Results 141 to 150 of about 302 (161)
Stellar Model Chromospheres and Spectroscopic Diagnostics
Annual Review of Astronomy and Astrophysics, 2017 The discovery of exoplanets and the desire to understand their atmospheric chemical composition and habitability provides a new rationale for understanding the radiation from X-rays to radio wavelengths emitted by their host stars. Semiempirical models of stellar atmospheres that include accurate treatment of radiative transfer of all important atoms ...
Jeffrey L Linsky
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Solar and stellar chromospheres
, 2005 This review attempts to highlight two fundamental and complementary aspects of the chromospheric phenomenon; viz., global properties of stellar chromospheres and their variation among the stars, and the underlying fine structure that affects or determines these global properties.
R Hammer, Hammer R
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Stellar chromospheres, coronae, and winds (invited review)
Astrophysics and Space Science, 1986 Within the last few years there have been important advances in our understanding of the chromospheres, coronae, and winds of late-type stars. This progress has been the result of ultraviolet and X-ray observations obtained from space with the International Ultraviolet Explorer andEinstein satellites. In addition, ground-based astronomy has contributed
Theodore Simon
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Stellar Chromospheres, Coronae, and Winds
, 1992 Chromospheres, coronae, and winds similar to those observed on the Sun have been detected in a variety of cool stars. In many cases, especially for main-sequence stars, there is good evidence that the processes leading to non-radiative plasma heating and wind acceleration are the same as for the Sun, although the radiative losses from stellar ...
R Pallavicini, Pallavicini R
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The present state of wave-heating theories of stellar chromospheres
Advances in Space Research, 1986 Abstract Observational constraints are summarized and the present state of the acoustic and mhd-wave heating theories for chromospheres in early and late-type stars are discussed. It is found that the slow-mode mhd-wave heating theory looks most promising but that mode-coupling from transverse or torsional Alfven waves may be significant for the ...
P Ulmschneider
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Science, 1966 Besides being of intrinsic interest, these outer stellar envelopes provide very useful astrophysical ...
O C Wilson
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A phenomenological interpretation of stellar chromospheres
Astrophysics and Space Science, 1986An attempt is made to develop a phenomenological interpretation of stellar chromospheres. The following problems are examined: observed emission powers of ‘magnesium’ chromospheres on stars based on the ultraviolet doublet, 2800 Mgii, observations; dependence of chromosphere emission on spectral and luminosity classes; stellar chromospheres as an ...
G A Gurzadyan, Gurzadyan G A
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Thermal instability and the convective stability of stellar chromospheres [PDF]
, 1970 It is generally believed that stellar chromospheres are stable against convection since the Schwarzschild criterion indicates stability when temperature increases with height. It is shown, however, that the Schwarzschild criterion does not apply to chromospheres because it ignores the possibility of thermal instability.
Defouw, Richard John
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Stellar rotation as a controller of coronae and chromospheres of giant stars
Publications of the Astronomical Society of the Pacific, 1983The flux of X-ray emission from F, G, and K giants drops abruptly at G5 III. This mimics the drop in rotation rates of giant seen previously. The X-ray flux, when normalized to the bolometric flux, varies as the square of the equatorial surface rotatin velocity.
D F Gray
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