Ton 345

All names: SDSS J084539.17+225728.0, SDSS J084539.18+225728.00, WD 0842+231, Gaia EDR3 689352219629097856, 2MASS J08453917+2257282, SDSS J084539.18+225728.0, WIRED J084539.17+225728.0, GALEX J084539.2+225728, Gaia DR3 689352219629097856, TIC 184915712, LAMOST J084539.17+225728.0, SDSS J084539.17+225727.7, PG 0842+231, Ton 345, Gaia DR2 689352219629097856

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD HE Gaia DR2 Stilism Guo et al. 2015 Koester & Kepler 2015 Wilson et al. 2015 Jura et al. 2015 Brinkworth et al. 2012 Farihi et al. 2010 Vincent et al. 2024 Simbad White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 08 45 39.16 (0.04) 08 45 39.17 08 45 39.17 (0.07) 08 45 39.16 08 45 39.18 (0.04) 08 45 39.17 08 45 39.18
Declination 22 57 27.26 (0.02) 22 57 28.03 22 57 27.29 (0.04) 22 57 27.26 22 57 28.25 (0.02) 22 57 25.92 22 57 28.02
Spectral type DB DB;DBZ;debris_disk DB DB DBZ DB DB DBZ2.7 DB_DBZ DB
Effective temperature [K] 19432.0 19645.0 18645.0 20360.0 (139) 19780.0 (250) 18700.0 (700) 18600.0 18600.0 19583.0 (346) 25793.0 (264)
log(g) [cgs] 8.15 8.03 7.97 7.97 (0.02) 8.18 (0.2) 8.00 (0) 8.20 8.06 (0.02) 7.91 (0.03)
Mass [M] 0.689 0.614 0.577 0.71 0.63 (0.01)
log(Luminosity) [L]
Cooling age [Gyr] 0.0859 0.1600
log(H/He) -5.163 <-4.09 -5.1 (0.5) <-5.47 -4.5
log(C/He) -4.9 (0.2) -4.63 (0.2)
log(Ca/He) <-5.48 -5.95 (0.1) -6.23 (0.1) -6.9
log(Ca/H)
log(N/He) <-6.30
log(O/He) -4.25 (0.2) -4.58 (0.1)
log(Na/He)
log(Mg/He) -4.7 (0.1) -5.02 (0.1)
log(Al/He) -5.7 (0.1) -5.96 (0.1)
log(Si/He) -4.8 (0.3) -4.91 (0.1)
log(P/He)
log(S/He) <-5.40
log(Cl/He)
log(Sc/He) <-7.70
log(Ti/He) <-7.15 -7.74 (0.1)
log(V/He)
log(Cr/He) -6.4 (0.3) -6.91 (0.1)
log(Mn/He) -7 (0.4) -7.54 (0.1)
log(Fe/He) -4.6 (0.2) -5.07 (0.1)
log(Co/He)
log(Ni/He) -5.65 (0.3) -6.2 (0.1)
log(Cu/He)
log(Zn/He)
log(Ga/He)
log(Ge/He)
log(Sr/He)
Parallax [mas] 9.48 (0.06) 9.32 (0.09) 9.48 9.48 (0.06)
Distance [pc] 105.50 (0.6) 107.35 (1) 113.00 117.00 85.00 105.50 105.50 (0.6)
Composition He He He He He
Proper motion (right ascension) [mas/yr] -14.91792689 (0.06) -14.82582088 (0.1) -14.918 (0.06)
Proper motion (declination) [mas/yr] -61.72561791 (0.04) -61.62922554 (0.07) -61.726 (0.04)
Variability
Magnetic
Bd [MG]
Infrared excess (disk) yes yes
Binarity
B magnitude 15.20
V magnitude 15.90 16.07
R magnitude
I magnitude
J magnitude 16.23 (0.1)
H magnitude 15.96 (0.08)
K magnitude 16.48 (0.1)
u magnitude 15.58 (0.005) 15.58 (0.005) 15.56 (0.02)
g magnitude 15.70 (0.004) 15.70 (0.004) 15.73 (0.01)
r magnitude 16.07 (0.004) 16.07 (0.004) 16.08 (0.01)
i magnitude 16.35 (0.005) 16.35 (0.005) 16.35 (0.02)
z magnitude 16.60 (0.01) 16.60 (0.01) 16.62 (0.02)
G magnitude 15.88 (0.002) 15.90 15.88 15.88 (0.003)
BP magnitude 15.79 (0.002) 15.75
RP magnitude 16.05 (0.003) 16.05
Pan g magnitude 15.74 (0.005)
Pan r magnitude 16.08 (0.006)
Pan i magnitude 16.36 (0.003)
Pan z magnitude 16.58 (0.002)
Pan y magnitude 16.78 (0.008)
E(B-V) 0.004

* Constant surface field

Special notes:

Spectra

Controls

Normalize at:
Normalize by mean flux

Range:

x: to
y: to

Spectra available:

Spectra without link are available upon request

Absorption lines

Photometric filters

BVRI
ugriz

Photometric fit





The Montreal White Dwarf Database is produced and maintained by Prof. Patrick Dufour (Université de Montréal) and Dr. Simon Blouin (University of Victoria). Please send database updates, corrections, suggestions or bug reports to patrick.dufour@umontreal.ca.