Results 61 to 70 of about 882,024 (358)
Radiation Hydrodynamics of Line-Driven Winds [PDF]
, 2009 Dimtri Mihalas' textbooks in the 70's and 80's on "Stellar Atmospheres" and "Foundations of Radiation Hydrodynamics" helped lay the early groundwork for understanding the moving atmospheres and winds of massive, luminous stars.
Ivan Hubeny +4 more
core +3 more sources
Living with a Red Dwarf: X-Ray, UV, and Ca ii Activity–Age Relationships of M Dwarfs
The Astrophysical Journal, 2023 The vast majority of stars in the nearby stellar neighborhood are M dwarfs. Their low masses and luminosities result in slow rates of nuclear evolution and minimal changes to the stars’ observable properties, even along astronomical timescales.
Scott G. Engle
doaj +1 more source
On line contribution functions and examining spectral line formation in 3D model stellar atmospheres [PDF]
, 2015 Line contribution functions are useful diagnostics for studying spectral line formation in stellar atmospheres. I derive an expression for the contribution function to the abso- lute flux depression that emerges from three-dimensional box-in-a-star model
A. Amarsi
semanticscholar +1 more source
The Astrophysical Journal Letters, 2023 JWST secondary eclipse observations of Trappist-1b seemingly disfavor atmospheres >∼1 bar since heat redistribution is expected to yield dayside emission temperature below the ∼500 K observed.
Joshua Krissansen-Totton
doaj +1 more source
, 2014 Basic assumptions of the NLTE approximation in stellar atmospheres are summarized. The assumptions of thermodynamic equilibrium, local thermodynamic equilibrium (LTE), and non-LTE (NLTE) are compared.
Kubát, Jiří
core +1 more source
Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) [PDF]
Astronomy & Astrophysics, 2020 Ultra-hot Jupiters offer interesting prospects for expanding our theories on dynamical evolution and the properties of extremely irradiated atmospheres.
V. Bourrier +23 more
semanticscholar +1 more source
An intracellular transporter mitigates the CO2‐induced decline in iron content in Arabidopsis shoots
FEBS Letters, EarlyView.This study identifies a gene encoding a transmembrane protein, MIC, which contributes to the reduction of shoot Fe content observed in plants under elevated CO2. MIC is a putative Fe transporter localized to the Golgi and endosomal compartments. Its post‐translational regulation in roots may represent a potential target for improving plant nutrition ...
Timothy Mozzanino +7 more
wiley +1 more source
Stark broadening parameter tables for neutral calcium spectral lines. I [PDF]
Serbian Astronomical Journal, 1999 Using a semiclassical approach, we have calculated electron−, proton−, He II−, Mg II-, Si II- and Fe II-impact line widths and shifts for 189 Ca I multiplets as a function of temperature.
Dimitrijević M.S., Sahal−Bréchot S.
doaj +1 more source
Indicators of Mass in Spherical Stellar Atmospheres
, 2013 Mass is the most important stellar parameter, but it is not directly observable for a single star. Spherical model stellar atmospheres are explicitly characterized by their luminosity ($L_\star$), mass ($M_\star$) and radius ($R_\star$), and observations
Dinshaw, Rayomond +2 more
core +1 more source
The Solar--Stellar Connection [PDF]
, 2004 Stars have proven to be surprisingly prolific radio sources and the added sensitivity of the Square Kilometer Array will lead to advances in many directions.
Anglada +42 more
core +2 more sources