J/A+A/317/503 Photometric & visibility data of IRC +10 216 (Groenewegen 1997)
IRC+10 216 revisited I: the circumstellar dust shell
Groenewegen M.A.T
<Astron. Astrophys. 317, 503 (1997)>
=1997A&A...317..503G 1997A&A...317..503G (SIMBAD/NED BibCode)
ADC_Keywords: Infrared sources ; Stars, variable
Keywords: circumstellar matter - stars: individual: IRC +10 216 -
stars: mass loss - stars: AGB, post-AGB - infrared: stars
Description:
A spherically symmetric dust radiative transfer code is used to model
the circumstellar dust shell around IRC +10 216. Compared to numerous
previous models a much larger body of observational data is used as
constraints; the spectral energy distribution between 0.5 and
60000µm, 2-4µm and 8-23µm spectra, optical, far-infrared and
centimeter sizes and interferometric visibility curves between 1.6 and
11.2µm are used to constrain the model. The most important result
is that in order to fit the visibility curve at 2.2µm and the size
of the shell in the optical, scattering has to be invoked.
Objects:
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RA (2000) DE Designation(s)
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09 47 57.2 +13 16 44 IRC +10216 = CW Leo
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
appen.tex 80 88 LaTeX version of Appendix
table1 145 13 Summary of existing models of IRC +10 216
table2 122 88 Photometric data used in the modeling
table3 92 13 Visibility data
tables.tex 144 244 LaTeX version of the tables
fig11.ps 60 108 Geometry of the problem
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 5 A5 --- Ref Reference (1)
7- 10 I4 K Teff Effective temperature or lowest value if
interval of the central star
11 A1 --- n_Teff [A-] Note on Teff (2)
12- 15 I4 --- Teff2 ? Highest effective temperature when interval
17- 28 A12 --- Depth Optical depth
30- 34 F5.2 --- Radc ? Inner radius or lowest value if interval
of the dust shell in stellar radii
35 A1 --- n_Radc Note on Radc (2)
36- 38 F3.1 --- Radc2 ? Highest inner radius when interval
41- 44 I4 K Tc ? Dust temperature at the inner dust radius
45 A1 --- n_Tc Note on Tc (2)
47- 90 A44 --- Grains Type of grain used
92- 95 F4.1 --- DensLaw ? r power number of the density law
96 A1 --- n_DensLaw [bce] Note on DensLaw (3)
98-103 I6 solLum/kpc2 L/D2 ? Luminosity versus square distance
104 A1 --- n_L/D2 '?' for unknown value
106-145 A40 --- Const Constraints used (4)
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Note (1): The references are:
MR80 = Mitchell & Robinson (1980MNRAS.190..669M 1980MNRAS.190..669M)
RRH83 = Rowan-Robinson & Harris (1983MNRAS.202..797R 1983MNRAS.202..797R)
MR87 = Martin & Rogers (1987ApJ...322..374M 1987ApJ...322..374M)
LB87 = Le Bertre (1987A&A...176..107L 1987A&A...176..107L)
LB88 = Le Bertre (1988A&A...203...85L 1988A&A...203...85L)
RK88 = Ridgway & Keady (1988ApJ...326..843R 1988ApJ...326..843R)
G90 = Griffin (1990MNRAS.247..591G 1990MNRAS.247..591G)
O90 = Orofino et al. (1990A&A...231..105O 1990A&A...231..105O)
LML93 = Lorenz-Martins & Lefevre (1993A&A...280..567L 1993A&A...280..567L)
D94 = Danchi et al. (1994AJ....107.1469D 1994AJ....107.1469D)
W94 = Winters et al. (1994A&A...288..255W 1994A&A...288..255W)
B95 = Bagnulo et al. (1995A&A...301..501B 1995A&A...301..501B)
IE96 = Ivezic & Elitzur (1996MNRAS.279.1011I 1996MNRAS.279.1011I)
Note (2): A means that the parameter value was assumed
- indicates an interval
? for unknown value
Note (3): b: fpr r≤10R*
c: Calculated from first principle
e: Density distribution calculated taking a constant mass lost rate
and a hydrodynamical calculation to determine the velocity law
Note (4): SED = spectral energy distribution
LRS = low resolution spectrograph
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 24 A24 --- Ref Reference
26- 32 F7.2 um Lambda Wavelength
33 A1 --- n_Lambda '-' when interval
34- 35 I2 um Lambda2 ? Highest wavelength when interval
37- 48 E12.2 --- Flux ? Flux (see unit in X_Flux)
51- 55 F5.1 --- e_Flux ? rms uncertainty on Flux
57- 62 A6 --- x_Flux Units of flux and e_Flux
64- 68 F5.1 arcsec Beam ? Beam size
69 A1 --- n_Beam [?x]? for unknown value; x for box beam
70- 71 I2 arcsec Beam2 ? Second value when box beam (AxB)
74- 77 F4.2 --- Phase [0/1[? Phase (1)
78 A1 --- n_Phase [?-] ? for unknown value; - when interval
79- 82 F4.2 --- Phase2 ? Highest values when interval
84-123 A40 --- Rem Remarks
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Note (1): The phase is calculated adopting a period of 649 days and maximum
light (phase=0.0) at JD = 2447483 (Le Bertre, 1992A&AS...94..377L 1992A&AS...94..377L).
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 5 F5.2 um Lambda Wavelength
7- 28 A22 --- Ref Reference
30- 33 F4.2 --- Phase1 [0/1[ Phase (1)
34 A1 --- n_Phase1 '-' when interval
35- 38 F4.2 --- Phase1b [0/1.25]? Upper value when interval
40- 43 F4.2 --- Phase2 [0/1[? Second values for the phase
45- 48 F4.2 --- Phase3 [0/1[? Third values for the phase
50- 94 A45 --- Rem Remarks
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Note (1): The phase is calculated adopting a period of 649 days and
maximum light (phase = 0.0) at JD = 2447483
(Le Bertre, 1992A&AS...94..377L 1992A&AS...94..377L).
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Acknowledgements: Martin Groenewegen
(End) Patricia Bauer [CDS] 07-Jun-1996