.0kpc and the projected separation s<1.0pc.
According to the contamination rates, we selected 4050 MS-WD binaries
with contamination rates <20%. See Section 2.
We use an open-source software suite, BASE-9
(von Hippel+ 2014arXiv1411.3786V 2014arXiv1411.3786V), to constrain the ages, ZAMS mass,
AV, and distance modulus for the 4050 MS-WD candidate binaries.
See Section 3.
We build a catalog that includes the ages and other parameters (see
Table 2) of the 3551 field MS components. We also provide a catalog
that includes the ages and other parameters of the 3551 MS-WD and 236
WD-WD binaries (see Table 4).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 251 3551 Catalog of field MS components from the
primary dataset
table4.dat 604 3787 Total catalog
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See also:
I/343 : Gaia-PS1-SDSS (GPS1) proper motion catalog (Tian+, 2017)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)
I/351 : The extended Gaia-PS1-SDSS (GPS1+) PM catalog (Tian+, 2020)
J/A+AS/141/371 : Low-mass stars evolutionary tracks (Girardi+, 2000)
J/A+A/501/687 : Evolutionnary models for solar twins (do Nascimento+, 2009)
J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)
J/A+A/561/A142 : Galactic extinction from SDSS BHB stars (Tian+, 2014)
J/MNRAS/456/3655 : Masses and ages of red giants (Martig+, 2016)
J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diag. (Gaia Collaboration, 2018)
J/ApJ/870/9 : Ages & masses for GPS1 WD-MS binary systems (Fouesneau+, 2019)
J/MNRAS/482/4570 : Gaia DR2 white dwarf candidates (Gentile Fusillo+, 2019)
J/AJ/159/105 : Two new stellar assoc. in vicinity of the Sun (Liu+, 2020)
J/ApJS/246/4 : Catalog of ultrawide binary stars from Gaia DR2 (Tian+, 2020)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- Gaia2 Gaia DR2 source catalog identifier
21- 30 F10.6 deg RAdeg Barycentric right ascension (ICRS) at
Ep=2015.5
32- 41 F10.6 deg DEdeg Barycentric declination (ICRS) at Ep=2015.5
43- 49 F7.5 deg PDis [0.00057/0.14] Pair distance
51- 57 F7.3 mas plx [1/181] Gaia DR2 parallax
59- 66 F8.3 mas e_plx [8/2024] Uncertainty in plx
68- 73 F6.3 mag Gmag [4.8/19.7] Mean Gaia DR2 G band magnitude
75- 80 F6.4 mag e_Gmag [0.0001/0.02] Uncertainty in Gmag
82- 87 F6.3 mag Bpmag [4.9/21.2] Gaia DR2 Blue passband magnitude
89- 93 F5.3 mag e_Bpmag [0/0.2] Uncertainty in Bpmag
95- 100 F6.3 mag Rpmag [4.6/18.5] Gaia DR2 Red passband magnitude
102- 106 F5.3 mag e_Rpmag [0/0.04] Uncertainty in Rpmag
108- 117 F10.4 AU Sep [56/20635] Projected physical separation
119- 127 F9.3 mas/yr pmRA [-1870/1304] Gaia DR2 proper motion along RA
(pmRA*cos(DE))
129- 133 F5.3 mas/yr e_pmRA [0.017/2.1] Uncertainty in pmRA
135- 143 F9.3 mas/yr pmDE [-2044/1182] Gaia DR2 proper motion along DE
145- 149 F5.3 mas/yr e_pmDE [0.013/1.3] Uncertainty in pmDE
151- 158 F8.3 km/s RVel [-325/130]? Spectroscopic barycentric radial
velocity
160- 165 F6.3 km/s e_RVel [0.1/19.9]? Uncertainty in RVel
167- 172 F6.3 Gyr Age [0.08/12.7] Posterior median WD age
174- 179 F6.3 Gyr PreAge [0.039/12.6] Posterior median WD precursor age
181- 186 F6.3 Gyr CoolAge [0.002/10.4]? Posterior median WD cooling age
188- 193 F6.3 [Sun] [Fe/H] [-1.6/0.08] Posterior median metallicity
195- 200 F6.3 mag DM [-1.3/9.3] Posterior median distance modulus
202- 206 F5.3 mag Av [0/1.9] Posterior median WD V band
extinction
208- 212 F5.3 Gyr e_Age [0.013/3.5] Posterior standard deviation in
Age
214- 218 F5.3 Gyr e_PreAge [0.002/3.5] Posterior standard deviation in
PreAge
220- 225 F6.3 Gyr e_CoolAge [0.002/1.2]? Posterior standard deviation in
CoolAge
227- 231 F5.3 [Sun] e_[Fe/H] [0.047/0.7] Posterior standard deviation in
[Fe/H]
233- 237 F5.3 mag e_DM [0.001/0.2] Posterior standard deviation in DM
239- 243 F5.3 mag e_Av [0/0.4] Posterior standard deviation in AV
245 I1 --- Nb [3/7] Number of photometry bands used in
BASE-9 fitting
247- 251 F5.3 --- PCont [0/0.2] Contamination probability by random
alignments
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- ID1 Star 1 Gaia DR2 source catalog identifier
21- 39 I19 --- ID2 Star 2 Gaia DR2 source catalog identifier
41- 50 F10.6 deg RA1deg Star 1 Barycentric right ascension (ICRS)
at Ep=2015.5
52- 61 F10.6 deg RA2deg Star 2 Barycentric right ascension (ICRS)
at Ep=2015.5
63- 72 F10.6 deg DE1deg Star 1 Barycentric declination (ICRS) at
Ep=2015.5
74- 83 F10.6 deg DE2deg Star 2 Barycentric declination (ICRS) at
Ep=2015.5
85- 91 F7.3 mas plx1 [1/182] Star 1 Gaia DR2 parallax
93- 99 F7.3 mas plx2 [1/181] Star 2 Gaia DR2 parallax
101- 108 F8.3 mas e_plx1 [20/4028] Uncertainty in plx1
110- 117 F8.3 mas e_plx2 [2/3676] Uncertainty in plx2
119- 124 F6.3 mag Gmag1 [4.8/20.1] Star 1 mean Gaia DR2 G band
magnitude
126- 131 F6.3 mag Gmag2 [5.4/20.7] Star 2 mean Gaia DR2 G band
magnitude
133- 138 F6.4 mag e_Gmag1 [0.0001/0.02] Uncertainty in Gmag1
140- 145 F6.4 mag e_Gmag2 [0.0001/0.02] Uncertainty in Gmag2
147- 152 F6.3 mag Bpmag1 [4.9/20.5] Star 1 Gaia DR2 Blue passband
magnitude
154- 159 F6.3 mag Bpmag2 [5.8/21.2] Star 2 Gaia DR2 Blue passband
magnitude
161- 165 F5.3 mag e_Bpmag1 [0/0.06] Uncertainty in Bpmag1
167- 171 F5.3 mag e_Bpmag2 [0/0.2] Uncertainty in Bpmag2
173- 178 F6.3 mag Rpmag1 [4.6/19.3] Star 1 Gaia DR2 Red passband
magnitude
180- 185 F6.3 mag Rpmag2 [4.7/20.6] Star 2 Gaia DR2 Red passband
magnitude
187- 191 F5.3 mag e_Rpmag1 [0/0.06] Uncertainty in Rpmag1
193- 197 F5.3 mag e_Rpmag2 [0/0.2] Uncertainty in Rpmag2
199- 207 F9.3 mas/yr pmRA1 [-1868/1336] Star 1 Gaia DR2 proper motion
along RA (pmRA*cos(DE))
209- 217 F9.3 mas/yr pmRA2 [-1870/1304] Star 2 Gaia DR2 proper motion
along RA (pmRA*cos(DE))
219- 223 F5.3 mas/yr e_pmRA1 [0.017/1.1] Uncertainty in pmRA1
225- 229 F5.3 mas/yr e_pmRA2 [0.019/2.1] Uncertainty in pmRA2
231- 239 F9.3 mas/yr pmDE1 [-1948/1200] Star 1 Gaia DR2 proper motion
along DE
241- 249 F9.3 mas/yr pmDE2 [-2044/1182] Star 2 Gaia DR2 proper motion
along DE
251- 255 F5.3 mas/yr e_pmDE1 [0.013/1] Uncertainty in pmDE1
257- 261 F5.3 mas/yr e_pmDE2 [0.019/3] Uncertainty in pmDE2
263- 269 F7.3 km/s RVel1 [-86/130]? Star 1 spectroscopic
barycentric radial velocity
271- 278 F8.3 km/s RVel2 [-325/91]? Star 2 spectroscopic
barycentric radial velocity
280- 285 F6.3 km/s e_RVel1 [0.1/19]? Uncertainty in RVel1
287- 292 F6.3 km/s e_RVel2 [0.1/20]? Uncertainty in RVel2
294- 299 F6.3 mag gmag1 [12.97/21.11]? Star 1 g band magnitude
301- 306 F6.3 mag gmag2 [13.14/21.1]? Star 2 g band magnitude
308- 313 F6.3 mag rmag1 [13.24/19.74]? Star 1 r band magnitude
315- 320 F6.3 mag rmag2 [14/20.93]? Star 2 r band magnitude
322- 327 F6.3 mag imag1 [13.21/19.55]? Star 1 i band magnitude
329- 334 F6.3 mag imag2 [14.16/21]? Star 2 i band magnitude
336- 341 F6.3 mag zmag1 [13.79/19.61]? Star 1 z band magnitude
343- 348 F6.3 mag zmag2 [14.22/21.25]? Star 2 z band magnitude
350- 354 F5.3 mag e_gmag1 [0.001/0.3]? Uncertainty in gmag1
356- 360 F5.3 mag e_gmag2 [0/0.26]? Uncertainty in gmag2
362- 366 F5.3 mag e_rmag1 [0/0.22]? Uncertainty in rmag1
368- 372 F5.3 mag e_rmag2 [0/0.23]? Uncertainty in rmag2
374- 378 F5.3 mag e_imag1 [0/0.25]? Uncertainty in imag1
380- 384 F5.3 mag e_imag2 [0/0.2]? Uncertainty in imag2
386- 390 F5.3 mag e_zmag1 [0/0.23]? Uncertainty in zmag1
392- 396 F5.3 mag e_zmag2 [0/0.3]? Uncertainty in zmag2
398- 403 F6.3 Gyr Age1 [0.17/12.53]? Star 1 posterior median WD age
405- 410 F6.3 Gyr Age2 [0.08/12.7]? Star 2 posterior median WD age
412- 416 F5.3 Msun ZMass1 [0.8/7.8]? Star 1 ZAMS mass
418- 422 F5.3 Msun ZMass2 [0.8/8]? Star 2 ZAMS mass
424- 429 F6.3 Gyr PreAge1 [0.04/12.3]? Star 1 posterior median WD
precursor age
431- 436 F6.3 Gyr PreAge2 [0.03/12.6]? Star 2 posterior median WD
precursor age
438- 442 F5.3 Gyr CoolAge1 [0/8.9]? Star 1 posterior median WD
cooling age
444- 449 F6.3 Gyr CoolAge2 [0.002/10.4]? Star 2 posterior median WD
cooling age
451- 456 F6.3 [Sun] [Fe/H]1 [-1.53/0.08]? Star 1 posterior median
metallicity
458- 463 F6.3 [Sun] [Fe/H]2 [-1.52/0.08]? Star 2 posterior median
metallicity
465- 470 F6.3 mag DM1 [-1.3/7.7]? Star 1 posterior median
distance modulus
472- 477 F6.3 mag DM2 [-0.2/9.3]? Star 2 posterior median
distance modulus
479- 483 F5.3 mag Av1 [0/1.9]? Star 1 posterior median V band
extinction
485- 489 F5.3 mag Av2 [0.001/1.5]? Star 2 posterior median V
band extinction
491- 495 F5.3 Gyr e_Age1 [0.019/3.5]? Posterior standard deviation
in Age1
497- 501 F5.3 Gyr e_Age2 [0.013/3.5]? Posterior standard deviation
in Age2
503- 507 F5.3 Msun e_ZMass1 [0.02/1.1]? Uncertainty in ZMass1
509- 513 F5.3 Msun e_ZMass2 [0.007/1.5]? Uncertainty in ZMass2
515- 519 F5.3 Gyr e_PreAge1 [0.003/3.4]? Uncertainty in PreAge1
521- 525 F5.3 Gyr e_PreAge2 [0.002/3.5]? Uncertainty in PreAge2
527- 531 F5.3 Gyr e_CoolAge1 [0/0.7]? Uncertainty in CoolAge1
533- 537 F5.3 Gyr e_CoolAge2 [0.002/1.2]? Uncertainty in CoolAge2
539- 543 F5.3 [Sun] e_[Fe/H]1 [0.04/0.7]? Uncertainty in [Fe/H]1
545- 549 F5.3 [Sun] e_[Fe/H]2 [0.04/0.7]? Uncertainty in [Fe/H]2
551- 555 F5.3 mag e_DM1 [0.001/0.2]? Uncertainty in DM1
557- 561 F5.3 mag e_DM2 [0.001/0.3]? Uncertainty in DM2
563- 567 F5.3 mag e_Av1 [0/0.4]? Uncertainty in AV1
569- 573 F5.3 mag e_Av2 [0/0.4]? Uncertainty in AV2
575 I1 --- Nb1 [3/7]? Number of photometry bands used in
BASE-9 fitting for Star 1
577 I1 --- Nb2 [3/7]? Number of photometry bands used in
BASE-9 fitting for Star 2
579- 588 F10.4 AU Sep [56/32985] Projected physical separation
590- 596 F7.5 deg PDis [0.00057/0.14] Pair distance
598 I1 --- Type [1/2] Binary type (1)
600- 604 F5.3 --- PCont [0/0.2] Contamination probability by
random alignments
--------------------------------------------------------------------------------
Note (1): Binary type as follows:
1 = MS-WD (3551 occurrences);
2 = WD-WD (236 occurrences).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 01-Jul-2021