Results 1 to 10 of about 11,210,903 (298)

Realistic Uncertainties for Fundamental Properties of Asteroseismic Red Giants and the Interplay between Mixing Length, Metallicity, and

The Astrophysical Journal
Asteroseismic modeling is a powerful way to derive stellar properties. However, the derived quantities are limited by built-in assumptions used in stellar models.
Yaguang Li, Timothy R. Bedding, Daniel Huber, Dennis Stello, Jennifer van Saders, Yixiao Zhou, Courtney L. Crawford, Meridith Joyce, Tanda Li, Simon J. Murphy, K. R. Sreenivas   +10 more
doaj   +1 more source

Low-mass stars: Open problems all along their evolution

EPJ Web of Conferences, 2013
Although low-mass stars have a comparatively simple structure, current stellar models are far from reproducing them accurately. In light of the observational progress, in particular of asteroseismology, the deficits of the theory of stellar structure and
Heners N., Weiss A.
doaj   +1 more source

S-process in low-mass extremely metal-poor stars

EPJ Web of Conferences, 2012
We present post-processing s-process calculations for the core He-flash of a 1M☉ star with and Z = 10−8. Our model shows neutron densities larger than 1014cm−3, resulting in the production of s-process elements. The model reproduces the C, O, Sr, and Ba
Weiss A., Serenelli A., Cruz M.A.
doaj   +1 more source

The Variation in the Galaxy-wide Initial Mass Function for Low-mass Stars: Modeling and Observational Insights

The Astrophysical Journal
The stellar initial mass function (IMF) characterizes the mass distribution of newly formed stars in various cosmic environments, serving as a fundamental assumption in astrophysical research. Recent findings challenge the prevalent notion of a universal
Zhiqiang Yan, Jiadong Li, Pavel Kroupa, Tereza Jerabkova, Eda Gjergo, Zhi-Yu Zhang   +5 more
doaj   +1 more source

Digging into the Interior of Hot Cores with ALMA (DIHCA). VI. The Formation of Low-mass Multiple Systems in High-mass Cluster-forming Regions

The Astrophysical Journal
Most stars form in multiple systems, with profound implications in numerous astronomical phenomena intrinsically linked to multiplicity. However, our knowledge about the process of how multiple stellar systems form is incomplete and biased toward nearby ...
Qiu-yi Luo, Patricio Sanhueza, Stella S. R. Offner, Fernando Olguin, Adam Ginsburg, Fumitaka Nakamura, Kaho Morii, Yu Cheng, Kei E. I. Tanaka, Junhao Liu, Tie Liu, Xing Lu, Qizhou Zhang, Kotomi Taniguchi, Piyali Saha, Shanghuo Li, Xiaofeng Mai   +16 more
doaj   +1 more source

High-resolution Elemental Abundance Measurements of Cool JWST Planet Hosts Using AutoSpecFit: An Application to the Sub-Neptune K2-18b’s Host M Dwarf

The Astrophysical Journal
We present an in-depth, high-resolution spectroscopic analysis of the M dwarf K2-18, which hosts a sub-Neptune exoplanet in its habitable zone. We show our technique to accurately normalize the observed spectrum, which is crucial for a proper spectral ...
Neda Hejazi, Ian J. M. Crossfield, Diogo Souto, Jonathan Brande, Thomas Nordlander, Emilio Marfil, Katia Cunha, David R. Coria, Zachary G. Maas, Alex S. Polanski, Natalie R. Hinkel, Joseph E. Hand   +11 more
doaj   +1 more source

The CHARA Array Interferometric Program on the Multiplicity of Classical Be Stars: New Detections and Orbits of Stripped Subdwarf Companions

The Astrophysical Journal
Rapid rotation and nonradial pulsations enable Be stars to build decretion disks, where the characteristic line emission forms. A major but unconstrained fraction of Be stars owe their rapid rotation to mass and angular momentum transfer in a binary. The
Robert Klement, Thomas Rivinius, Douglas R. Gies, Dietrich Baade, Antoine Mérand, John D. Monnier, Gail H. Schaefer, Cyprien Lanthermann, Narsireddy Anugu, Stefan Kraus, Tyler Gardner   +10 more
doaj   +1 more source

Linearity of Structure Kernels in Main-sequence and Subgiant Solar-like Oscillators

The Astrophysical Journal
Seismic structure inversions have been used to study the solar interior for decades. With the high-precision frequencies obtained using data from the Kepler mission, it has now become possible to study other solar-like oscillators using structure ...
Lynn Buchele, Earl P. Bellinger, Saskia Hekker, Sarbani Basu   +3 more
doaj   +1 more source

Marginally Stable Nuclear Burning Triggered at Different Depths of the Neutron Star Surface in Low-mass X-Ray Binary 4U 1608-52

The Astrophysical Journal
We investigated the timing and spectral properties of the millihertz quasiperiodic oscillations (mHz QPOs) in the neutron star low-mass X-ray binary 4U 1608–52 using NICER observations. Our analysis reveals a correlation between the QPO frequency and its
Ming Lyu, Guobao Zhang, Mariano Méndez, Huaping Xiao   +3 more
doaj   +1 more source

Disk Lifetime Distribution as a Function of the Mass of Host Star

The Astrophysical Journal
The lifetime of protoplanetary disks is a critical factor for planet formation. Although the mean disk lifetime provides an estimate of the typical period available for planet formation, it does not capture the substantial variability in individual disk ...
Susanne Pfalzner, Furkan Dincer, Nienke van der Marel, Frank W. Wagner   +3 more
doaj   +1 more source