J/A+A/506/1277 Modelling of Magellanic Cloud C/O stars (Groenewegen+, 2009)
Luminosities and mass-loss rates of SMC and LMC AGB stars and red supergiants.
Groenewegen M.A.T., Sloan G.C., Soszynski I., Petersen E.A.
<Astron. Astrophys. 506, 1277 (2009)>
=2009A&A...506.1277G 2009A&A...506.1277G
ADC_Keywords: Magellanic Clouds ; Stars, giant ; Stars, supergiant ; Mass loss
Keywords: stars: AGB and post-AGB - stars: mass loss - Magellanic Clouds
Abstract:
Mass loss is one of the fundamental properties of Asymptotic Giant
Branch (AGB) stars, and through the enrichment of the interstellar
medium, AGB stars are key players in the life cycle of dust and gas in
the universe. However, a quantitative understanding of the mass-loss
process is still largely lacking, particularly its dependence on
metallicity.
To investigate the relation between mass loss, luminosity and
pulsation period for a large sample of evolved stars in the Small and
Large Magellanic Cloud.
Description:
Dust radiative transfer models are presented for 101 carbon stars and
86 oxygen-rich evolved stars in the Magellanic Clouds for which 5-35um
Spitzer IRS spectra are available. The spectra are complemented with
available optical and infrared photometry to construct the spectral
energy distribution. A minimisation procedure is used to fit
luminosity, mass-loss rate and dust temperature at the inner radius.
Different effective temperatures and dust content are also considered.
Periods from the literature and from new OGLE-III data are compiled
and derived.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1c.dat 157 101 C-star sample: identifiers and pulsation periods
table2o.dat 157 86 O-star sample: identifiers and pulsation periods
table3c.dat 91 101 Fit results for the C-star sample
table4m.dat 109 172 Fit results for the O-star sample
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See also:
J/ApJ/348/98 : LMC AGB stars IRAS fluxes (Reid+ 1990)
J/A+A/377/945 : Variability and spectra of LMC giants (Cioni+ 2001)
J/AJ/129/1465 : Spectroscopy of red giants in the LMC bar (Cole+, 2005)
J/AJ/131/2514 : Radial velocities of red giants in the SMC (Harris+, 2006)
J/A+A/480/379 : Abundances of 59 red giants in LMC (Pompeia+, 2008)
Byte-by-byte Description of file: table1c.dat table2o.dat
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Bytes Format Units Label Explanations
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1- 62 A62 --- Names Various identifiers
64- 73 F10.6 deg RAdeg Right ascension, in decimal degrees (J2000)
75- 84 F10.6 deg DEdeg Declination, in decimal degrees (J2000)
87- 97 A11 --- Ident Identifier in Tables and Plots
102-120 A19 d Per Pulsation Period(s)
124-137 A14 --- Ref Reference code
140-144 F5.3 mag Amp1 ? Pulsation Amplitude
145 A1 --- --- [(]
146 A1 --- n_Amp1 [RIKVB] Filter for Amp1
147 A1 --- --- [)]
148 A1 --- --- [,]
150-153 F4.2 mag Amp2 ? Pulsation Amplitude
155 A1 --- --- [(]
156 A1 --- n_Amp2 [RK] Filter for Amp2
157 A1 --- --- [)]
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Byte-by-byte Description of file: table3c.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Ident Identifier
15- 18 I4 K Teff Effective temperature
23- 27 A5 --- Type Identification of type of dust (1)
33- 37 I5 solLum Lum Luminosity in solar units
41- 48 E8.2 solMass/yr dM/dt Mass-loss rate
52 I1 --- n_dM/dt [0/1] Code (1=free param; 0=fixed value)
56- 59 I4 K Tc Temperature at inner radius
63 I1 --- n_Tc [0/1] Code (1=free param; 0=fixed value)
67- 73 F7.1 --- Router Outer radius (relative to inner radius)
77- 82 F6.3 --- tau1 Optical depth at 0.55 micron
87- 91 F5.3 --- tau2 Optical depth at 11.3 micron
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Note (1): combination of amorphous carbon (AMC) and silicon carbide (SiC)
(α-SiC and β-SiC). The number refers to the percentage of SiC.
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Byte-by-byte Description of file: table4m.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Ident Identifier
15- 17 A3 --- SpType MK spectral type
25- 45 A21 --- Type Identification of type of dust (1)
49- 55 I7 solLum Lum Luminosity in solar units
59- 66 E8.2 solMass/yr dM/dt Mass-loss rate
70 I1 --- n_dM/dt [0/1] Code (1=free param; 0=fixed value)
74- 77 I4 K Tc Temperature at inner radius
81 I1 --- n_Tc [0/1] Code (1=free param; 0=fixed value)
85- 91 F7.1 --- Router Outer radius (relative to inner radius)
95-100 F6.3 --- tau1 Optical depth at 0.55 micron
105-109 F5.3 --- tau2 Optical depth at 10 micron
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Note (1): For every star there are two lines, for "laboratory silicates" and
"astronomical silicates". The first line provides the best fitting one.
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Acknowledgements:
Martin Groenewegen, marting(at)oma.be
(End) Martin Groenewegen [ROB], Patricia Vannier [CDS] 27-Aug-2009