Conveners
Stellar Evolutions and Hydrostatic Burning Processes
- There are no conveners in this block
Stellar Evolutions and Hydrostatic Burning Processes
- Nan Liu (Boston University)
Stellar Evolutions and Hydrostatic Burning Processes
- There are no conveners in this block
Stellar Evolutions and Hydrostatic Burning Processes
- There are no conveners in this block
Stellar Evolutions and Hydrostatic Burning Processes
- There are no conveners in this block
Stellar Evolutions and Hydrostatic Burning Processes
- Christopher Wrede (Michigan State University and Facility for Rare Isotope Beams)
$\rm ^7Be$ plays an important role in several astrophysical scenarios. In stellar hydrogen burning, the competition of its proton and electron captures determines the high-energy component of the solar neutrino spectrum. In BBN, its ultimate abundance determines the amount of $\rm ^7Li$ observed in primordial matter. Its $\rm ^3He(^4He,\gamma)^7Be$ and $\rm ^7Be(p,\gamma)^8B$ production and...
The $^{12}$C+$^{12}$C fusion reaction plays a pivotal role in the process of stellar evolution. Despite six decades of studies, there is still a large uncertainty in the reaction rate which limits our understanding of various stellar objects, such as massive stars, type Ia supernovae, and superbursts. In this talk, I will review the experimental and theoretical studies of the carbon fusion...
Neutron production for the slow neutron capture process ($s$-process) is dominated by $(\alpha,n)$ reactions on light nuclei during stellar helium burning. The two most prominent are $^{13}$C$(\alpha,n)^{16}$O and $^{22}$Ne$(\alpha,n)^{25}$Mg. New measurements of the angle integrated cross section have recently been reported by both the LUNA and JUNA underground facilities, reaching to...
Carbon-oxygen (C-O) shell interactions in the late evolutionary stages of massive stars play a crucial role in determining their final fate and have a significant impact on the pre-supernova and explosive nucleosynthesis. In this talk, I will explore the complex dynamics within C-O shells, and how these interactions drive the production of intermediate and heavy elements. Recent advancements...
Binary stars lie at the heart of many vital astrophysical phenomena, and several types of explosive cosmic events are produced by binary objects, such as double black holes, double neutron stars, double white dwarfs, type Ia supernovae, and X-ray binaries. Despite the importance of binary evolution, there are still two long-standing unsolved fundamental questions: mass transfer stability and...
The gravitational wave signal GW190521 detected by LIGO/Virgo seems to originate from a binary black hole merger event, with a 99.0% probability that at least one of the black holes falls into the black hole mass gap caused by pair-instability supernova. This conclusion challenges stellar evolution theory and has motivated many attempts to examine the effects of uncertainties involved in...
Very massive stars (VMS) just like massive stars, have great impact on their enviroment and cosmic evolution. Low metallicity VMS models are highly sensitive to rotation, while the evolution of higher metallicity models is dominated by mass loss effects. In this talk, I will explore the impact of low metallicty VMS models using GENEC and how does their evolution and their predicted fate will...
Stellar helium content is one of the most important but mysterious factors that play an essential role in the evolution of our Universe. As the main product of the stellar nucleosynthesis process, helium produced by stars serves as the raw material for the next generation of stars. Stars with enriched helium are known to be hotter, brighter, and evolve faster; thus, our estimation of stellar...
Li, being susceptible to high temperature, expected to deplete below 1.5 dex in low mass (M < 2 solar mass) evolved stars. Still 1% of red giants are discovered with Li abundance 4-5 order more than expected value. To understand this anomaly, we used data from LAMOST spectroscopic survey, photometric survey of Kepler space telescope, and Gaia astrometry. Our work discovered several red clump...
I will introduce the current status of the solar models. The current standard solar model is not consistent with observations of helioseismology and the solar neutrinos. I will introduce possible mechanisms for improving the solar model, including changing the standard input physics (such as opacity and diffusion) and considering the effects of non-standard physical processes (such as...
