Cartography of the Sun and the Stars
Jean-Pierre Rozelot, Coralie Neiner
Springer, Mar 11, 2016 - Science - 206 pages
The mapping of the surface of stars requires diverse skills, analysis techniques and advanced modeling, i.e. the collaboration of scientists in various specialties. This volume gives insights into new techniques allowing for the first time to obtain resolved images of stars. It takes stock of what has been achieved so far in Chile, on the ESO VLTI instrument or, in the States, on the CHARA instrument.
In recent times interferometry, combined with adaptive optics has allowed to reconstruct images of stars. Besides the Sun (of course) by now five stars have been resolved in detail. In addition to interferometry, this book highlights techniques used for mapping the surfaces of stars using photometry made by space observatories; Zeeman- and Doppler Imaging; mapping the surface element abundances via spectroscopy. This book will also take stock of the best images of the solar surface, made by connecting the differential rotation to the underlying physical parameters derived from helioseismology. Recent measurements of flattening of the solar surface by SDO showed that the Sun’s shape is linked to the rotation of the core. It is shown how such a result is generalizable to the stars.
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2 Reconstruction of Solar Subsurfaces by Local Helioseismology
3 Imaging Surface Spots from SpaceBorne Photometry
4 Reconstruction of Thermal and Magnetic Field Structure of the Solar Subsurface Through Helioseismology
The Case of Rotation
Application to Achernar
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Achernar active regions active stars algorithm amplitude Ap stars apertures Astronomy & Astrophysics Astronomy and Astrophysics Astrophysical Journal baselines chemical closure phases components convection zone convective envelope differential rotation distribution Domiciano de Souza dynamo effective temperature equation equatorial Espinosa Lara evolution faculae flow maps flux Fourier function gravity darkening helioseismology Hiremath image reconstruction interferometer inversion iterative Kervella Kochukhov Kosovichev Lanza Lara and Rieutord light curve line profile longitude magnetic field structure measured meridional meridional flows modes modulation neutrino noise observations obtained optical oscillations parameters photometry photosphere PIONIER plane polar polarisation poloidal problem radiative regularization rotating stars Rozelot solar cycle solar interior solar model Solar Physics solution sound speed spatial frequencies spectral spot modelling standard solar model starspot stellar rotation stellar surface Stokes Stokes parameter Sun’s sunspot techniques telescopes toroidal magnetic field variations vector visibility wavelength Zeipel