2022A&A...657A.121A


Query : 2022A&A...657A.121A

2022A&A...657A.121A - Astronomy and Astrophysics, volume 657A, 121-121 (2022/1-1)

Collisional effects in the blue wing of the Balmer-α line,.

ALLARD N.F., SPIEGELMAN F., KIELKOPF J.F. and BOURDREUX S.

Abstract (from CDS):

In order to investigate the near wing of the Lyman-α line, accurate line profile calculations and molecular data are both required due to the existence of a close line satellite responsible for its asymmetrical shape. Lyman-α lines observed with the Cosmic Origin Spectograph on the Hubble Space Telescope show this peculiarity in the spectra of DBA and DA white dwarf stars. A similar asymmetrical shape in the blue wing can be predicted in the Balmer-α line of H perturbed by He and H atoms. In continuation with a very recent work on the Lyman-α line, where the n = 2 potential energies and transition dipole moments from the ground state were determined, we present new accurate H-He potential energies and electronic transition dipole moments involving the molecular states correlated with H(n = 3)+He and their transition dipole moments with the states correlated with H(n = 2)+He. Those new data and existing molecular data for H(n = 2,3)-H are used to provide a theoretical investigation of the collisional effects in the blue wing of the Balmer-α line of H perturbed by He and H atoms. We note the consequences for the Balmer-α line shape in the physical conditions found in the cool atmosphere of DZA white dwarfs where helium densities may be as high as 1021 cm–3. This study is undertaken with a unified theory of spectral line broadening valid at very high helium densities.

Abstract Copyright: © N. F. Allard et al. 2022

Journal keyword(s): line: profiles - white dwarfs

VizieR on-line data: <Available at CDS (J/A+A/657/A121): fig6.dat fig10.dat>

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 - 2023
#notes
1 LAWD 25 WD* 07 40 20.7886676070 -17 24 49.156867583   13.36 13.061 12.886 12.70 DZQA6 196 0

Query : 2022A&A...657A.121A

Basic data :
LAWD 25 -- White Dwarf
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (CSI,GCRV,...), PM* (2016ApJS,LFT,...), WD* (1990ApJS,EGGR,...), ** (**,CCDM,...), IR (DENIS,2MASS,...), WD? (2018MNRAS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
07 40 20.7886676070 -17 24 49.156867583 (Optical) [ 0.0102 0.0110 90 ] A 2020yCat.1350....0G
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
07 38 02.0244826871 -17 17 21.823192619 [ 0.0102 0.0110 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
233.9602153372693 +02.4867604286601 [ 0.0102 0.0110 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
1138.690 -542.556 [0.018 0.016 90] A 2020yCat.1350....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) -10.0 [13.4] / z(~) -0.000033 [0.000045] / cz -10.00 [13.40]
   (Opt) E 2002AJ....124.1118S
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
109.3440 [0.0181] A 2020yCat.1350....0G
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
DZQA6 C 1990ApJS...72..707S
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (8) :
B 13.36 [0.03] D 2012yCat.1322....0Z
V 13.061 [0.002] D 2005AJ....130..337C
R 12.886 [0.002] D 2005AJ....130..337C
G 12.970207 [0.002768] C 2020yCat.1350....0G
I 12.70 [0.02] C 2005yCat.2263....0D
J 12.653 [0.022] C 2003yCat.2246....0C
H 12.611 [0.026] C 2003yCat.2246....0C
K 12.583 [0.036] C 2003yCat.2246....0C
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
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Identifiers (40) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

EGGR 54 GJ 283 A 2MASS J07402064-1724481 UCAC3 146-71201
** LUY 5693A IDS 07357-1710 A NLTT 18271 UCAC4 363-032829
CCDM J07402-1725A LAWD 25 PLX 1810.1 USNO 517
CSI-17-07381 1 LFT 543 PLX 1813 WDS J07402-1724A
CSI-17-07381 2 LHS 235 PLX 1810.10 WD 0738-172
CSI-17-07381 L 745-46 A PM 07381-1717 WD 0738-17
DENIS J074020.7-172448 L 745-46 TIC 289113764 WISEA J074021.62-172454.8
GCRV 58994 LP 783-3 UBV 7373 Zkh 109
GEN# +9.86745046 LPM 269 UBV 7376 Gaia DR2 5717278911884258176
GEN# +9.85783003 LTT 2915 UCAC2 25277198 Gaia DR3 5717278911884258176

References (196 between 1850 and 2023) (Total 196)
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


velocities : 2    distance : 4    Fe_H : 3    PLX : 3    PM : 5    MK : 5   

   

Observing logs


IUE : 3   

   


External archives :

Link by name to the catalogue in VizieR :

CCDM J07402-1725A DENIS J074020.7-172448 GJ 283 A LHS 235 2MASS J07402064-1724481
NLTT 18271 PLX 1813 UCAC2 25277198 UCAC3 146-71201 UCAC4 363-032829
WDS J07402-1724A WD 0738-172 WD 0738-17 WISEA J074021.62-172454.8 Gaia DR2 5717278911884258176
Gaia DR3 5717278911884258176

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2023.01.31-00:54:29

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