Some rapidly rotating cool stars and their activity

2008 ◽  
pp. 290-293 ◽  
Author(s):  
E. Budding ◽  
M. Zeilik
Keyword(s):  
Cool Stars

scholarly journals The chemistry of cool circumstellar envelopes

1987 ◽  
Vol 122 ◽  
pp. 551-552
Author(s):  
L.A.M. Nejad ◽  
T. J. Millar
Keyword(s):  
Kinetic Model ◽  
Chemical Kinetic ◽  
Time Dependent ◽  
Circumstellar Envelopes ◽  
Chemical Kinetic Model ◽  
Ion Molecule Reactions ◽  
Cool Stars

We have developed a time-dependent chemical kinetic model to describe the chemistry in the circumstellar envelopes of cool stars, with particular reference to IRC + 10216. Our detailed calculations show that ion-molecule reactions are important in the formation of many of the species observed in IRC + 10216.

scholarly journals Infrared Measurements of Stellar Magnetic Fields

1994 ◽  
Vol 154 ◽  
pp. 437-447 ◽  
Author(s):  
Steven H. Saar
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Pressure Support ◽  
Field Research ◽  
Future Directions ◽  
Rotation Rates ◽  
Infrared Measurements ◽  
Cool Stars ◽  
Rs Cvn Variables ◽  
Stellar Magnetic Fields

I review the advantages, techniques, and results of measurement of magnetic fields on cool stars in the infrared (IR). These measurements have generated several important results, including the following: the first data on the magnetic parameters of dMe and RS CVn variables; evidence for field strength confinement by photospheric gas pressure; support for the correlation between magnetic flux and rotation, with possible saturation at high rotation rates; indications of horizontal and/or vertical magnetic field structure; and evidence of spatial variations in B over a stellar surface. I discuss these results in detail, and suggest future directions for IR magnetic field research.

scholarly journals Observing Dynamos in Cool Stars

2014 ◽  
Vol 186 (1-4) ◽  
pp. 457-489 ◽  
Author(s):  
Z. Kővári ◽  
K. Oláh
Keyword(s):  
Cool Stars

Cool Stars

1971 ◽  
Vol 229 (5) ◽  
pp. 159-159
Author(s):  
ANNE B. UNDERHILL
Keyword(s):  
Cool Stars

scholarly journals Water in Sunspots and Stars

2002 ◽  
Vol 12 ◽  
pp. 70-72 ◽  
Author(s):  
Peter F. Bernath
Keyword(s):  
Water Vapor ◽  
Brown Dwarfs ◽  
Substellar Objects ◽  
Cool Stars

AbstractWater is found in a wide variety of cool stars and substellar objects such as brown dwarfs. The detection of water vapor in such objects is reviewed.

scholarly journals Density sensitive C II lines in cool stars of low gravity

1981 ◽  
Vol 196 (1) ◽  
pp. 47P-53P ◽  
Author(s):  
R. E. Stencel ◽  
J. L. Linsky ◽  
A. Brown ◽  
C. Jordan ◽  
K. G. Carpenter ◽  
...  
Keyword(s):  
Low Gravity ◽  
Cool Stars

scholarly journals ‘Negative’ surface differential rotation in stars having low Coriolis numbers (slow rotation or high turbulence)

2009 ◽  
Vol 5 (S264) ◽  
pp. 219-221 ◽  
Author(s):  
Kwing L. Chan
Keyword(s):  
Differential Rotation ◽  
Three Dimensional ◽  
Slow Rotation ◽  
General Picture ◽  
Cool Stars ◽  
Negative Surface ◽  
High Turbulence ◽  
The Mean ◽  
Key Parameter ◽  
Three Dimensional Simulations

AbstractA general picture of differential rotation in cool stars is that they are ‘solar-like’, with the equator spinning faster than the poles. Such surface differential rotation profiles have also been demonstrated by some three-dimensional simulations. In our numerical investigation of rotating convection (both regional and global), we found that this picture is not universally applicable. The equator may spin substantially slower than the poles (Ωequator − Ωpole)/Ω can reach −50%). The key parameter that determines the transition in behavior is the Coriolis number (inverse Rossby number). ‘Negative’ differential rotation of the equator (relative to the mean rotation) occurs if the Coriolis number is below a critical value.

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