dc.contributor.author |
Rajaguru, S. P |
|
dc.contributor.author |
Hasan, S. S |
|
dc.date.accessioned |
2012-02-24T14:06:04Z |
|
dc.date.available |
2012-02-24T14:06:04Z |
|
dc.date.issued |
2011-08 |
|
dc.identifier.citation |
The Physics of Sun and Star Spots, Proceedings of the International Astronomical Union, IAU Symposium, Vol. 273, pp. 276-280 |
en |
dc.identifier.uri |
http://hdl.handle.net/2248/5704 |
|
dc.description |
Open Access |
en |
dc.description.abstract |
Temperature contrasts and magnetic field strengths of sunspot umbrae broadly follow the thermal-magnetic relationship obtained from magnetohydrostatic equilibrium. Using a compilation of recent observations, especially in molecular bands, of temperature contrasts of starspots in cool stars, and a grid of Kurucz stellar model atmospheres constructed to cover layers of sub-surface convection zone, we examine how the above relationship scales with effective temperature (Teff), surface gravity g and the associated changes in opacity of stellar photospheric gas. We calculate expected field strengths in starpots and find that a given relative reduction in temperatures (or the same darkness contrasts) yield increasing field strengths against decreasing Teff due to a combination of pressure and opacity variations against Teff. |
en |
dc.language.iso |
en |
en |
dc.publisher |
Cambridge University Press |
en |
dc.relation.ispartofseries |
International Astronomical Union Symposium; No. 273 |
|
dc.relation.uri |
http://dx.doi.org/10.1017/S1743921311015377 |
en |
dc.rights |
© International Astronomical Union |
en |
dc.subject |
Sun: magnetic fields |
en |
dc.subject |
Sunspots; stars |
en |
dc.subject |
Magnetic fields |
en |
dc.subject |
Stars: spots |
en |
dc.subject |
Stars: activity |
en |
dc.title |
Magnetohydrostatic equilibrium in starspots: dependences on color (Teff) and surface gravity (g) |
en |
dc.type |
Article |
en |