Modules for Experiments in Stellar Astrophysics (MESA): Time-dependent Convection, Energy Conservation, Automatic Differentiation, and Infrastructure [PDF]
Astrophysical Journal Supplement Series, 2022 We update the capabilities of the open-knowledge software instrument Modules for Experiments in Stellar Astrophysics (MESA). The new auto_diff module implements automatic differentiation in MESA, an enabling capability that alleviates the need for hard ...
A. Jermyn +21 more
semanticscholar +1 more source
Non-Thermal Nitric Oxide Formation in the Earth’s Polar Atmosphere
Atmosphere, 2023 Auroral events are the prominent manifestation of solar/stellar forcing on planetary atmospheres because they are closely related to the stellar energy deposition by and evolution of planetary atmospheres.
Valery Shematovich +2 more
doaj +1 more source
Nonthermal Motions and Atmospheric Heating of Cool Stars
The Astrophysical Journal, 2023 The magnetic processes associated with the nonthermal broadening of optically thin emission lines appear to carry enough energy to heat the corona and accelerate the solar wind.
S. Boro Saikia +8 more
doaj +1 more source
A new extensive library of PHOENIX stellar atmospheres and synthetic spectra [PDF]
, 2013 Aims. We present a new library of high-resolution synthetic spectra based on the stellar atmosphere code PHOENIX that can be used for a wide range of applications of spectral analysis and stellar parameter synthesis. Methods.
T. Husser +6 more
semanticscholar +1 more source
FastChem: A computer program for efficient complex chemical equilibrium calculations in the neutral/ionized gas phase with applications to stellar and planetary atmospheres [PDF]
Monthly notices of the Royal Astronomical Society, 2018 For the calculation of complex neutral/ionized gas-phase chemical equilibria, we present a semi-analytical, versatile, and efficient computer program, called FastChem.
Xuan Fang +10 more
semanticscholar +1 more source
Intriguing Revelations from Lithium, Beryllium, and Boron
The Astrophysical Journal, 2023 This is a report on some highlights of research on the rare light elements, lithium (Li), beryllium (Be), and boron (B), that were presented at my Henry Norris Russell Lecture in 2020 January.
Ann Merchant Boesgaard
doaj +1 more source
MESAS: Measuring the Emission of Stellar Atmospheres at Submillimeter/millimeter Wavelengths [PDF]
Astrophysical Journal, 2018 In the early stages of planet formation, small dust grains grow to become millimeter-sized particles in debris disks around stars. These disks can in principle be characterized by their emission at submillimeter and millimeter wavelengths.
J. White +6 more
semanticscholar +1 more source
Mechanism for flow generation/acceleration in dense degenerate stellar atmospheres [PDF]
, 2017 The mechanism for flow generation in dense degenerate stellar atmospheres is suggested when the electron gas is degenerate and ions are assumed to be classical.
A. Barnaveli, N. Shatashvili
semanticscholar +1 more source
Investigation of ρ Cas (HR 9045, HD 224014) stellar atmosphere [PDF]
Serbian Astronomical JournalThe atmosphere of hypergiant ρ Cas is investigated by the method of atmospheric model. Effective temperature and the surface of gravity are determined by comparing the observed and theoretical values of photometrical indices [c1];Q, and ...
Samedov Z.A., Hajieva G.M.
doaj +1 more source
Lithium in Turnoff Stars in the Globular Cluster M5: A Quest for Primordial Lithium
The Astrophysical Journal, 2023 The light element lithium is formed by nucleosynthesis during the Big Bang. Its abundance can help to define the parameters of the early Universe. To find this primordial value, it is necessary to determine Li abundances in the oldest stars because it is
Ann Merchant Boesgaard +1 more
doaj +1 more source