2004ApJ...611.1091V

Query : 2004ApJ...611.1091V

2004ApJ...611.1091V - Astrophys. J., 611, 1091-1099 (2004/August-3)

The new DAB white dwarf PG 1603+432 and the DAO/DAB phenomenon.

VENNES S., DUPUIS J. and CHAYER P.

Abstract (from CDS):

The far-ultraviolet (FUV) spectrum of the DA white dwarf PG 1603+432 obtained with the Far Ultraviolet Spectroscopic Explorer reveals the presence of helium and carbon in the atmosphere of the star. Our analysis of the FUV continuum and spectral lines, in particular the He II λ1085 and C III λ1175 line profiles, indicates Teff=35,075 K, logg=7.96, He/H=0.01, and C/H=1.4x10–7; we expect high signal-to-noise ratio optical spectroscopy to reveal weak He I λλ4471, 5876 spectral lines. Based on the line-profile analysis, helium appears to be homogeneously distributed in the atmosphere, but the absence of optical helium lines in past observations suggests a lower helium abundance in the optical photosphere relative to the deeper FUV photosphere or a time-variable abundance. PG 1603+432 is only the third DAB white dwarf found to populate the so-called DB gap (30,000-45,000 K), after GD 50 and HS 0209+0832, but this population does not appear to be an extension of the DAO white dwarf sequence toward lower temperatures.

Abstract Copyright: ∼

Journal keyword(s): Stars: Individual: Alphanumeric: PG 1603+432 - Ultraviolet: Stars - Stars: 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 PG 1603+432 WD* 16 05 21.1618424160 +43 04 35.934912660     15.32     DA1.3 40 0

Query : 2004ApJ...611.1091V

Basic data :
PG 1603+432 -- White Dwarf
Other object types: otypes_help 		* (FBS,GSC,...), WD* (2011Ap,WD), UV (GALEX,PG), WD? (2021MNRAS), PM* (2018yCat), V* (1SWASP), NIR (2MASS), Opt (SDSS)
ICRS coord. (ep=J2000) : 		16 05 21.1618424160 +43 04 35.934912660 (Optical) [ 0.0262 0.0294 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		16 03 42.3171644043 +43 12 44.040162700 [ 0.0262 0.0294 90 ]
Gal coord. (ep=J2000) : 		068.2201642746264 +47.9333050493805 [ 0.0262 0.0294 90 ]
Proper motions mas/yr : 		-20.984 -87.711 [0.031 0.040 90] A 2020yCat.1350....0G
Parallaxes (mas): 		8.3959 [0.0327] A 2020yCat.1350....0G
Spectral type: 		DA1.3 C 2011ApJ...743..138G
Fluxes (9) :
V 15.32 [~] D 2011MNRAS.410..899F
G 14.803886 [0.002821] C 2020yCat.1350....0G
J 15.590 [0.059] C 2003yCat.2246....0C
H 15.539 [0.120] D 2003yCat.2246....0C
u (AB) 14.204 [0.004] B 2009ApJS..182..543A
g (AB) 14.524 [0.004] B 2009ApJS..182..543A
r (AB) 15.056 [0.004] B 2009ApJS..182..543A
i (AB) 15.417 [0.005] B 2009ApJS..182..543A
z (AB) 15.786 [0.007] B 2009ApJS..182..543A
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Identifiers (12) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

WD 1603+432 GALEX J160521.1+430435 PG 1603+432 TIC 219472741
FBS B 362 GSC 03067-01784 SDSS J160521.15+430435.7 Gaia DR2 1385162244707678720
FBS 1603+432 2MASS J16052115+4304360 1SWASP J160521.18+430436.6 Gaia DR3 1385162244707678720

References (40 between 1850 and 2026) (Total 40)
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

Distance : 3    Fe/H : 6    Plx : 2    PM : 3    SpT : 4   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : PG 1603+432

Link by name to the catalogue in VizieR :

WD 1603+432 FBS B 362 FBS 1603+432 GALEX J160521.1+430435 GSC 03067-01784
2MASS J16052115+4304360 PG 1603+432 SDSS J160521.15+430435.7 Gaia DR2 1385162244707678720 Gaia DR3 1385162244707678720

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