J/MNRAS/403/1213 Tracers of stellar mass-loss. I. (Gonzalez-Lopezlira+, 2010)
Tracers of stellar mass-loss.
I. Optical and near-IR colours and surface brightness fluctuations.
Gonzalez-Lopezlira R.A., Bruzual-A. G., Charlot S., Ballesteros-Paredes J.,
Loinard L.
<Mon. Not. R. Astron. Soc. 403, 1213 (2010)>
=2010MNRAS.403.1213G 2010MNRAS.403.1213G
ADC_Keywords: Models, evolutionary ; Stars, late-type ; Mass loss ;
Photometry, UBVRI ; Photometry, infrared
Keywords: stars: AGB and post-AGB - stars: carbon - stars: mass-loss -
Magellanic Clouds - infrared: stars - stars: circumstellar matter -
stars: evolution - galaxies: evolution - galaxies: stellar content
Abstract:
We present optical and IR integrated colours and SBF magnitudes,
computed from stellar population synthesis models that include
emission from the dusty envelopes surrounding TP-AGB stars undergoing
mass-loss. We explore the effects of varying the mass-loss rate by one
order of magnitude around the fiducial value, modifying accordingly
both the stellar parameters and the output spectra of the TP-AGB stars
plus their dusty envelopes. The models are single burst, and range in
age from a few Myr to 14Gyr, and in metallicity between Z=0.0001
and Z=0.07; they combine new calculations for the evolution of stars
in the TP-AGB phase, with star plus envelope SEDs produced with the
radiative transfer code DUSTY. We compare these models to optical and
near-IR data of single AGB stars and Magellanic star clusters. This
comparison validates the current understanding of the role of
mass-loss in determining stellar parameters and spectra in the TP-AGB.
However, neither broad-band colours nor SBF measurements in the
optical or the near-IR can discern global changes in the mass-loss
rate of a stellar population. We predict that mid-IR SBF measurements
can pick out such changes, and actually resolve whether a relation
between metallicity and mass-loss exists.
Description:
Table1 contains optical and near-infrared colours of Charlot & Bruzual
(CB09, 2009, in prep.) models with fiducial mass-loss, but without
dusty envelopes.
Table2: same as Table 1, but of models with fiducial mass-loss and
dusty envelopes.
Table3 contains surface brightness fluctuation (SBF) amplitudes of
Charlot & Bruzual (CB09, 2009, in prep.) models with fiducial
mass-loss but without dusty envelopes.
Table4: same as Table 3, but of models with dusty envelopes.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 67 342 Colours for CB09 models with fiducial mass-loss
but without dusty envelopes
table2.dat 67 342 Colours for CB09 models with fiducial mass-loss
and dusty envelopes
table3.dat 77 342 Surface brightness fluctuation (SBF) amplitudes
of CB09 models with fiducial mass-loss
but without dusty envelopes
table4.dat 77 342 Surface brightness fluctuation (SBF) amplitudes
of CB09 models with fiducial mass-loss
and dusty envelopes
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See also:
VI/109 : Population Synthesis Models at very low metallicities
(Schaerer, 2003)
J/A+A/401/1063 : Evolutionary synthesis models. III. (Anders+, 2003)
J/ApJS/171/146 : Population synthesis in the blue. IV (Schiavon+, 2007)
J/MNRAS/387/105 : Isochrone database, single- and binary-star SSPs (Li+, 2008)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.4 --- Z Initial metallicity
8- 11 F4.2 --- Y Initial helium fraction
13- 18 F6.3 Gyr Age Age
20- 25 F6.3 mag V-B V-B colour index
27- 32 F6.3 mag V-R V-R colour index
34- 39 F6.3 mag V-I V-I colour index
41- 46 F6.3 mag V-J V-J colour index
48- 53 F6.3 mag V-H V-H colour index
55- 60 F6.3 mag V-Ks V-K_s colour index
62- 67 F6.3 mag V-K V-K colour index
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Byte-by-byte Description of file: table3.dat table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.4 --- Z Initial metallicity
8- 11 F4.2 --- Y Initial helium fraction
13- 18 F6.3 Gyr Age Age
20- 25 F6.3 mag Bamp B band surface brightness fluctuation amplitudes
27- 32 F6.3 mag Vamp V band surface brightness fluctuation amplitudes
34- 39 F6.3 mag Ramp R band surface brightness fluctuation amplitudes
41- 46 F6.3 mag Iamp I band surface brightness fluctuation amplitudes
48- 53 F6.3 mag Jamp J band surface brightness fluctuation amplitudes
55- 61 F7.3 mag Hamp H band surface brightness fluctuation amplitudes
63- 69 F7.3 mag Ksamp Ks band surface brightness fluctuation amplitudes
71- 77 F7.3 mag Kamp K band surface brightness fluctuation amplitudes
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Acknowledgements:
Javier Ballesteros-Paredes, j.ballesteros(at)crya.unam.mx
(End) Patricia Vannier [CDS] 11-Dec-2009