We introduce a new generation of PARSEC{COLIBRI stellar isochrones that include a detailed treatment of the thermally-pulsing asymptotic giant branch (TP-AGB) phase, and covering a wide range of initial metallicities (0:0001 < Zi < 0:06). Compared to previous releases, the main novelties and improvements are: use of new TP-AGB tracks and related atmosphere models and spectra for M and C-typestars; inclusion of the surface H+He+CNO abundances in the isochrone tables, accounting for the effeects of diffusion, dredge-up episodes and hot-bottom burning; inclusion of complete thermal pulse cycles, with a complete description of the in-cycle changes in the stellar parameters; new pulsation models to describe the long-period variability in the fundamental and rst overtone modes; new dust models that follow the growth of the grains during the AGB evolution, in combination with radiative transfer calculations for the reprocessing of the photospheric emission. Overall, these improvements are expected to lead to a more consistent and detailed description of properties of TP-AGB stars expected in resolved stellar populations, especially in regard to their mean photometric properties from optical to mid-infrared wavelengths. We illustrate the expected numbers of TP-AGB stars of dfferent types in stellar populations covering a wide range of ages and initial metallicities, providing further details on the \C-star island" that appears at intermediate values of age and metallicity, and about the AGB-boosting eect that occurs at ages close to 1.6-Gyr for populations of all metallicities. The isochrones are available through a new dedicated web server.

A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase

MARIGO, PAOLA;ROSENFIELD, PHILIP;ARINGER, BERNHARD;CHEN, YANG;DUSSIN, MARCO;NANNI, AMBRA;PASTORELLI, GIADA;DA SILVA RODRIGUES, THAISE;TRABUCCHI, MICHELE;BLADH, SARA JOHANNA;
2017

Abstract

We introduce a new generation of PARSEC{COLIBRI stellar isochrones that include a detailed treatment of the thermally-pulsing asymptotic giant branch (TP-AGB) phase, and covering a wide range of initial metallicities (0:0001 < Zi < 0:06). Compared to previous releases, the main novelties and improvements are: use of new TP-AGB tracks and related atmosphere models and spectra for M and C-typestars; inclusion of the surface H+He+CNO abundances in the isochrone tables, accounting for the effeects of diffusion, dredge-up episodes and hot-bottom burning; inclusion of complete thermal pulse cycles, with a complete description of the in-cycle changes in the stellar parameters; new pulsation models to describe the long-period variability in the fundamental and rst overtone modes; new dust models that follow the growth of the grains during the AGB evolution, in combination with radiative transfer calculations for the reprocessing of the photospheric emission. Overall, these improvements are expected to lead to a more consistent and detailed description of properties of TP-AGB stars expected in resolved stellar populations, especially in regard to their mean photometric properties from optical to mid-infrared wavelengths. We illustrate the expected numbers of TP-AGB stars of dfferent types in stellar populations covering a wide range of ages and initial metallicities, providing further details on the \C-star island" that appears at intermediate values of age and metallicity, and about the AGB-boosting eect that occurs at ages close to 1.6-Gyr for populations of all metallicities. The isochrones are available through a new dedicated web server.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11577/3214237
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