Open Astronomy, 2011 The chemi-ionization processes in atom - Rydberg atom collisions, as well as the corresponding chemi-recombination processes, are considered as factors of influence on the atom exited-state populations in weakly ionized layers of stellar atmospheres. The
Mihajlov Anatolij A. +3 more
doaj +1 more source
Stellar fluxes as probes of convection in stellar atmospheres [PDF]
Proceedings of the International Astronomical Union, 2006 AbstractConvection and turbulence in stellar atmospheres have a significant effect on the emergent flux from late-type stars. The theoretical advancements in convection modelling over recent years have proved challenging for the observers to obtain measurements with sufficient precision and accuracy to allow discrimination between the various ...
openaire +4 more sources
Limb Darkening and Planetary Transits: Testing Center-to-limb Intensity Variations and Limb-darkening Directly from Model Stellar Atmospheres [PDF]
, 2017 The transit method, employed by Microvariability and Oscillation of Stars (MOST), Kepler, and various ground-based surveys has enabled the characterization of extrasolar planets to unprecedented precision.
H. Neilson +3 more
semanticscholar +1 more source
The effect of stellar contamination on low-resolution transmission spectroscopy: Needs identified by NASA’s Exoplanet Exploration Program Study Analysis Group 21 [PDF]
RAS Techniques and Instruments, 2022 Study Analysis Group 21 (SAG21) of NASA’s Exoplanet Exploration Program Analysis Group (ExoPAG) was organized to study the effect of stellar contamination on space-based transmission spectroscopy, a method for studying exoplanetary atmospheres by ...
B. Rackham +60 more
semanticscholar +1 more source
New Methods in Modeling of Hot Stellar Atmospheres
Open Astronomy, 2013 In the present study we had three main aims. First to study the possibility of reducing the initial model atmosphere data to short analytical polynomials.
Sapar A., Poolamäe R., Sapar L.
doaj +1 more source
The True Nature of the Brightest Local Triple Stellar Candidates within 100 pc in the Galaxy
The Astronomical Journal, 2023 We present a study of a sample of bright ( V ≤ 10 mag) and close ( d ≤ 100 pc) triple–stellar system candidates in the galaxy, consisting of eight systems in total.
Z. T. Yousef +3 more
doaj +1 more source
Lithium in Stellar Atmospheres: Observations and Theory [PDF]
, 2016 Of all the light elements, lithium is the most sensitive indicator of stellar evolution. This review discusses current data on the abundance of lithium in the atmospheres of A-, F-, G-, and K-stars of different types, as well as the consistency of these ...
L. S. Lyubimkov
semanticscholar +1 more source
Technetium in Stellar Atmospheres [PDF]
Symposium - International Astronomical Union, 1991 The quantitative determinations of technetium abundances are discussed. Up to now Tc abundances were found for nearly 30 stars which all are thermally pulsing AGB stars. The technetium abundance values for these AGB stars atmospheres, where it was found to be present, cluster around −1.0 ÷ 1.7.
openaire +2 more sources
Simulation of the small-scale magnetism in main-sequence stellar atmospheres
Astronomy & Astrophysics, 2018 Context. Observations of the Sun tell us that its granular and subgranular small-scale magnetism has significant consequences for global quantities such as the total solar irradiance or convective blueshift of spectral lines. Aims.
R. Salhab +5 more
semanticscholar +1 more source
Mg line formation in late-type stellar atmospheres - I. The model atom [PDF]
, 2015 Context. Magnesium is an element of significant astrophysical importance, often traced in late-type stars using lines of neutral magnesium, which is expected to be subject to departures from local thermodynamic equilibrium (LTE).
Y. Osorio +8 more
semanticscholar +1 more source