EVOLUTION, NUCLEOSYNTHESIS, AND YIELDS OF AGB STARS AT DIFFERENT METALLICITIES. III. INTERMEDIATE-MASS MODELS, REVISED LOW-MASS MODELS, AND THE pH-FRUITY INTERFACE

By S. Cristallo, O. Straniero, L. Piersanti, D. Gobrecht. 2015

230 citations recorded by the source corpus.

We present a new set of models for intermediate-mass asymptotic giant branch (AGB) stars (4.0, 5.0, and 6.0 M⊙) at different metallicities (−2.15 ≤ [Fe/H] ≤ +0.15). This set integrates the existing models for low-mass AGB stars (1.3 ≤ M/M⊙ ≤ 3.0) already included in the FRUITY database. We describe the physical and chemical evolution of the computed models from the main sequence up to the end of the AGB phase. Due to less efficient third dredge up episodes, models with large core masses show modest surface enhancements. This effect is due to the fact that the interpulse phases are short and, therefore, thermal pulses (TPs) are weak. Moreover, the high temperature at the base of the convective envelope prevents it from deeply penetrating the underlying radiative layers. Depending on the initial stellar mass, the heavy element nucleosynthesis is dominated by different neutron sources. In particular, the s-process distributions of the more massive models are dominated by the 22Ne(α,n)25Mg reaction, which is efficiently activated during TPs. At low metallicities, our models undergo hot bottom burning and hot third dredge up. We compare our theoretical final core masses to available white dwarf observations. Moreover, we quantify the influence intermediate-mass models have on the carbon star luminosity function. Finally, we present the upgrade of the FRUITY web interface, which now also includes the physical quantities of the TP-AGB phase for all of the models included in the database (ph-FRUITY).

Subfields: Astronomy and Astrophysics, Instrumentation, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/636606b2d348b16b981e1d3d27cbd6995822217f

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. A. Karakas
2. M. Lugaro
3. A. Chieffi
4. M. Limongi
5. C. Abia
6. S. Cristallo
7. N. Prantzos
8. J. Lattanzio

In Instrumentation

1. M. Lugaro
2. A. Karakas
3. S. Cristallo
4. C. Abia
5. A. Chieffi
6. M. Limongi
7. F. D’Antona
8. C. Kobayashi

In Statistical and Nonlinear Physics

1. M. Lugaro
2. S. Cristallo
3. C. Abia
4. A. Karakas
5. A. Chieffi
6. M. Limongi
7. C. Kobayashi
8. J. Lattanzio

Citations in the corpus

• Chemical evolution with rotating massive star yields - I. The solar neighbourhood and the s-process elements (2018, methodology): “Cristallo et al. (2009, 2011, 2015a) have constructed evolutionary stellar models coupled to a full nuclear network including all the relevant isotopes, up to the termination point of the s-process path (Pb-Bi).”
• STELLAR YIELDS FROM METAL-RICH ASYMPTOTIC GIANT BRANCH MODELS (2016, methodology): “9 from Cristallo et al. (2015) the peak HBB temperatures in their 6M , Z = 0.014, Z = 0.008 and Z = 0.006 models are log Tmaxbce /K ≈ 7.25, 7.35, and 7.45, respec- tively10.”