J/A+A/537/A105 Modelling of AGB stars in the LMC (Gullieuszik+, 2012)
The VMC survey. III. Mass-loss rates and luminosities of LMC AGB stars.
Gullieuszik M., Groenewegen M.A.T., Cioni M.-R.L., de Grijs R.,
van Loon J.T., Girardi L., Ivanov V.D., Oliveira J.M., Emerson J.P.,
Guandalini R.
<Astron. Astrophys. 537, A105 (2012)>
=2012A&A...537A.105G 2012A&A...537A.105G
ADC_Keywords: Magellanic Clouds ; Stars, giant ; Stars, carbon; Mass loss
Keywords: AGB and post-AGB - stars: mass loss - Magellanic Clouds
Abstract:
Asymptotic giant branch (AGB) stars are major contributors to both the
chemical enrichment of the interstellar medium and the integrated
light of galaxies. Despite its importance, the AGB is one of the least
understood phases of stellar evolution. The main difficulties
associated with detailed modelling of the AGB are related to the
mass-loss process and the 3rd dredge-up efficiency. We provide direct
measures of mass-loss rates and luminosities for a complete sample of
AGB stars in the Large Magellanic Cloud, disentangling the C- and
O-rich stellar populations.
Description:
Dust radiative transfer models are presented for 374 AGB star
candidates in the VMC tile 83. The photometric spectral energy
distribution is fitted using dust radiative transfer models. A
minimisation procedure is used to fit the luminosity and optical depth
of the dusty shell, which is then used to calculate the mass-loss
rate. We also list the optical to mid-IR photometry for all 367 stars
classified as AGB stars, and the reduced χ squared for best-fitting
O- and C-rich models which were used to classify AGB stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
results.dat 55 374 Parameters of best-fitting models for all AGB
candidates (table2)
photom.dat 139 367 Photometry of sources classified as AGB stars
(table6)
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See also:
J/ApJ/348/98 : LMC AGB stars IRAS fluxes (Reid+ 1990)
J/A+A/506/1277 : Modelisation of Magellanic Cloud C/O stars (Groenewegen+ 2009)
J/A+A/530/A90 : Optically bright post-AGB population of LMC (van Aarle+, 2011)
J/A+A/531/A157 : VMC. II. LMC planetary nebulae (Miszalski+, 2011)
J/AJ/128/1606 : Magellanic Clouds Photometric Survey: the LMC (Zaritsky+ 2004)
Byte-by-byte Description of file: results.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/374] Sequential number
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 15 F5.2 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 27 F4.1 arcsec DEs Declination (J2000)
29- 34 F6.3 --- tau ?=0 Optical depth at 0.55 micron
36- 42 F7.3 [Msun/yr] logMdot ?=-99.999 Logarithmic mass-loss rate
44- 48 I5 Lsun Lum ?=0 Luminosity
50- 53 A4 --- Cl Object Classification (1)
55 A1 --- Q [BSU] Quality Flag, as B=bad fits, S=secure,
U=uncertain classification
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Note (1): Object Classification as follows:
AGN = Active galactic nucleus
C = C-rich AGB star
O = O-rich AGB star
ERO = Extremely Red Object
pAGB = post-AGB
YSO = Young stellar object
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Byte-by-byte Description of file: photom.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/374] Sequential number
5- 9 F5.2 mag Umag ?=99.99 MCPS U magnitude (J/AJ/128/1606)
11- 15 F5.2 mag Bmag ?=99.99 MCPS B magnitude (J/AJ/128/1606)
17- 21 F5.2 mag Vmag ?=99.99 MCPS V magnitude (J/AJ/128/1606)
23- 27 F5.2 mag Imag ?=99.99 MCPS I magnitude (J/AJ/128/1606)
29- 33 F5.2 mag YmagV ?=99.99 VMC Y magnitude
35- 39 F5.2 mag JmagV ?=99.99 VMC J magnitude
41- 45 F5.2 mag KsmagV ?=99.99 VMC Ks magnitude
47- 51 F5.2 mag Jmag2 2MASS J magnitude
53- 57 F5.2 mag Hmag2 2MASS H magnitude
59- 63 F5.2 mag Ksmag2 2MASS Ks magnitude
65- 69 F5.2 mag [3.6]1 ?=99.99 Spitzer/IRAC 3.6um from SAGE 1st epoch
71- 75 F5.2 mag [3.6]2 ?=99.99 Spitzer/IRAC 3.6um from SAGE 2nd epoch
77- 81 F5.2 mag [4.5]1 ?=99.99 Spitzer/IRAC 4.5um from SAGE 1st epoch
83- 87 F5.2 mag [4.5]2 ?=99.99 Spitzer/IRAC 4.5um from SAGE 2nd epoch
89- 93 F5.2 mag [5.8]1 ?=99.99 Spitzer/IRAC 5.8um from SAGE 1st epoch
95- 99 F5.2 mag [5.8]2 ?=99.99 Spitzer/IRAC 5.8um from SAGE 2nd epoch
101-105 F5.2 mag [8.0]1 ?=99.99 Spitzer/IRAC 8.0um from SAGE 1st epoch
107-111 F5.2 mag [8.0]2 ?=99.99 Spitzer/IRAC 8.0um from SAGE 2nd epoch
113-117 F5.2 mag [24]1 ?=99.99 Spitzer/MIPS 24um from SAGE 1st epoch
119-123 F5.2 mag [24]2 ?=99.99 Spitzer/MIPS 24um from SAGE 2nd epoch
125-131 F7.2 --- chi2C Reduced χ2 for best-fitting C-rich model
133-139 F7.2 --- chi2O Reduced χ2 for best-fitting O-rich model
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Acknowledgements:
Marco Gullieuszik, marco.gullieuszik(at)oapd.inaf.it
References:
Cioni et al., Paper I 2011A&A...527A.116C 2011A&A...527A.116C
Miszalski et al., Paper II 2011A&A...531A.157M 2011A&A...531A.157M, Cat. J/A+A/531/A157
(End) Marco Gullieuszik [Royal Obs. Belgium], Patricia Vannier [CDS] 24-Oct-2011