Feige 4

All names: Gaia DR2 2756156315721682816, GEN# +6.10160795, PLX 53.01, Gaia DR3 2756156315721682816, Feige 4, GCRV 50277, PG 0017+136, SDSS J002001.81+135247.9, WDJ002001.81+135247.96, LB 433, FB 6, Gaia EDR3 2756156315721682816, EGGR 3, 2MASS J00200179+1352481, GCRV 21715, UBV M 43295, SDSS J002001.80+135248.0, PHL 795, uvby98 600000433, SDSS J002001.81+135248.00, TIC 397555532, WD 0017+136, CSI+13-00174, SDSS J002001.81+135248.0, GEN# +6.00000433, UBV 235

Parameter Unit Gaia EDR3 Pan-STARRS DR1 SDSS DR12 Genest-Beaulieu & Bergeron 2019 (spectroscopic) Genest-Beaulieu & Bergeron 2019 (photometric) MWDD H MWDD HE Gaia DR2 Stilism Koester & Kepler 2015 Limoges et al. 2015 Bergeron et al. 2011 Vincent et al. 2024 Simbad Gentile Fusillo et al. 2018 Eisenstein et al. 2006 White Dwarf Catalog (McCook & Sion 1999) Kleinman et al. 2013 Vincent et al. 2023
Right ascension 00 20 01.86 (0.04) 00 20 01.81 00 20 01.86 (0.07) 00 20 01.86 00 20 01.81 (0.04) 00 20 01.86 00 20 01.80 00 20 01.10 00 20 01.81
Declination 13 52 47.92 (0.03) 13 52 48.01 13 52 47.92 (0.06) 13 52 47.92 13 52 47.96 (0.03) 13 52 47.92 13 52 48.00 13 52 44.76 13 52 47.96
Spectral type DB DBA DB DB3 DBA DBA DB3 DBA DB
Effective temperature [K] 18146.0 17976.0 15476.0 17182.0 17973.0 (48) 18110.0 (288) 18130.0 (440) 18193.0 (358) 18394.0 (40) 18543.0 (82)
log(g) [cgs] 8.18 8.01 7.74 7.94 8.05 (0.02) 8.09 (0.06) 8.09 (0.07) 8.02 (0.02) 8.21 (0.02) 8.12 (0.02)
Mass [M] 0.7 0.601 0.476 0.56 0.65 (0.04) 0.65 (0.04) 0.605 (0.02)
log(Luminosity) [L] -1.86 -1.85
Cooling age [Gyr] 0.1161 0.1125 0.1318
log(H/He) -4.613 -4.45 (0.1) -4.61 (0.2)
log(C/He)
log(Ca/He) <-5.6
log(Ca/H)
log(N/He)
log(O/He)
log(Na/He)
log(Mg/He)
log(Al/He)
log(Si/He)
log(P/He)
log(S/He)
log(Cl/He)
log(Sc/He)
log(Ti/He)
log(V/He)
log(Cr/He)
log(Mn/He)
log(Fe/He)
log(Co/He)
log(Ni/He)
log(Cu/He)
log(Zn/He)
log(Ga/He)
log(Ge/He)
log(Sr/He)
Parallax [mas] 12.62 (0.05) 12.65 (0.09) 30.00 (9) 12.62 12.62 (0.05) 12.65 (0.09) 30.00 (9)
Distance [pc] 79.26 (0.3) 79.02 (0.6) 74.00 33.30 (12) 75.00 79.26 79.26 (0.3) 79.02 (0.6) 33.33 (10)
Composition He He
Proper motion (right ascension) [mas/yr] 48.81395217 (0.05) 48.57759339 (0.2) 48.814 (0.05) 48.578 56.2
Proper motion (declination) [mas/yr] -2.280441039 (0.04) -2.245175717 (0.09) -2.28 (0.04) -2.245 -2.5
Variability
Magnetic
Bd [MG]
Infrared excess (disk)
Binarity
B magnitude 15.10
V magnitude 15.37 15.22
R magnitude
I magnitude
J magnitude 15.82 (0.008)
H magnitude 15.88 (0.02)
K magnitude 15.92 (0.03)
u magnitude 15.04 (0.004) 15.04 (0.004) 15.04 (0.004) 15.08 (0.03) 15.07 15.08 (0.03)
g magnitude 15.15 (0.004) 15.15 (0.004) 15.15 (0.004) 15.20 (0.03) 15.19 15.19 (0.03)
r magnitude 15.51 (0.004) 15.51 (0.004) 15.51 (0.004) 15.53 (0.01) 15.52 15.52 (0.01)
i magnitude 15.77 (0.004) 15.78 (0.004) 15.78 (0.004) 15.81 (0.02) 15.81 15.79 (0.02)
z magnitude 16.04 (0.007) 16.04 (0.007) 16.04 (0.007) 16.08 (0.02) 16.08 16.05 (0.02)
G magnitude 15.34 (0.002) 15.36 15.34 15.34 (0.003) 15.36
BP magnitude 15.26 (0.002) 15.22 15.22
RP magnitude 15.48 (0.003) 15.48 15.48
Pan g magnitude 15.23 (0.001)
Pan r magnitude 15.52 (0.002)
Pan i magnitude 15.80 (0.002)
Pan z magnitude 16.05 (0.009)
Pan y magnitude 16.21 (0.005)
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.