2012A&A...540A...2J


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.15CET07:29:30

2012A&A...540A...2J - Astronomy and Astrophysics, volume 540A, 2-2 (2012/4-1)

Variations on a theme - the evolution of hydrocarbon solids. II. Optical property modelling - the optEC(s) model.

JONES A.P.

Abstract (from CDS):

The properties of hydrogenated amorphous carbon (a-C:H) dust are known to evolve in response to the local conditions. We present an adaptable model for the determination of the optical properties of low-temperature, interstellar a-C:H grains that is based on the fundamental physics of their composition. The imaginary part of the refractive index, k, for a-C:H materials, from 50eV to cm wavelengths, is derived and the real part, n, of the refractive index is then calculated using the Kramers-Kronig relations. The formulated optEC(s) model allows a determination of the complex dielectric function, ε, and refractive index, m(n,k), for a-C:H materials as a continuous function the band gap, Eg, which is shown to lie in the range ≃-0.1 to 2.7eV. We provide expressions that enable a determination of their optical constants and tabulate m(n,k,Eg) for 14 different values of Eg. We explore the evolution of the likely extinction and emission behaviours of a-C:H grains and estimate the relevant transformation time-scales. With the optEC(s) model we are able to predict how the optical properties of an a-C:H dust component in the interstellar medium will evolve in response to, principally, the local interstellar radiation field. The evolution of a-C:H materials appears to be consistent with many dust extinction, absorption, scattering and emission properties, and also with H2 molecule, daughter ``PAH'' and hydrocarbon molecule formation resulting from its photo-driven decomposition.

Abstract Copyright:

Journal keyword(s): dust, extinction - ISM: general

VizieR on-line data: <Available at CDS (J/A+A/540/A2): optecsn.dat optecsk.dat>

Errata: + corrigendum vol. 545, p. C2

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 - 2020
#notes
1 IRC +10216 C* 09 47 57.406 +13 16 43.56     10.96     C9,5e 2106 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2019.11.15CET07:29:30

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
IRC +10216 -- Carbon Star
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:
IR (IRAS,IRC,...), PN (PK,PN,...), C* (Ref,CGCS), smm (JCMTSE,JCMTSF), Mi* (Ref), LP* (Ref), V* (V*), * ([LFO93]), G ([KKH2001]), Rad (Zel), FIR (Ref)
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) :
09 47 57.406 +13 16 43.56 (Infrared) [ 190 110 0 ] C 2003yCat.2246....0C
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) :
09 45 14.799 +13 30 40.20 [ 190 110 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) :
221.446592 +45.060421 [ 190 110 0 ]
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 :
33.84 10.0 [0.7 0.7 90] B 2018AJ....156...15M
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):
10.79 [4.60] D 2017MNRAS.471L...1S
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:
C9,5e C 1979MNRAS.186..837C
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 (9) :
V 10.96 [~] C 2002yCat.2237....0D
J 7.28 [~] C 2002yCat.2237....0D
H 4.03 [~] C 2002yCat.2237....0D
K 0.93 [~] C 2002yCat.2237....0D
u (AB) 24.88 [1.62] E 2012ApJS..203...21A
g (AB) 25.11 [1.17] E 2012ApJS..203...21A
r (AB) 18.656 [0.013] C 2012ApJS..203...21A
i (AB) 15.417 [0.003] C 2012ApJS..203...21A
z (AB) 13.028 [0.002] C 2012ApJS..203...21A
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Identifiers (18) :
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V* CW Leo JCMTSE J094757.1+131644 PK 221+45 1 Zel 0945+135
CGCS 2619 JCMTSF J094757.1+131644 PN G221.4+45.0 [KKH2001] 55
CRTS J094757.4+131643 LINEAR 17154286 RAFGL 1381 [LFO93] 0945+13
IRAS 09452+1330 2MASS J09475740+1316435 SCM 50
IRC +10216 NAME Peanut Nebula SDSS J094757.42+131643.6

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References (2106 between 1850 and 2020) (Total 2106)
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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PM : 1    PLX : 1    MK : 4    V* : 2   

   

Observing logs


ISO : 11    herschel : 380   

   


External archives :

Data at NED - NASA/IPAC Extragalactic Database : IRC +10216

Link by name to the catalogue in VizieR :

V* CW Leo CGCS 2619 IRAS 09452+1330 IRC +10216 2MASS J09475740+1316435
PN G221.4+45.0 RAFGL 1381 SDSS J094757.42+131643.6

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2019.11.15-07:29:30

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