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http://hdl.handle.net/2248/5704
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DC Field | Value | Language |
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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 |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Magnetohydrostatic equilibrium in starspots.pdf | Open Access | 234.3 kB | Adobe PDF | ![]() View/Open |
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