The Astrophysical Journal, 2023 Previous examinations of fully convective M-dwarf stars have highlighted enhanced rates of nanoflare activity on these distant stellar sources. However, the specific role the convective boundary, which is believed to be present for spectral types earlier
S. D. T. Grant +13 more
doaj +1 more source
Effect of stellar flares on the upper atmospheres of HD 189733b and HD 209458b [PDF]
, 2017 Stellar flares are a frequent occurrence on young low-mass stars around which many detected exoplanets orbit. Flares are energetic, impulsive events, and their impact on exoplanetary atmospheres needs to be taken into account when interpreting transit ...
J. Chadney +5 more
semanticscholar +1 more source
Radiative Transfer in Stellar Atmospheres [PDF]
EAS Publications Series, 2010 This review presents basic equations for the solution of the NLTE radiative transfer problem for trace elements and methods for its solution are summarized. The importance of frequency coupling in radiative transfer in stellar atmospheres is emphasized.
openaire +3 more sources
Scaling of the asymptotic entropy jump in the superadiabatic layers of stellar atmospheres [PDF]
, 2016 Stellar structure calculations are able to predict precisely the properties of stars during their evolution. However, convection is still modelled by the mixing length theory; therefore, the upper boundary conditions near the optical surface do not agree
Z. Magic
semanticscholar +1 more source
The Stellar Activity of TRAPPIST-1 and Consequences for the Planetary Atmospheres [PDF]
, 2017 The signatures of planets hosted by M dwarfs are more readily detected with transit photometry and radial velocity methods than those of planets around larger stars.
R. Roettenbacher, S. Kane
semanticscholar +1 more source
EXOPLINES: Molecular Absorption Cross-section Database for Brown Dwarf and Giant Exoplanet Atmospheres [PDF]
Astrophysical Journal Supplement Series, 2021 Stellar, substellar, and planetary atmosphere models are all highly sensitive to the input opacities. Generational differences between various state-of-the-art stellar/planetary models arise primarily because of incomplete and outdated atomic/molecular ...
E. Gharib-Nezhad +5 more
semanticscholar +1 more source
2D MODELLING OF THE GAS FLOW STRUCTURE IN THE SYMBIOTIC STAR Z ANDROMEDAE
Odessa Astronomical Publications, 2017 The 2D gasdynamical simulations of gas structure in the symbiotic star Z And have been carried out for different stellar wind regimes. Since the mechanisms of gas acceleration in stellar atmospheres are not well studied, the parametric representation of ...
E. Yu. Kilpio
doaj +1 more source
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
Synthetic photometry for M and K giants and stellar evolution: hydrostatic dust-free model atmospheres and chemical abundances [PDF]
, 2016 Based on a grid of hydrostatic spherical COMARCS models for cool stars, we have calculated observable properties of these objects, which will be mainly used in combination with stellar evolution tracks and population synthesis tools.
B. Aringer +4 more
semanticscholar +1 more source
Ca line formation in late-type stellar atmospheres [PDF]
Astronomy & Astrophysics, 2015 Context. Departures from local thermodynamic equilibrium (LTE) distort the calcium abundance derived from stellar spectra in various ways, depending on the lines used and the stellar atmospheric parameters.
Y. Osorio +8 more
semanticscholar +1 more source