Stellar magnetic fields: From the photosphere into the corona

Details Stellar magnetic fields: From the photosphere into the corona Stellar magnetic fields: From the photosphere into the corona

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop...39l&link_type=abstract

XMM-Newton Proposal ID #05511201

Physics

Stars, White Dwarfs, Solar System, Proxima Cen, Xmm-Newton Proposal Id #05511201

Scientific paper

Simultaneous X-ray and optical observations of the active M dwarf CN Leo have shown variability in its magnetic flux (as measured through magnetically sensitive lines in the molecular FeH band) on different timescales: within a few days, within one night, and possibly even related to a flare event. We propose to extend these studies to a larger sample of stars and observe the two flare stars Proxima Cen and YZ CMi simultaneously with XMM-Newton and VLT/UVES in order to characterize the amplitudes and time scales of variations in their photospheric magnetic fields together with the behavior of chromospheric emission lines and coronal X-ray emission. This will enable us to trace activity-related changes in the stellar magnetic field through all layers of the stellar atmosphere.

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