2006ApJ...651.1120K

Query : 2006ApJ...651.1120K

2006ApJ...651.1120K - Astrophys. J., 651, 1120-1125 (2006/November-2)

The pseudocontinuum bound-free opacity of hydrogen and its importance in cool white dwarf atmospheres.

KOWALSKI P.M.

Abstract (from CDS):

We investigate the importance of the pseudocontinuum bound-free opacity from hydrogen atoms in the atmospheres of cool white dwarfs. This source of absorption, when calculated by the occupation probability formalism applied in the modeling of white dwarf atmospheres with Teff<17,000 K, dominates all other sources of opacity at optical wavelengths. This is unrealistic and not observed. On the other hand, a significant flux suppression in the blue part of the spectra of cool white dwarfs has been reported and mainly interpreted as a result of the pseudocontinuum absorption from atomic hydrogen. We investigate this problem by proposing a new, more realistic approach to calculating this source of opacity. We show that this absorption is orders of magnitude smaller than that predicted by current methods. Therefore, we rule out the pseudocontinuum opacity as a source of the flux deficiency observed in the spectra of cool white dwarfs.

Abstract Copyright: ∼

Journal keyword(s): Atomic Processes - Dense Matter - Stars: Atmospheres - 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 EGGR 438 WD* 13 48 03.0103253113 +23 34 46.443561286   16.72   15.2   DC9 82 0

Query : 2006ApJ...651.1120K

Basic data :
EGGR 438 -- White Dwarf
Other object types: otypes_help 		PM* (2016ApJ,LHS,...), * (CNS5,GEN#,...), WD* (2015ApJS,EGGR,...), ** (WDS), WD? (2021MNRAS), NIR (2MASS), MIR (WISEA), Opt (PSO)
ICRS coord. (ep=J2000) : 		13 48 03.0103253113 +23 34 46.443561286 (Optical) [ 0.0186 0.0171 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		13 45 47.8469490847 +23 49 35.088250960 [ 0.0186 0.0171 90 ]
Gal coord. (ep=J2000) : 		020.5464914642459 +76.7360498221766 [ 0.0186 0.0171 90 ]
Proper motions mas/yr : 		-1485.656 125.010 [0.033 0.025 90] A 2020yCat.1350....0G
Parallaxes (mas): 		84.3105 [0.0289] A 2020yCat.1350....0G
Spectral type: 		DC9 C 1994BAAS...26..901D
Fluxes (10) :
B 16.72 [~] E ~
R 15.2 [~] E 2003AJ....125..984M
G 15.338058 [0.002766] C 2020yCat.1350....0G
J 13.921 [0.027] C 2003yCat.2246....0C
H 13.669 [0.036] C 2003yCat.2246....0C
K 13.621 [0.040] C 2003yCat.2246....0C
g (AB) 16.0639 [0.0015] B 2017yCat.2349....0C
r (AB) 15.3073 [0.0015] B 2017yCat.2349....0C
i (AB) 14.9878 [0.0056] B 2017yCat.2349....0C
z (AB) 14.8749 [0.0025] B 2017yCat.2349....0C
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Identifiers (21) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

EGGR 438 LSPM J1348+2334 USNO 536 WISEA J134801.86+233447.8
CNS5 3412 2MASS J13480299+2334462 USNO-B1.0 1135-00204107 Gaia DR3 1251824057289839744
GEN# +9.85380005 NLTT 35281 WDS J13484+2337B Gaia DR2 1251824057289839744
GJ 1179 B PM J13480+2334 WD 1345+23
LHS 361 PSO J207.0073+23.5799 WD 1345+238
LP 380-5 TIC 328936612 WD 1345+234

References (82 between 1850 and 2026) (Total 82)
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 : 4    Fe/H : 5    Plx : 2    PM : 8    SpT : 4   

   

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GJ 1179 B LHS 361 LSPM J1348+2334 2MASS J13480299+2334462 NLTT 35281
USNO-B1.0 1135-00204107 WDS J13484+2337B WD 1345+23 WD 1345+238 WD 1345+234
WISEA J134801.86+233447.8 Gaia DR3 1251824057289839744 Gaia DR2 1251824057289839744

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