J/ApJ/870/9 Ages & masses for GPS1 WD-MS binary systems (Fouesneau+, 2019)
Precise ages of field stars from white dwarf companions.
Fouesneau M., Rix H.-W., Von Hippel T., Hogg D.W., Tian H.
<Astrophys. J., 870, 9-9 (2019)>
=2019ApJ...870....9F 2019ApJ...870....9F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple; Stars, white dwarf;
Stars, ages; Stars, masses; Abundances, [Fe/H];
Photometry, ugriz; Proper motions; Parallaxes, trigonometric
Keywords: methods: data analysis; methods: statistical; stars: evolution
stars: fundamental parameters; techniques: spectroscopic
Abstract:
Observational tests of stellar and Galactic chemical evolution call
for the joint knowledge of a star's physical parameters, detailed
element abundances, and precise age. For cool main-sequence (MS) stars
the abundances of many elements can be measured from spectroscopy, but
ages are very hard to determine. The situation is different if the MS
star has a white dwarf (WD) companion and a known distance, as the age
of such a binary system can then be determined precisely from the
photometric properties of the cooling WD. As a pilot study for
obtaining precise age determinations of field MS stars, we identify
nearly 100 candidates for such wide binary systems: a faint WD whose
Gaia-PS1-SDSS (GPS1) proper motion (Tian+ 2017, I/343) matches that of
a brighter MS star in Gaia/TGAS (Gaia Collaboration 2016, I/337) with
a good parallax (σρ/ρ=<0.05). We model the WD's
multi-band photometry with the BASE-9 code using this precise distance
(assumed to be common for the pair) and infer ages for each binary
system. The resulting age estimates are precise to =<10% (=<20%) for
42 (67) MS-WD systems. Our analysis more than doubles the number of
MS-WD systems with precise distances known to date, and it boosts the
number of such systems with precise age determination by an order of
magnitude. With the advent of the Gaia DR2 (Gaia Collaboration,
2018, I/345) data, this approach will be applicable to a far larger
sample, providing ages for many MS stars (that can yield detailed
abundances for over 20 elements), especially in the age range of
2-8Gyr, where there are only few known star clusters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 716 92 Photometric and astrometric data of the white dwarf
(WD) candidates
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/328 : AllWISE Data Release (Cutri+ 2013)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
I/343 : Gaia-PS1-SDSS (GPS1) proper motion catalog (Tian+, 2017)
J/ApJS/133/413 : BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001)
J/A+A/452/179 : Ages of SMC young clusters and field stars (Chiosi+, 2006)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/MNRAS/433/3398 : White dwarf main-sequence binaries (Rebassa-Mansergas+,2013)
J/ApJ/780/159 : Mass-age relations of old field stars (Epstein+,2014)
J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)
J/MNRAS/465/2849 : GaiaDR1 mass-radius relation white dwarfs (Tremblay+2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 20 I20 --- GPS1 Object identifier (objid) of white dwarf
companion from Tian+, 2017, I/343
22- 38 F17.13 deg RAdeg Right Ascension from fit (ICRS, Epoch J2010)
40- 50 E11.5 deg e_RAdeg [2e-08/100] Uncertainty in RAdeg
52- 68 F17.13 deg DEdeg [-29/69] Declination from fit
(ICRS, Epoch J2010)
70- 80 E11.5 deg e_DEdeg [2e-08/100] Uncertainty in DEdeg-gps1
82- 93 E12.5 deg/yr pmRA [-5e-5/6.5e-5] Proper motion in RA,
with cos(DE) applied (µα*)
95-105 E11.5 deg/yr e_pmRA [2.4e-7/1.5e-6] pmRA uncertainty
107-118 E12.5 deg/yr pmDE [-5.6e-5/5e-5] Proper motion in DE,
(µδ)
120-130 E11.5 deg/yr e_pmDE [2.6e-7/1.3e-6] pmDE uncertainty
132-138 F7.4 mag gmag [14/21] GPS1 g magnitude of the WD
from Pan-STARRS1 DR1
140-145 F6.4 mag e_gmag [0.001/0.05] GPS1 g band uncertainty
147-153 F7.4 mag rmag [14/20] GPS1 r magnitude of the WD
from Pan-STARRS1 DR1
155-160 F6.4 mag e_rmag [0.0004/0.04] GPS1 r band uncertainty
162-168 F7.4 mag imag [14/20] GPS1 i magnitude of the WD
from Pan-STARRS1 DR1
170-175 F6.4 mag e_imag [0.001/0.05] GPS1 i band uncertainty
177-183 F7.4 mag zmag [15/20] GPS1 z magnitude of the WD
from Pan-STARRS1 DR1
185-190 F6.4 mag e_zmag [0.001/0.05] GPS1 z band uncertainty
192-198 F7.4 mag ymag [15/20] GPS1 y magnitude of the WD
from Pan-STARRS1 DR1
200-205 F6.4 mag e_ymag [0.002/0.1] GPS1 y band uncertainty
207-212 F6.3 mag Jmag [15/18]?=99.99 GPS1 J magnitude of the WD
from 2MASS
214-219 F6.3 mag e_Jmag [0.04/0.2]?=99.99 GPS1 J band uncertainty
221-226 F6.3 mag Hmag [14/17]?=99.99 GPS1 H magnitude of the WD
from 2MASS
228-233 F6.3 mag e_Hmag [0.001/0.4]?=99.99 GPS1 H uncertainty
235-240 F6.3 mag Ksmag [14/18]?=99.99 GPS1 Ks magnitude of the WD
from 2MASS
242-247 F6.3 mag e_Ksmag [0.001/0.3]?=99.99 GPS1 Ks band uncertainty
249-255 F7.4 mag Gmag [14/20]?=99.99 GPS1 Gaia G magnitude of
the WD
257-263 F7.4 mag e_Gmag [0.0009/0.02]?=99.99 GPS1 Converted Gaia G
band uncertainty
265-270 F6.3 Gyr Age-mn [0.7/14.1] Posterior mean WD age
272-277 F6.3 Gyr Age-md [0.7/14.4] Posterior median WD age
279-283 F5.3 Gyr e_Age [0.05/3.3] Posterior standard deviation WD
age
285-290 F6.3 [-] [Fe/H]-mn [-1.7/-0.6] Posterior mean iron abundance
292-297 F6.3 [-] [Fe/H]-md [-1.7/-0.5] Posterior median iron abundance
299-303 F5.3 [-] e_[Fe/H] [0.2/0.8] Posterior standard deviation iron
abundance
305-309 F5.3 mag DM-mn [2.8/6.2] Posterior mean distance modulus
311-315 F5.3 mag DM-md [2.8/6.2] Posterior median distance modulus
317-321 F5.3 mag e_DM [0.01/0.11] Posterior standard deviation
distance modulus
323-327 F5.3 Msun Mass-mn [0.8/4.1] Posterior mean WD mass
329-333 F5.3 Msun Mass-md [0.7/4.2] Posterior median WD mass
335-339 F5.3 Msun e_Mass [0.02/0.42] Posterior standard deviation WD
mass
341-345 F5.3 Gyr cAge-mn [0.04/7.7] Posterior mean WD cooling age
347-351 F5.3 Gyr cAge-md [0.04/7.7] Posterior median WD cooling age
353-357 F5.3 Gyr e_cAge [0.007/0.5] Posterior standard deviation WD
cooling age
359-364 F6.3 Gyr pAge-mn [0.1/13] Posterior mean WD precusor's age
366-371 F6.3 Gyr pAge-md [0.1/14] Posterior median WD precusor's age
373-377 F5.3 Gyr e_pAge [0.02/3.3] Posterior standard deviation WD
precusor's age
379-393 F15.13 deg Sep [0.002/0.05] WD/Primary separation
395-413 I19 --- TGAS Primary TGAS DR1 identifier ("Source"
from Gaia DR1, 2016, I/337/tgas)
415-431 F17.13 deg RATdeg Barycentric Right Ascension in
ICRS from TGAS
433-440 F8.6 mas e_RATdeg [0.1/2] TGAS right ascension uncertainty
442-458 F17.13 deg DETdeg [-29/69] Barycentric Declination in ICRS
from TGAS
460-467 F8.6 mas e_DETdeg [0.1/2] TGAS declination uncertainty
469-485 F17.13 deg GLONT Galactic longitude from TGAS
487-503 F17.13 deg GLATT [-86/85] Galactic latitude from TGAS
505-522 F18.13 mas/yr pmRAT [-169/227] TGAS Proper motion in RA, with
cos(DE) applied, (µα*)
524-531 F8.6 mas/yr e_pmRAT [0.03/7.8] TGAS Standard error of pmRa
533-550 F18.13 mas/yr pmDET [-199/178] TGAS Proper motion in DE,
(µδ)
552-559 F8.6 mas/yr e_pmDET [0.01/5.5] TGAS Standard error of pmDE
561-568 F8.5 mas Plx [5.3/26] Gaia DR1 Parallax, Primary
570-577 F8.6 mas e_Plx [0.21/0.92] Gaia DR1 parallax uncertainty
579-585 F7.4 mag GmagT [6.3/12.3] Primary TGAS G band magnitude
587-605 A19 --- WISEA AllWISE identifier of the primary
(JHHMMSS.ss+DDMMSS.s;
from Cutri+, 2013, II/328)
607-612 F6.3 mag Jmag1 [5.1/10.2] Primary ALLWISE J mag from 2MASS
614-618 F5.3 mag e_Jmag1 [0.02/0.21]? Primary ALLWISE J uncertainty
620-625 F6.3 mag Hmag1 [4.9/10.3] Primary ALLWISE H mag from 2MASS
627-631 F5.3 mag e_Hmag1 [0.01/0.08] Primary ALLWISE H uncertainty
633-638 F6.3 mag Ksmag1 [5.1/10.1] Primary ALLWISE Ks mag from 2MASS
640-644 F5.3 mag e_Ksmag1 [0.01/0.07] Primary ALLWISE Ks uncertainty
646-650 F5.3 mag W1mag1 [5.1/9.3] Primary ALLWISE W1 (3.35um) mag
652-656 F5.3 mag e_W1mag1 [0.03/0.52]? Primary ALLWISE W1 uncertainty
658-663 F6.3 mag W2mag1 [5.4/10.8] Primary ALLWISE W2 (4.6um) mag
665-670 F6.3 mag e_W2mag1 [5.2/10.4] Primary ALLWISE W2 uncertainty
672-677 F6.3 mag W3mag1 [5.1/10.3] Primary ALLWISE W3 (11.6um) mag
679-683 F5.3 mag e_W3mag1 [0.01/0.04] Primary ALLWISE W3 uncertainty
685-689 F5.3 mag W4mag1 [0.01/0.08] Primary ALLWISE W4 (22.1um) mag
691-695 F5.3 mag e_W4mag1 [0.01/0.04] Primary ALLWISE W4 uncertainty
697-702 F6.4 Msun M1-p16 [0.58/1.5] 16th mass percentile of primary
704-709 F6.4 Msun M1-p50 [0.58/1.7] 50th mass percentile of primary
711-716 F6.4 Msun M1-p84 [0.59/1.9] 84th mass percentile of primary
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS] 04-Feb-2020