2015MNRAS.450.3966B

Query : 2015MNRAS.450.3966B

2015MNRAS.450.3966B - Mon. Not. R. Astron. Soc., 450, 3966-3974 (2015/July-2)

A double white dwarf with a paradoxical origin?

BOURS M.C.P., MARSH T.R., GANSICKE B.T., TAURIS T.M., ISTRATE A.G., BADENES C., DHILLON V.S., GAL-YAM A., HERMES J.J., KENGKRIANGKRAI S., KILIC M., KOESTER D., MULLALLY F., PRASERT N., STEEGHS D., THOMPSON S.E. and THORSTENSEN J.R.

Abstract (from CDS):

We present Hubble Space Telescope UV spectra of the 4.6-h-period double white dwarf SDSS J125733.63+542850.5. Combined with Sloan Digital Sky Survey optical data, these reveal that the massive white dwarf (secondary) has an effective temperature T2 = 13 030±70±150K and a surface gravity log g2 = 8.73±0.05±0.05 (statistical and systematic uncertainties, respectively), leading to a mass of M2 = 1.06 M☉. The temperature of the extremely low-mass white dwarf (primary) is substantially lower at T1 = 6400±37±50K, while its surface gravity is poorly constrained by the data. The relative flux contribution of the two white dwarfs across the spectrum provides a radius ratio of R1/R2 ≃ 4.2, which, together with evolutionary models, allows us to calculate the cooling ages. The secondary massive white dwarf has a cooling age of ∼ 1 Gyr, while that of the primary low-mass white dwarf is likely to be much longer, possibly ≳ 5 Gyr, depending on its mass and the strength of chemical diffusion. These results unexpectedly suggest that the low-mass white dwarf formed long before the massive white dwarf, a puzzling discovery which poses a paradox for binary evolution.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): binaries: close - stars: individual: SDSS J125733.63+542850.5 - white dwarfs

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SDSS J125733.63+542850.5 WD* 12 57 33.6542910024 +54 28 50.449435680           DA 50 0

Query : 2015MNRAS.450.3966B

Basic data :
SDSS J125733.63+542850.5 -- White Dwarf
Other object types: otypes_help 		WD* (2006ApJS,WD,...), Opt (LAMOST,PSO,...), WD? (2021MNRAS), * (Gaia), NIR (2MASS)
ICRS coord. (ep=J2000) : 		12 57 33.6542910024 +54 28 50.449435680 (Optical) [ 0.0348 0.0390 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		12 55 23.1008302279 +54 45 01.562652273 [ 0.0348 0.0390 90 ]
Gal coord. (ep=J2000) : 		120.9977004101754 +62.6245706285729 [ 0.0348 0.0390 90 ]
Proper motions mas/yr : 		-45.545 11.457 [0.050 0.049 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -192 [4] / z(spectroscopic) -0.000640 [0.000013] / cz -191.94 [4.00]
   (Opt) C 2019MNRAS.486.2169K
Parallaxes (mas): 		8.3213 [0.0497] A 2020yCat.1350....0G
Spectral type: 		DA D 2006ApJS..167...40E
Fluxes (9) :
G 16.689363 [0.002823] C 2020yCat.1350....0G
J 16.296 [0.120] D 2003yCat.2246....0C
H 15.733 [0.169] D 2003yCat.2246....0C
K 15.261 [0.149] D 2011ApJS..197...38D
u (AB) 17.365 [0.009] C 2015ApJS..219...12A
g (AB) 16.8289 [0.0039] B 2017yCat.2349....0C
r (AB) 16.7387 [0.0041] B 2017yCat.2349....0C
i (AB) 16.7561 [0.0026] B 2017yCat.2349....0C
z (AB) 16.8043 [0.0079] B 2017yCat.2349....0C
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Identifiers (12) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

WD 1255+547 PSO J194.3899+54.4807 SDSS J125733.64+542850.5 EQ J1257+5428
LAMOST J125733.64+542850.5 SDSS J125733.63+542850.5 TIC 229515233 Gaia DR3 1570271658673389568
2MASS J12573372+5428505 SDSS J125733.64+542850.4 WIRED J125733.64+542850.5 Gaia DR2 1570271658673389568

References (50 between 1850 and 2026) (Total 50)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 4    Distance : 6    Fe/H : 8    Plx : 2    PM : 4    SpT : 9   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : SDSS J125733.63+542850.5

Link by name to the catalogue in VizieR :

WD 1255+547 2MASS J12573372+5428505 SDSS J125733.63+542850.5 SDSS J125733.64+542850.4 SDSS J125733.64+542850.5
Gaia DR3 1570271658673389568 Gaia DR2 1570271658673389568

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