# 2006A&A...459..229S

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 Query : 2006A&A...459..229S

2006A&A...459..229S - Astronomy and Astrophysics, volume 459, 229-240 (2006/11-3)

Non-LTE models for synthetic spectra of type Ia supernovae / hot stars with extremely extended atmospheres. II. Improved lower boundary conditions for the numerical solution of the radiative transfer.

SAUER D.N., HOFFMANN T.L. and PAULDRACH A.W.A.

Abstract (from CDS):

Realistic atmospheric models that link the properties and the physical conditions of supernova ejecta to observable spectra are required for the quantitative interpretation of observational data of type Ia supernovae (SN Ia) and the assessment of the physical merits of theoretical supernova explosion models. The numerical treatment of the radiation transport - yielding the synthetic spectra - in models of SN Ia ejecta in early phases is usually carried out in analogy to atmospheric models of normal'' hot stars. Applying this analogy indiscriminately leads to inconsistencies in SN Ia models because a diffusive lower boundary, while justified for hot stars, is invalid for hydrogen and helium-deficient supernova ejecta. In type Ia supernovae the radiation field does not thermalize even at large depths, and large optical depths are not reached at all wavelengths. We aim to derive an improved description of the lower boundary that allows a more consistent solution of the radiation transfer in SN Ia and therefore yields more realistic synthetic spectra. We analyze the conditions that lead to a breakdown of the conventional diffusion approximation as the lower boundary in SN Ia. For the radiative transfer, we use a full non-LTE code originally developed for radiatively driven winds of hot stars, with adaptations for the physical conditions in SN Ia. In addition to a well-tested treatment of the underlying microphysical processes, this code allows a direct comparison of the results for SN Ia and hot stars. We develop a semi-analytical description that allows us to overcome some of the limiting assumptions in the conventional treatment of the lower boundary in SN Ia radiative transfer models. We achieve good agreement in a comparison between the synthetic spectrum of our test model and an observed spectrum.

Journal keyword(s): radiative transfer - methods: numerical - line: formation - supernovae: general - stars: atmospheres - stars: winds and outflows

Full paper

 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 SN 1992A SN* 03 36 27.41 -34 57 31.4   12.56 12.50     SNIa 395 1

 Query : 2006A&A...459..229S

Basic data :
SN 1992A -- SuperNova
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:
SN* (SN), V* (AAVSO)
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) :
03 36 27.41 -34 57 31.4 [ 1500 1090 0 ] D
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) :
03 34 31.52 -35 07 22.5 [ 1500 1090 0 ]
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) :
235.89638 -54.05950 [ 1500 1090 0 ]
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) 1734 [~] / z(~) 0.0058 [~] / cz 1739 [~]
D
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:
SNIa C
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 (2) :
 B 12.56 [~] D V 12.50 [~] E ~
', {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 points in this preview
 All (CDSPortal) Send to 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. Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
 Some important notes on this object about identifications and objects associations. notes: SN is located 3" W and 62" N of the center of the apparent host galaxy NGC 1380 (Asiago Supernovae Catalog - Version 2008-Mar).

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

 : 1 : 524 Display criteria : All >=90% stars galaxies radio IR <2 arcsec #ref>50

 The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature. Identifiers (2) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

 SN 1992A AAVSO 0332-35

 References (395 between 1850 and 2023) (Total 395) Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system). Follow new references on this object
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Collections of Measurements

MK : 1

Observing logs

IUE : 10

External archives :

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2023.03.27-06:11:21